Yes, an old roof window can usually be replaced, and it is often simpler than adding a new one. What matters is the frame, the flashing and the state of the roof around it.
Roof windows age. Seals fail, frames get tired, and the flashing round them wears out. In Hanham, where older village homes sit beside inter-war and post-war houses, plenty of lofts have a roof window that has been there a long time. Swapping it for a new one is a routine job when the opening is sound.
Why replace rather than repair
A window that mists between the panes, will not open or close well, or leaks at the frame may be past useful repair. A failed sealed unit alone can sometimes be changed. But if the frame, hinges and flashing are all worn, a full replacement gives you a window and a weathertight surround that work together again.
Matching size and position
The simplest swap is the same size in the same place, since the opening, rafters and lining already fit. Changing size means altering the structure, which is a bigger job. We measure the existing opening, check the pitch of the roof and the type of window, and tell you what will fit. Many modern roof windows suit older openings well.
- Same size means the least disturbance.
- A larger window means trimming rafters.
- Pitch decides which models suit.
- Lining is checked for fit and damage.
The flashing kit matters most
Most leaks around roof windows come from the flashing, not the glass. A new window is fitted with a flashing kit matched to the roof covering, whether that is plain tiles, interlocking tiles or slate. The surrounding tiles are lifted and relaid so water runs around the frame properly. Getting this stage right is what keeps the window dry for years.
- Tiles lifted and set aside around the frame.
- A kit matched to the covering is used.
- Felt and underlay dressed correctly.
- Tiles relaid neatly around the new window.
Inside the room
Once the old window is out, we check the timbers around the opening for damp or rot, and repair what we find. The lining, insulation and vapour control around the new frame are put in so the room stays warm and condensation is limited. The inside is left neat and ready to decorate. If the structure needs altering, planning or Building Regulations checks may be needed and we advise before work starts.
What to ask first
Ask what window will be fitted and how it suits your roof. Ask how the roof will be kept weathertight during the job, and whether any damp around the opening will be repaired. On sloping roofs in Hanham, ask how access is arranged. A clear written description of the work should answer these.
Frequently Asked Questions
Do I need the same make of window?
Not necessarily. VELUX and similar roof windows come in many sizes, and a new one can often be matched to an old opening. What matters is the size, the roof pitch and a suitable flashing kit.
Can a leaking window just be resealed?
Sometimes a small defect can be resealed, but if the flashing has failed or the frame is worn, sealant is only a short-term fix. We look at the window and the covering and tell you honestly which it is.
Will replacing it make a mess indoors?
Some dust and debris is unavoidable, so we protect floors and furniture and clear up afterwards. The work is mainly done from the roof, and the inside is usually a short job once the new frame is in.
Talk to our team about VELUX and roof window installation in Hanham
Every roof is different — the fastest way to get an accurate answer is a quick chat with our team.