Replacement windows London,
with the certificate your buyer will ask for.
Replacement windows are building work. In England they have to meet the Building Regulations, and the proof is a FENSA certificate or a Building Control sign off. Surveys flag the ones that have neither.
Match the house,
then meet the regulations.
Since 2002, replacing windows and external doors in England has had to comply with the Building Regulations for energy performance, ventilation, safety glazing and means of escape. Our windows and doors are installed by FENSA registered installers, so the certificate is lodged after the job and you receive a copy. Without one, a buyer's solicitor asks for an indemnity policy or a retrospective inspection.
Whatever the material, a good quote covers the maximum U value, trickle ventilation, safety glass in doors and low windows, and an escape opening in habitable rooms above the ground floor. A cheap one leaves them out.
Energy efficient glazing makes a real difference in a draughty period house: warmer rooms, less condensation on the glass and quieter streets, which matters on a busy London road.
Sash windows
Victorian and Edwardian terraces were built with timber sashes. They can often be repaired and draught sealed, or fitted with slimline double glazing, and in a conservation area or under an Article 4 direction that may be the only route the council accepts. Where replacement is right, timber or a close uPVC match keeps the proportions.
Casement windows
From 1930s metal casements to later flats, casements suit timber, uPVC or aluminium. uPVC is the lowest maintenance, timber suits period houses, and aluminium gives slim frames and large panes.
Misted units, not new windows
Where only the glass has misted, the sealed unit is swapped in the existing frame. That is on our misted glazing page.
Front doors, French doors
and the making good.
External doors fall under the same rules as windows and the same certificate covers them.
Front and back doors
A new front door on a period house is a security and insulation upgrade as much as a cosmetic one. Composite and timber doors both do the job well, with multipoint locks and the right glazing.
French and bi-fold doors
Rear doors are where people want French or bi-fold doors, which can mean widening the opening. That brings in a lintel and a structural check, all managed by GMAS as one job.
Replaced windows leave reveals to make good, sills to rebed, and plaster and decoration inside. Those details decide whether a job looks finished, and they are part of the price.
The process is simple. We survey and measure every opening, agree the material, style and glazing with you, and give a fixed written quote. Windows are made to measure, then fitted with the openings closed up the same day wherever possible, so the house is never left open overnight. The certificate follows once the installation is registered.
Questions we get
asked most.
Get a written
price.
Monday to Saturday 9am to 8pm, Sunday 9am to 3pm. All London boroughs.
Message us on WhatsAppSend the survey page or a photo and we will tell you what it means and what it will take to fix.
Often needed
alongside this.
Areas we cover.
We take window and door replacement across all 32 London boroughs. Most of our work is in west London, in Shepherd's Bush, Hammersmith, Fulham, Kensington, Chiswick and White City, and in south west London, in Putney, Wandsworth and Wimbledon. We also work in south east London, in Greenwich, Blackheath and Lewisham.
If your property is outside these areas, call us anyway. We travel across London and will tell you honestly if a job is too far to price properly.