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LEGAL

Privacy notice

This notice explains how Siteline (operated by Hampstead Renovations Group) handles personal data under UK GDPR and the Data Protection Act 2018. It is written for an early-stage product; it will be expanded before public launch.

What we collect

Address/postcode searches you run, and — only if you submit a feasibility-review request — your name, email, phone (optional), project type, budget range and any message you provide. We do not require an account.

Why, and our lawful basis

We process feasibility-review enquiries to respond to your request and arrange a review — lawful basis: performance of a request / contract (UK GDPR Art. 6(1)(b)). Sharing your enquiry with Hampstead Renovations or a vetted RICS/RIBA partner is done only with your explicit consent (Art. 6(1)(a)), captured by the consent checkbox, which is required and enforced server-side. You can withdraw consent at any time.

Sharing

We do not sell address lookups or reports. Consented feasibility enquiries are routed to Hampstead Renovations or a small panel of RICS-regulated partners where Hampstead does not operate. You see who will receive the enquiry before it is sent.

Retention

Enquiry data is retained for up to 24 months from last contact to handle your project and follow-ups, then deleted or anonymised. Aggregate, non-identifying analytics may be kept longer.

Your rights

You have the right to access, rectify, erase, restrict, or object to processing of your personal data, and to data portability. To exercise these, or to withdraw consent, contact us and we will respond within one month. You may also complain to the ICO (ico.org.uk).

Open data

Planning and property intelligence is derived from public datasets under the Open Government Licence and applicable licences; UPRN © Ordnance Survey. This is feasibility intelligence, not legal, planning or valuation advice.

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Siteline

London planning intelligence, address by address. Constraints, precedent and cost intelligence for London property — cited to official sources, free to check.

Boroughs

  • Camden
  • Westminster
  • Islington
  • Hackney
  • Haringey
  • All areas →

Projects

  • Rear extension
  • Side return extension
  • Loft conversion
  • Basement extension
  • Garden room

Guides

  • Party walls: notices, awards, and your neighbours
  • Listed building consent — the permission inside the permission
  • Licence to alter — the consent nobody tells flat owners about
  • Do you need planning permission for a rear extension in London?
  • How much does a rear extension cost in London? 2026 £/m² ranges
  • All guides →

Company

  • About Siteline
  • Methodology & data
  • FAQ
  • Privacy
© 2026 Siteline · Operated by Hampstead Renovations Limited, registered in England & Wales No. 16838595, Unit 3 Palace Court, 250 Finchley Road, London NW3 6DN. Contains public sector information licensed under the Open Government Licence v3.0 — postcodes.io, HM Land Registry Price Paid & UK HPI, planning.data.gov.uk. UPRN © Ordnance Survey. Planning and cost intelligence for early feasibility only; not legal, planning, valuation or surveying advice.