Wjn London Ltd
Window & double glazing company registered in London, Greater London
Registered address
3 OPAL CLOSE, London E16 3TT
✓ Active on Companies House
Companies House number10769880
IncorporatedMay 2017
9 years on the register
9 years on the register
Company typePrivate Limited Company
Trade (SIC 43320)Joinery installation (windows, doors & frames)
Accounts on fileMicro-entity accounts (smallest filing band) · last filed May 2025 · next due February 2027
Also registered for43330 - Floor and wall covering; 43390 - Other building completion and finishing; 43999 - Other specialised construction activities n.e.c.
Listed from the public Companies House register, not an endorsement. Quote requests go to FENSA or Certass registered installers covering your postcode, not necessarily this company. Accounts filing category reflects company size under Companies House rules, not service quality. Map location is approximate, based on the registered postcode.
Before you book Wjn London Ltd
This page confirms the company is on the Companies House register. It does not confirm FENSA or Certass registration, insurance, or trading status. Check those yourself first.
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How do I get a quote from a window installer in London?
Use the "Get Free Quotes" form on this page. Your job details go to FENSA or Certass registered installers covering the E postcode area, who contact you directly. London has 1,582 registered window and glazing businesses in this directory, though the installers who quote are not necessarily among them. It is free and there is no obligation.
Is new double glazing covered by a warranty?
uPVC frames typically carry a 10 year manufacturer or insurance-backed guarantee, and sealed glazed units are usually guaranteed separately for 5 to 10 years against misting. Register the guarantee after installation and keep the FENSA or Certass certificate — a buyer's solicitor will ask for it if you sell the property.
What is a FENSA or Certass certificate and why does it matter?
It's proof the window or door installation meets Building Regulations (thermal performance, safety glazing, ventilation) without a separate council building control sign-off. Without one, selling the property can mean paying for retrospective building control inspection or indemnity insurance, so keep the certificate with your house documents.
How many window and glazing companies are there in Greater London?
This directory holds 1,616 active window and glazing businesses across 26 towns in Greater London, all from the Companies House register. London accounts for 1,582, among the county's busiest. About 49% of Greater London's registered window and glazing firms were incorporated in the last three years, so weigh incorporation date and FENSA/Certass registration, not just company age.