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Our Terms & Conditions

Please review the following prior to works being undertaken.

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Please read our terms on conditions prior to works being undertaken.
If you aren’t sure or need further clarification then please call us on 020 8935 51560


All quotes are valid for a maximum of 30 days, following this period costs may increase/decrease.

Job Instruction

Upon acceptance of our quote and instruction of our services, you will be required to complete an online form to clarify invoice payer details. This must be submitted to us before we can confirm your booking and commence works.

If you are not the bill payer, the relevant option on the form must be selected and the correct payer details submitted. Failure to complete the payer information will result in you becoming liable for the invoice.

Job Cancellation Fees

  • Same Day Cancellation Fee
    • If a survey has been cancelled or postponed on the day of the survey, a fee of 35% of the quotation value or £550+VAT (whichever is greater) will apply.
  • Day Before Cancellation Fee
    • Surveys that are cancelled by the client on the day before the scheduled arrival will be subject to a 20% fee of the full quote cost or £300+VAT (whichever is greater).

Invoice Terms

  • Commercial Clients
    • Following the issue of drawings/survey results, payments are to be strictly within 30 days of the invoice date.
  • Non-Commercial Clients
    • Following the issue of drawings/survey results, payments are to be strictly within 14 days of the invoice date.

VAT Reverse Charge

We are not eligible for the VAT reverse charge as we fall into the category of “Surveyors” which are not part of the scheme. Please review the following document from the Government.

Overdue Invoices

We reserve the right to charge statutory interest on all debts that exceed our invoice due date.

The current rate set by the Government at 8% + the Bank of England base rate on a per annum basis. In addition, we also reserve the right to charge debt recovery costs as set out by Government guidelines.

Issuing Drawings to Commercial Clients

For first-time commercial clients, at the point of drawing completion, watermarked PDF files will be issued via email along with an invoice for the works. Once this invoice has been paid, final copies of the associated drawings in PDF and DWG (CAD) format will be provided via email.

For existing commercial clients, if no previous invoices are overdue by more than 14 days, final copies of the drawings in PDF and DWG (CAD) format will be provided via email at the point of completion.

If existing clients have previous invoices overdue by more than 14 days, watermarked PDF files will be issued via email along with an invoice for the works. DWG (CAD) and final PDF files will only be issued once the account is up to date.

Issuing Drawings to Non-Commercial Clients

At the point of drawing completion, watermarked PDF files will be issued via email along with an invoice for the works. Once this invoice has been paid, final copies of the associated drawings in PDF and DWG (CAD) format will be provided via email.


THS Concepts retain the ownership of any drawings, CAD files and data until the invoice is settled in full.


If you aren’t satisfied with our drawing or survey work please notify us in writing clearly stating any issues within 30 days of receiving the drawings. We reserve the right to rectify any erroneous or missing data/information either by re-visiting the site or amending drawings. Please note we cannot issue any refunds after the 30-day limit has elapsed.

Standing Time

We will price in sufficient time on site for elements such as inductions, discussing drawings and other general arrangements. If THS Concepts are prevented from working for reasons that we could not have factored in such as delays / stoppages by the client then we charge a fee of £55/hour + VAT per Surveyor that is on site.

Adverse Weather Conditions

For adverse weather conditions such as high winds, heavy rain, snow or thunderstorms, we reserve the right to reschedule the survey date for the client free of charge. Working outdoors in adverse weather conditions can be dangerous, cause damage to equipment and result in survey inaccuracies.


We will not survey areas where unsecured large animals are present. For example, fields with horses, cows, bulls, goats etc. For domesticated animals we won’t survey areas where our Surveyors deem the animals to be a risk to their personal safety.

Anti-Social Behaviour

THS Concepts reserve the right to remove ourselves from surveys in which we feel unsafe, uncomfortable or disrespected. Rudeness from clients will not be tolerated and our staff may decide to leave the premises if this occurs and is not dealt with instantly. In this instance you will be liable to pay our same day cancellation fee and we may refuse to re-visit and complete the required works.

In situations where we feel our staff are likely to be physically harmed or harassed, we will leave the survey site immediately.

