Privacy Policy — TM Measure

Last updated: 23 May 2026

This policy explains how TM Architectural Designs Ltd. ("we", "us", "our") handles personal data when you use the TM Measure mobile app on iOS or Android. It is written to comply with the UK General Data Protection Regulation (UK GDPR) and the Data Protection Act 2018.

If you just want the short version: we only collect what we need to prepare your design quote, raw camera frames stay on your device, and you can email us at any time to get your data deleted. The reference photos you choose to send with a project are uploaded to our private Google Drive folder so our architect can review them alongside your dimensions.

1. Who we are

TM Architectural Designs Ltd. is the data controller for information collected through TM Measure.

• Registered office: 24 Criffel Avenue, London, SW2 4AZ
• Company number: 16719956
• Contact: inquiries@tmdesignsltd.com

If you have a question about this policy or about the data we hold on you, email the address above and we will respond within 30 days.

2. What we collect

When you use TM Measure we collect the following, and only the following:

Information you type in:

• Your name
• Your email address
• A project name or reference you choose
• Room labels (e.g. "Kitchen", "Bedroom 1")
• Room dimensions — width, length, height — in metric or imperial units
• Optional notes you add to a room

Photos you choose to attach:

• Reference photos you capture or pick from your photo library and attach to a room or a specific wall. These are compressed on your device (max 1600 px on the long edge) and uploaded to our private Google Drive folder when you submit a project. They are visible only to our architect — never publicly listed.

Information generated by the app on your device:

• Measurement confidence indicators (high / medium / low) produced by our scan algorithms
• A re-projection error metric (in pixels) so we can flag low-confidence scans
• A timestamp recording when each measurement was captured
• The unit preference you selected (metric or imperial)
• A locally-stored camera-focal-length calibration value, so you don't have to recalibrate each time. This is hashed against your device's user-agent string and never leaves your device.

What we do not collect:

• We do not collect your precise location.
• We do not collect your contacts, calendar library, health data, or financial data.
• We do not use third-party advertising identifiers (IDFA, AAID).
• We do not run third-party analytics SDKs inside the app.
• We do not upload raw camera frames, LiDAR point clouds, or video recorded during an auto-scan. Scan processing happens entirely on your device; only the final numeric dimensions and the reference photos you explicitly attach are ever sent to us when you submit your project.

3. How we use your data, and why we're allowed to

We process your personal data for three purposes:

To prepare your design quote. When you submit a project in TM Measure, we receive your name, email, project reference, and room measurements, and we use that information to prepare a quote or proposal for the architectural design work you are enquiring about. Our lawful basis is Article 6(1)(b) UK GDPR — performance of a contract, because you are asking us to take steps at your request prior to entering into a contract.

To contact you about your enquiry. We will email you about the quote you requested, and we may reply to follow-up questions you send us. Lawful basis: Article 6(1)(b) — performance of a contract.

To keep business records. We retain submitted project details so we can evidence the work we quoted for, defend ourselves against disputes, and meet HMRC record-keeping obligations. Lawful basis: Article 6(1)(c) — legal obligation (for tax records) and Article 6(1)(f) — legitimate interests (the interest being the ordinary running of a design practice, balanced against your privacy by the minimisation steps in section 2).

We do not use your data for marketing, profiling, or automated decision-making.

4. Who we share your data with

We only share your data with third parties who help us run the service. Each is bound by a written contract (a Data Processing Agreement) to use your data only on our instructions.

• Our email provider — Gmail (Google Workspace), used to receive your submissions and reply to you.
• Our backend processor — Google Apps Script, which receives the submission from the app, writes the row to a Google Sheet, and forwards the email to us. Hosted by Google in the UK / EU.
• Our photo storage — Google Drive, where your reference photos are stored in a private folder named after your submission ID. The folder is set to "Anyone with the link can view" so our architect can open the images, but the link is unguessable and never published.
• Our app platform providers — Apple (for the iOS App Store distribution of TM Measure) and Google (for the Google Play Store distribution). Apple and Google may collect limited technical data as described in their own app-platform privacy notices; we do not pass your personal data to them.

We do not sell your data. We do not share it with advertisers or data brokers.

5. Where your data is stored

Data submitted through TM Measure is received by our Google Apps Script backend, logged into a Google Sheet, and forwarded as an email summary into our Google Workspace inbox. Reference photos are stored in a private Google Drive folder. All four services are hosted by Google in the UK and EU. If Google moves your data outside the UK/EEA under their standard terms, the transfer is covered by the UK Addendum to the EU Standard Contractual Clauses, which is the legal safeguard approved by the ICO.

Raw camera frames, LiDAR point clouds, and any per-device calibration values generated by the app stay on your device and are not stored on our servers.

6. How long we keep your data

• Active project enquiries: for as long as the enquiry is open, plus 12 months.
• Signed-off project records: 6 years from the end of the tax year in which the work was completed, to comply with HMRC rules.
• Enquiries that do not progress to a quote: 12 months from your last contact, then deleted.

You can ask us to delete your data sooner — see section 8.

7. Device permissions the app asks for

TM Measure asks for two device-level permissions, and only uses them while the relevant screen is open:

• Camera — used for the auto-scan feature. Camera frames are processed on your device to estimate room dimensions; they are not recorded, saved, or transmitted. You can use TM Measure without granting camera access — simply type dimensions in manually instead.
• Motion and orientation sensors — used on supported iPhones and iPads for LiDAR-assisted scanning, to help the app track where you are pointing. This data is processed on your device and is not transmitted.

You can revoke either permission at any time in your phone's Settings app.

8. Your rights

Under UK GDPR you have the following rights, free of charge:

• Right of access — a copy of the data we hold on you.
• Right to rectification — correction of anything inaccurate.
• Right to erasure — deletion of your data (subject to our legal obligation to keep tax records).
• Right to restriction — pausing our use of your data while a dispute is resolved.
• Right to data portability — receiving your data in a structured, machine-readable format.
• Right to object — to processing carried out under legitimate interests.
• Right to withdraw consent — where consent was the lawful basis (we do not currently rely on consent, so this is unlikely to apply).

To exercise any of these, email inquiries@tmdesignsltd.com. We will respond within one month.

If you are unhappy with how we have handled your data you can complain to the Information Commissioner's Office (ICO):

• Website: https://ico.org.uk/make-a-complaint/
• Helpline: 0303 123 1113

We would appreciate the chance to resolve your concern first, but you can go straight to the ICO if you prefer.

9. Children

TM Measure is intended for use by adults commissioning architectural design work on their own property. It is not directed at children and we do not knowingly collect data from anyone under the age of 16. If you believe a child has submitted data through the app, email us and we will delete it.

10. Security

We protect your data with:

• TLS (HTTPS) encryption for all data sent from your device to us.
• Two-factor authentication on the email accounts that receive submissions.
• Access limited to staff who need it to prepare your quote.
• Device-level encryption on the phones and laptops used to handle your data.

No system is perfectly secure. If a breach affects your data and is likely to result in a risk to your rights, we will notify you and the ICO within the 72-hour window required by UK GDPR.

11. Changes to this policy

If we change how we handle your data we will update this page and revise the "Last updated" date at the top. For significant changes — for example, adding a new third-party processor or a new category of data — we will also email everyone we have an active enquiry with.

12. Governing law

This policy is governed by the laws of England and Wales. Any dispute relating to it will be heard by the courts of England and Wales.

TM Architectural Designs Ltd., trading as TM Measure.