An ageing roof window can usually be swapped for a new one without reworking the whole roof. This guide covers what we check and what affects a straightforward replacement in Old Market.
Roof windows in Old Market lofts and top-floor flats can be left alone for a long time, and then start to mist, stick or let in drips. Replacing one is often simpler than people expect, provided the new window, the flashing and the surrounding roof all suit each other.
Same opening or a new one
The easiest case is a new window in the same size as the old. The existing opening and rafters stay as they are, and the work is mostly the window, the flashing and the lining. If you want a bigger window, rafters may need trimming and doubling up, which is a larger job that we plan separately.
Even a like-for-like swap needs the opening to be checked. Rafters and the surrounding battens must be sound, and any rot found when the old window comes out is dealt with there and then, rather than covered over and left to spread.
Why the flashing gets replaced too
A new window is matched to a flashing kit for your roof covering, so the old flashing normally comes off with the window. Reusing worn flashing around a new unit would put a fresh window into a weak surround. Getting this part right is what keeps the opening watertight.
Is it the window or the roof around it
Many leaks blamed on the glass actually come from the flashing, the sealing, condensation or the covering around the window. Misting between the panes means the sealed unit has failed, and that does call for a replacement. We find out which problem you have before suggesting a new window.
If the covering around the window has slipped or cracked, a new window will not cure the leak on its own. We repair the surrounding roof at the same visit, so the result is dry as well as new, and not a fresh window in a failing surround.
Lining, insulation and the inside
Inside, the lining, insulation and vapour control around the opening affect comfort and condensation. When replacing an older window, we check these as well and renew them where they are damaged or missing. Top-floor rooms and loft conversions in central Bristol benefit from this, since cold spots show up quickly there.
- Is the glass misted, or is the leak at the edges?
- Does the covering around the window need repair too?
- Is the lining damp, stained or coming away?
- Do you want the same size or a larger opening?
Planning the replacement
Access in the centre is often tight, so we plan scaffolding, deliveries and protection for the room below. The old window is removed, the new one fitted and flashed, and the room tidied. If anything wider is needed, it may need planning or Building Regulations checks, and we advise before work starts.
Frequently Asked Questions
Can I keep the old frame?
Usually no. The frame, flashing and lining are renewed with the window so they work as a set. Keeping an old frame risks weak seals and leaks, which is exactly what a replacement is meant to solve.
My window is misting. Is that a leak?
Misting between the panes usually means the sealed glass unit has failed. It is a separate matter from a drip, though the two can occur together in an older window. We check both before recommending a replacement.
Will the roof need opening up?
Yes, around the window. We open the roof only as far as needed, fit the new window and flashing, and make the roof weathertight again. We protect the room below and explain the order of work beforehand.
Talk to our team about VELUX and roof window installation in Old Market
Every roof is different — the fastest way to get an accurate answer is a quick chat with our team.