It must be disclosed to us prior to undertaking any survey works if you feel there is an immediate threat to our personal wellbeing. Examples of this include high rates of targeted crime and any likely aggressive interrogation or abuse from others (neighbours, tenants etc.).


If there is a presence of asbestos, or suspected presence, this must be adequately communicated to THS Concepts. If we have to withdraw from site as a result of this a same day cancellation charge will apply.

Broken or Steep Ground

Where the ground is particularly steep or broken it may not be possible to safely survey without causing potential injuries. You must let us know if such a problem could affect our ability to undertake the required survey work.

Confined Spaces

THS Concepts will not survey in any confined space without prior discussion with the client. Please make us aware of any areas that require confined space surveying.

Dangerous Structures

We will not survey in dangerous or structurally unsound structures. It is at our Surveyors discretion to define as to when a structure is in a dangerous condition. Examples of dangerous structures include holes in the floor, dilapidated structures, burnt out structure etc.

Animal Waste & Vermin

Where the is a large build-up of animal droppings/waste or a presence of vermin on site, due to health risks no survey work will be undertaken until this has been cleared by an approved contractor. If we have to withdraw from site as a result of this a same day cancellation charge will apply.

General Survey Access

We do not undertake any site clearance so please ensure areas that need surveying are clear of debris, dense vegetation and obstructing items.

Hypodermic Needles/Paraphernalia

In areas where needles or drugs paraphernalia is present THS Concepts will not survey until a suitable contractor has cleared the area.


We will assume that there is adequate lighting to allow our Surveyors to undertake their work safely. Our Surveyors will be equipped with head torches suitable for lighting up small rooms and areas.

If larger areas need to be lit, we need to be told prior to arrival. It may require additional costs to provide adequate lighting. If we arrive and have not been told about inadequate lighting, we may need to charge a same day cancellation fee.

Overgrown Areas

In areas of dense vegetation THS Concepts will endeavour to survey as much information as possible. However, it may mean that no or very little information can be picked up in these areas without clearance by the client. If we have to withdraw from site as a result of this, a same day cancellation charge will apply.

Site Working Hours

It is assumed that we can survey, without interruption, between the hours of 08:00 and 17:30. We will give the client an indication of how long the survey will take. If we are asked to leave prior to this, it may incur a day cancellation charge.

Theft of Equipment

Our instruments and equipment are valuable, and it is therefore important that it is protected from theft. It is the responsibility of our clients to ensure we can operate in a safe and protected environment whilst on their property or within a designated site. This includes the securing of property from trespassers, ensuring there are no unauthorised persons present (squatters etc) and safeguarding our equipment from other workers, residents or visitors.

In situations where we feel our equipment is at high risk of being damaged or stolen, we will leave the survey site immediately.

Working at Height

Where a survey is required on a flat roof or above ground level, it is assumed that there is suitable safe access. Suitable access will be provided by stairs or ladders that are deemed to be in good working condition.

If we need to bring a ladder to site this should be brought to our attention at least 1 day prior to our arrival. It may require additional costs to provide this.


Please note that provisional/suggested time frames are based on typical survey and draughting times. In some instances, we may exceed our provisional return date and we will notify you if this is the case. If you have not received the drawings or data by the expected return date, please notify us as it is possible our drawing/data issue email may not have made it to you.

We can only issue CAD-compatible files in DWG format. Printable drawings are issued in PDF format. All digital drawings and data will be issued via email to the initial client. Photographs are offered as a chargeable optional extra and will be issued via a third-party online cloud/file storage provider. If you require photographs this must be requested at the time of instruction.

We can post printed drawings to you at your request, but only in A4 & A3 sizes. We cannot print and post drawings at A2, A1, A0 or larger page sizes. Please note that we may print A0, A1 & A2 drawings on to an A3 sheet so bare this in mind as it will not be to scale. If you require printed copies please let us know.

THS Concepts cannot advise on any structural aspect of a building. Any structural information recorded is to be checked by third party Engineers for suitability.

