A small roof with a big job
Bay windows are a defining feature of Victorian and Edwardian houses across Newcastle, Jesmond, Heaton and the coast. The roof above is usually small and complicated, with several angles, hips and junctions with the main wall. It may be covered in lead, slates, or a flat roofing material, and each type has its own failure points.
Common faults
- Cracked, creased or lifted lead, especially at joints and upstands
- Slipped or broken slates and failed pointing at the hips
- Flat roof coverings that have split or blistered
- Blocked or leaking gutters sitting at the edge of the bay
- Poor flashing where the roof meets the main wall
- Rotten timber, fascias and window heads from long-term leaks
What restoration involves
We begin by finding where water is getting in, which may not be where the stain appears inside. The covering is then stripped back to expose the structure underneath. Rotten rafters, firrings and boards are replaced, and the roof is recovered in a material suited to the building. On traditional properties lead is often the natural choice, with joints and rolls detailed correctly to allow for thermal movement. Slate and hip details are matched where possible. Lead flashings against the main wall are renewed, see lead flashing replacement.
Why the structure matters
Bay window roofs sit on a lightweight timber structure that has often endured years of water ingress. Replacing the covering without sorting the timber only hides the issue. Cracks above bay windows can also indicate a lintel or beam problem, see lintel replacement and repairs.
Insulation and ventilation
Re-roofing is a chance to improve the roof build up, but flat and low-pitch roofs need careful detailing to avoid trapped moisture. Building Regulations may apply to substantial work, see GOV.UK. In a conservation area, keep original materials and form. Contact the council or check the Planning Portal if unsure.
Frequently asked questions
Why does my bay window leak when it rains?
Common causes are failed lead or covering, slipped slates, blocked gutters and poor flashings at the main wall. The water often travels before it shows, so the entry point can be some distance from the stain.
Can bay roofs be done in lead?
Yes, lead is a traditional and durable material for bays when installed correctly with sensible joint spacing. We discuss options based on the building and your budget.
