Common warning signs include cracks running along the sill surface, paint peeling or flaking off, concrete spalling or breaking away, visible gaps between the sill and the wall, water stains or damp patches on the wall below the window, moss or algae growing on the sill, and a soft or powdery surface when you press on it. If you can see any of these, it’s worth getting the sills checked before the damage spreads to the brickwork below.

A repair is suitable when only part of the sill has cracked or spalled – we cut back the damaged area, form a new section and blend it with the existing surface. A full replacement involves removing the entire damaged sill covering and forming a completely new stone or concrete surface over the existing structure. We’ll always advise which option makes sense based on the condition of your sills.

Cracked or crumbling sills allow water to penetrate the brickwork below. Over time this causes damp patches inside, blown plaster, staining and long-term brick decay. In winter, water that’s soaked into cracks freezes and expands, making the damage worse with every frost cycle. A small crack today can turn into a major brick repair job if left untreated.

Yes. We can colour-match new sill coverings to your existing exterior finish, whether that’s a natural stone look, painted concrete or a specific colour. We use specialist masonry paints and sealants to achieve a consistent, clean finish across all repaired and replaced sills.

Yes. We use the same proven repair techniques on all types of exterior stonework, including stone steps, door headers, pillar caps, lintels, quoin stones and string courses. If you have multiple items that need attention, we can usually deal with everything in one visit.

A properly formed new sill covering, using the right materials and finished with a quality sealant, should last for decades. The key is proper preparation – cutting back all damaged material, forming the new surface to the correct profile with a proper drip edge, and sealing it against moisture. We don’t cut corners on preparation, which is why our repairs last.

A single window sill repair can often be completed in a few hours. Multiple sills or full replacements across a property may take one to two days depending on the number and condition. We’ll give you a clear timeline in your quote so you know exactly what to expect.

Ground-floor sills can usually be repaired from a ladder or low platform. For first-floor sills and above, scaffolding or a tower scaffold is normally needed for safe access. We arrange all access as part of the job – it’s included in your quote and you don’t need to organise anything separately.