If you suspect THS Concepts has recorded and presented an incorrect measurement, please let us know as soon as possible prior to further works taking place.

Data Retention: Upon completion of the works, all raw point cloud data will be retained on our server for a period of six months prior to deletion.

Data Provision: If required by the client, pertinent files related to the data can be provided either on a USB stick or through a cloud-based download link.

Ordnance Survey Reference: The data captured will not reference the Ordnance Survey national grid unless this has been previously agreed upon with the client.

Access and Quotation: Our service quotation is based on the presumption of unrestricted access to the site during standard working hours (09:00-17:30, Monday-Friday). This quotation does not account for any site inductions or unforeseen delays, unless previously agreed upon.

Client’s Access Responsibility: It is the client’s responsibility to ensure that access to all essential areas of the site is available on the scanning day. Any inaccessible areas will not be included in the scan and subsequently, will not be part of the deliverables.

Site Preparation: The client must arrange for the work area to be free from staff, visitors, and equipment where possible. In situations where this is challenging, there may be unavoidable delays, and additional work may become necessary.

Safety Compliance: The client must ensure the work area complies with the Health and Safety at Work Act and any other relevant regulations. Furthermore, it is the responsibility of the client or the employer’s representative to provide necessary temporary or task-specific lighting for the project.

Weather Dependency: All outdoor laser scanning tasks are dependent on appropriate weather conditions. The decision to proceed with the laser scan on any given day rests solely with THS Concepts LTD.

Note: Clients are advised to read and ensure they understand all terms before proceeding with our services.

Purpose: The Building Height Survey provided by THS Concepts Limited (“Company”, “we”, “us”, or “our”) aims to provide the client (“you” or “your”) with the height of a building and the number of stories to determine if a building is deemed “high risk” as per the Building Safety Act 2022.

Scope: The survey and subsequent report are based on the current government guidelines and the Building Safety Act 2022. Please be aware that governmental guidelines and regulations can be open to interpretation and may evolve over time.

Conservative Approach: In areas where the government guidelines are ambiguous or open to interpretation, we always adopt a conservative approach towards classification. This means we err on the side of caution, potentially classifying buildings as “high risk” even if there’s room for a different interpretation.

No Warranty: While we strive to ensure accuracy in our surveys and reports, we do not guarantee that the classification will remain unchanged in the event of future modifications to the Building Safety Act or other related regulations. Our report represents our best judgment and interpretation of the current guidelines at the time of the survey.

Limitation of Liability: THS Concepts Limited shall not be held liable for any direct, indirect, incidental, or consequential damages, including but not limited to loss of use, profits, or interruption of business, arising out of or in any way related to the interpretation or classification of buildings based on our survey report.

Indemnification: You agree to indemnify, defend, and hold harmless THS Concepts Limited and its directors, officers, employees, and agents from and against all claims, liabilities, damages, and costs (including attorneys’ fees) arising out of or related to your use of the survey and report, or any decision made based on our classification.

Review of Report: If you believe there are discrepancies or errors in our report, you must notify us in writing within 15 days of receiving the report. We will review and, if deemed necessary, revise our findings. No claims will be entertained after this 15-day period.

Third-Party Reliance: Our survey and report are prepared solely for your use. No third party may rely on the report without our explicit written consent.

Governing Law: These terms and conditions shall be governed by and interpreted in accordance with the laws of the jurisdiction in which THS Concepts Limited operates.

Acceptance: Engaging THS Concepts Limited for a Building Height Survey indicates your acceptance of these terms and conditions in full.

Service Provision: THS Concepts LTD (“the Company”) agrees to provide aerial photographic drone flight services (“the Services”) to the client as per the specifications provided in the agreed quotation or statement of work.

Safety and Compliance: All drone operations will be conducted in compliance with local aviation laws and regulations. The safety of the public and the integrity of the equipment will always be paramount. The Company reserves the right to delay or cancel flights if safety or legal compliance is in question.

Site Access: The client is responsible for ensuring access to the location on the scheduled day and time of the drone flight and ensuring that the area is safe and suitable for drone operations.

