About

WindowSim

About

Effective 6 September 2026

WindowSim is a photo-to-quote app for UK window and door fitters. Photograph the openings, draft an indicative estimate on this device, and edit units and fitting in pounds sterling. A photo-only price is not a fixed quote and not a site visit.

What you draft

You photograph window and door openings, then draft a supply-and-fit estimate on this device. Edit units, fitting, VAT, and your firm name. Nothing is sent to a customer until you share or print it yourself. The product domain is windowsim.com. It is not printed on customer quotes.

This app is for tradespeople quoting UK windows and doors. It is not for children.

Photo-only price is an indicative estimate, not a fixed quote and not a site visit. WindowSim does not replace a site visit, a competent person scheme (FENSA, CERTASS, and similar), or Building Control. Quotes stay drafts on this device. Nothing is sent to a customer.

What the customer sees

Print, PDF, WhatsApp, share, and email show the company name you set in Settings. They do not show WindowSim, WindowQuote, Bond Labs, windowsim.com, or a WS- or WQ- prefix.

Set your trading name in Settings first. Ready and confirmed estimates freeze that name and logo. This About page never prints on that paper.

Open the company card

What this is not

  • Not a site visit
  • Not a fixed quote
  • Not a FENSA, CERTASS, or ASSURE certificate
  • Not Building Control approval
  • Not a U-value or Part L finding from a photo
  • Not for children

Legal identity

Legal identity for this app. It is not printed on Settings, home, a job, or a customer quote.

WindowSim is a trading name of Bond Labs Limited. windowsim.com

Legal name
Bond Labs Limited
Registered in
England and Wales
Company number
17285766
ICO registration
ZC188014ICO registration is a fee listing, not a badge and not ICO-approved.
Registered office
71-75 Shelton Street, Covent Garden, London, WC2H 9JQ
Domain
windowsim.com