Weather Dependency: Drone flights are dependent on weather conditions. In the event of unsuitable weather (e.g., heavy rain, high winds), the Company may reschedule the flight to a suitable alternative date.

Data Collection: Upon completion of the drone flight, all photographic data will be processed and delivered to the client in the format specified in the agreement. The Company retains the right to store a copy of the data for backup purposes.

Usage Rights: While the client will have full rights to use the photographs for their specified purpose, the Company retains the copyright to the images and may use them for promotional or portfolio purposes unless explicitly agreed otherwise.

Liability: THS Concepts LTD is not liable for any indirect or consequential losses that might arise from the use of its drone services. Clients are advised to review and ensure the delivered data is fit for its intended purpose.

Indemnity: The client agrees to indemnify and hold the Company harmless from any claims, damages, or legal actions arising from the client’s use of the aerial photographs provided.

Fees and Payment: All fees for the Services will be as specified in the agreed quotation or statement of work. Payment is due within 30 days of the invoice date, unless otherwise specified.

Cancellation: Should the client wish to cancel the Services, they must do so in writing at least 48 hours before the scheduled flight. Cancellations made less than 48 hours in advance may be subject to a cancellation fee.

Confidentiality: Both parties agree to treat all information related to the Services as confidential and not to disclose it to third parties without prior written consent.

Governing Law: These terms and conditions shall be governed by and construed in accordance with [Jurisdiction/Country’s Law, e.g., “the laws of England and Wales”]. Any disputes arising under or in connection with these terms and conditions shall be subject to the exclusive jurisdiction of the [Jurisdiction/Country’s Courts, e.g., “English Courts”].

Unless otherwise stated, measured surveys are undertaken to RICS accuracy band E as per the RICS document ‘Measured Surveys of Land, Buildings and Utilities, 3rd edition’.

Please refer to our measured survey specification table to see what is and what is not included in your survey by default.

Roof plans and heights will be measured as accurately as possible, however, due to access or visibility some elements may be assumed and labelled on the drawing(s) accordingly.

Areas that cannot be seen (e.g. party wall thickness) will be assumed. If we cannot access areas of the building due to locked doors, we will inform the client for further guidance.

Our Surveyors are often required to access loft spaces. If you cannot provide safe access via a ladder or stair, please inform us prior to the survey date.

We typically operate technical instruments inside and outside of properties, usually in the form of total stations or 3D scanners on tripod legs. It is important that our equipment is not disturbed, touched, knocked or damaged by clients, children and animals. If you feel this could be an issue, please let us know prior to the survey date. 

Measured Survey Specification

As standard we will survey and indicate the following items:

Standard Items


  • Decorative hatching (roof tiles, brick etc.) – indicative


  • Inspection chamber & manhole positions (within site & public domain) – site plan only
  • Inspection chamber & manhole invert levels (within client’s property only) – where openable
  • Pipes (RWPs, SVP’s etc.)


  • Fixed furniture (built-in wardrobes, kitchen worktops etc.)
  • Kitchenware (sinks, hobs etc.) – indicative
  • Sanitaryware (toilets, basins, baths etc.) – indicative


  • Boundary & fence lines – site plan only
  • Low level garden walls – site plan only
  • Tree positions (>0.2m trunk diameter) – site plan only
  • Vegetation in outline (bushes, shrubs etc.) – site plan only


  • Boiler location
  • DCU location
  • Electric meter location
  • Gas meter location
  • Water tank location


  • Door positions with swing direction
  • Loft hatch position
  • Overhead beam positions
  • Skylight positions
  • Stair positions with directional arrow
  • Walls and partitions
  • Window positions


  • Ceiling & overhead beam heights
  • Door heights
  • External surface changes (grass, paving etc.) – site plan only
  • Floor levels (obvious changes)
  • Window cill & head heights

Additional non-standard items as shown below will need to be requested if required:

Additional Non-Standard Items


  • Architraves
  • Covings
  • Dados
  • Decorative mouldings
  • Fireplace detail (mantel, surround etc.)
  • Skirtings
  • Any other decorative feature not included as standard


  • Accurate kitchenware (sinks, hobs etc.)
  • Accurate sanitaryware (toilets, basins, baths etc.)


  • Audio & visual (door phones, ceiling speakers etc.)
  • Digital displays & controls (thermostats etc.)
  • Light fittings (ceiling, wall & floor)
  • Radiator lengths and positions
  • Sensors & detectors (smoke detectors, motion sensors etc.)
  • Sockets (13amp, 5amp, coaxial etc.)
  • Switches (lights, fused spurs etc.)
  • Vents & extracts (extractor fans, fresh air vents etc.)


  • Internal surface finishes (carpet, floorboards etc.)

If you require items which are not shown on either list, please get in touch to see if we can assist.

Setting Up A Monitoring Scheme

THS Concepts cannot be held liable for incorrect survey point placement. The client must review the post-installation report and suggest if additional or other locations are required.

A local control network of nails and targets will be installed at a safe distance from the work area. They’ll serve as our reference points. Unless otherwise requested, these will not be aligned to national ordnance grids.

THS Concepts secures monitoring targets to buildings and structures with strong adhesives and fixings. We are not liable for any damage caused by the installation or removal of targets. If you are concerned about this, please talk to us before we are on site.

We can only put up targets that are 4 metres off the ground (utilising a ladder). We may need the client to provide scaffolding or a movable access platform for higher monitoring stations. Where it is safe to do so, we can place targets out of windows.

Ongoing Surveys

THS Concepts will return to the site at the agreed-upon intervals as set out by the client and/or the survey specification during the monitoring term.

On each visit, THS Concepts will need clear access to the monitoring targets. If clear access is a problem, we have the right to impose extra fees because the required survey work may take longer.

We don’t provide a removal cost or targets. Reflective targets are disposable and may be easily removed and discarded. We ask that monitoring prisms be left to the side for us to collect or that you notify us if they need to be removed. Survey prisms that are misplaced or destroyed will be charged at £50+VAT per prism.


Following each site visit, we endeavour to return monitoring survey data within two working days. This takes the form of a table that specifies positional changes in millimetres to the closest millimetre. We’ve also included additional graphs and tables to show movement at each location. The last survey visit and the original base readings are referenced in each set of survey findings.


All invoices for survey monitoring will be sent on a monthly basis, with only one month of credit allowed. If previous debts are past due and unpaid, THS Concepts maintains the right to cancel scheduled site visits and withhold survey data.

Our standard setting out surveys include the provision of nails, timber pegs and retro targets. If you require items such as steel rods, road pins, fixed plastic datums or string lines, please let us know. Steel rods are charged at £2 each, fixed plastic datums at £4 each and string lines at £5 each. Other specific demarcation items will be charged at a price agreed between both parties before works commence and the items are ordered.

Unless the client has stated, we will use existing setting out points provided by the client in drawings that have been sent to us. Please state if this is not the case.

Our setting out is typically undertaken to tolerances of 5mm in plan and height on solid surfaces. For softer surfaces such as grass, gravel etc. this would be 20mm in plan and 20mm in height.

Please note that we cannot be held responsible for setting out markers when we are not on site as these can be moved by site workers, animals, weather etc.

We must have all relevant drawing & setting out data at least 24 hours prior to our arrival on site. This ensures we have sufficient time to programme the information into our equipment and check for erroneous data.

For site engineering all invoices will be issued on a monthly basis and only one month of credit will be permissible. THS Concepts reserve the right to cancel scheduled site visits or refuse work if previous invoices are overdue and have not been settled.

We will attempt to survey the positions of all visible inspection/service covers on site. If requested in the job specification, we will attempt to lift and record the invert levels. We may not be able to provide this if the lid cannot be physically lifted, is obstructed, damaged or requires specialist equipment to lift. We do not lift inspection chambers on the public highway or on land that we do not have permission to access.

Areas of dense vegetation will be surveyed in outline only and we will not be able to observe any levels or objects/items within the undergrowth. If you aware of areas of dense vegetation prior to our arrival, it is recommended that you clear this in order to maximise access and therefore survey data.

Topographical Survey Specification

Unless outlined in our either our quote or an attached specification sheet, we shall survey the following items as part of a topographical survey:

  • Building outlines (clients & immediate neighbours) – where visible
  • Changes in surfaces (grass, concrete, tarmac etc.)
  • Chimney outlines – where visible
  • Chimney heights – where visible
  • Drain gulley positions
  • Eaves heights (clients & immediate neighbours) – where visible
  • Embankments (top & bottom)
  • Fence lines – where visible/accessible
  • Finished floor level (ground floor only) – where accessible
  • Footpath extents
  • Inspection chamber & manhole cover positions (within site & public domain)
  • Inspection chamber & manhole cover levels (within site & public domain)
  • Inspection chamber & manhole invert levels (within client’s property only) – where openable
  • Kerb lines (tops & bottom)
  • Low level and retaining walls
  • Overhead utility lines
  • Pipes (RWPs, SVP’s etc.)
  • Planting areas
  • Poles (telegraph, power, pylons etc.)
  • Ridge heights (clients & immediate neighbours) – where visible
  • Road channels
  • Street fixed furniture (benches, phone boxes etc.)
  • Tree groups (>0.2m trunk diameter)
  • Tree spread (of trees >0.2m trunk diameter)
  • Tree trunk diameter (>0.2m)
  • Tree positions (>0.2m trunk diameter)
  • Vegetation outline (bushes & heavy brush)
  • Water course height (lakes, rivers, streams etc.) – where accessible
  • Water course outlines (lakes, rivers, streams etc.) – where accessible

Survey data to be referenced to Ordnance Survey (OS) coordinate system OSGB36. In rare instances where we cannot pick up a GPS signal this may not be possible.

A minimum of 2 permanent control stations (nails) will be left outside of the site. The co-ordinates of these are specified on the issued drawing(s).

At THS Concepts, we take the trust of our clients seriously. We never pass on your data to other companies or organisations and don’t store financial or personal data in the first place. Read on to find out how we use your personal information and how we keep it secure.


WordPress, our website host, may collect cookies.

When someone visits, we use a third party, Google Analytics, to collect standard internet log information and details of visitor behaviour patterns. We do this to find out things such as the number of visitors to different parts of our site. This information is only processed in a way which does not identify any user. We do not make and do not allow Google to make, any attempt to find out the identities of those visiting our website.

CAD Blocks

As part of the registration to download our free CAD blocks, we collect personal information. We use that information for a couple of reasons: to tell you about stuff you’ve asked us to tell you about; to contact you if we need to obtain or provide additional information; to check our records are right and to check now and then that you’re happy and satisfied. We don’t rent or trade email lists with other organisations and businesses.

Blog Subscription

As part of the registration to our blog subscription, we collect personal information. We use that information for one reason: to send you blog posts! We don’t rent or trade email lists with other organisations and businesses and we won’t send you any emails other than blog posts.

Our Clients

As part of the registration to our database when you sign up for a quick quote, a detailed quote or a general enquiry, we collect personal information. We use that information for a couple of reasons: to tell you about stuff you’ve asked us to tell you about; to contact you if we need to obtain or provide additional information; to check our records are right and to check now and then that you’re happy and satisfied with our service. We don’t rent or trade email lists with other organisations and businesses. We don’t sell data from our surveys or drawings, although we may use a completed drawing, graph or photograph from the site on our website, brochures and/or social media to promote our services. If you do not wish for us to share any drawings, graphs or photographs from your job on our website, brochure and/or social media, please let us know in advance of the job.

Third Parties

We do not share any personal information with third parties. Sometimes, due to the nature of our work, we will email an architect or contractor on a client’s behalf or vice versa. This is purely for communication purposes and is on a one-on-one basis. We do not pass on confidential information.

Viewing and Amending Information

You are entitled to view, amend, or delete the personal information that we hold. Email your request to our directors Tom Ayre and Chris Horton at

Data Storage

We store data on our secure private servers.

This policy was last reviewed on the 18th May 2018. We review our policy periodically. Please email for more information.