Sash Windows in Dulwich

Dulwich's Timber Window Specialists

Dulwich is unique in London — much of the area is managed by the Dulwich Estate, which imposes strict architectural standards on every property. The result is one of London's most beautifully preserved residential neighbourhoods. Georgian, Victorian, and Edwardian homes sit along tree-lined streets, almost all featuring original timber sash windows. East Dulwich adds rows of attractive Victorian terraces with classic bay-and-sash frontages. At Prime Sash Windows, we manufacture bespoke timber sash windows that honour Dulwich's heritage while delivering modern thermal and acoustic performance.

The Dulwich Estate acts as an additional layer of control beyond Southwark Council's own Conservation Area designations. Window replacements on Estate-managed properties must be approved by the Estate's surveyor, who requires timber frames, traditional profiles, and specific colour finishes. We have extensive experience working within the Dulwich Estate's guidelines and can supply windows that meet both Estate and council requirements.

Why Dulwich Homeowners Choose Us

Every window is manufactured in our workshop near London from engineered Accoya or premium hardwood. Accoya is guaranteed for 50 years against rot and fungal decay — far outlasting uPVC, which typically degrades within 20 to 25 years and cannot be repaired.

• Slimline double glazing — 4/16/4 sealed units with warm-edge spacer bars. U-value 1.4 W/m²K. Part L compliant.
• PAS24 security — multi-point espagnolette locking on all opening sashes.
• Traditional lead weights — we never use spring balances. Smoother operation, longer lifespan.
• Any colour — over 2,000 RAL colours and the full Farrow & Ball range. Dual colour available.
• 4–5 week delivery — manufactured in our UK workshop, not imported. Standard configurations delivered in 4–5 weeks.
• FENSA registered — Building Regulations self-certification and certificate on completion.

Every window is spray-finished with premium Sikkens coatings — a multi-coat system including primer, undercoat, and topcoat for a flawless, lasting finish.

Conservation Areas in Dulwich

Dulwich's Conservation Areas require careful attention to original window details. Listed buildings and protected properties need like-for-like replacements with specific glazing bar profiles, horn details, and putty-line sightlines. We produce windows with authentic slim meeting rails, ovolo or chamfer beading profiles, and run-through horns that match original period detailing.

We handle the paperwork too. Where planning permission is required, we supply detailed drawings and specifications. For most replacements in non-listed properties, our FENSA registration means no separate Building Control application is needed.

What We Offer

• Box sash windows — traditional double-hung sash windows with cords and lead weights.
• Casement windows — flush casement and stormproof designs for Arts and Crafts and modern properties.
• Slim Georgian bars — authentic planted or run-through glazing bars.
• Arched and shaped windows — gothic, segmental, and true-arch heads.
• Secondary glazing — for Listed buildings where external changes are restricted.

How It Works

• 1. Design online — Use our 3D configurator to design and price your windows instantly.
• 2. Free survey — We visit your Dulwich property, measure precisely, and confirm the specification.
• 3. Manufacture — Your windows are built in our workshop. Typical lead time 4–5 weeks.
• 4. Installation — Our FENSA-certified fitting team installs your windows with minimal disruption.

Areas We Cover in Dulwich

We serve all areas of Dulwich including Dulwich Village, College Road, Gallery Road, Calton Avenue, Lordship Lane, and the streets surrounding Dulwich Park and Dulwich Picture Gallery. We also cover neighbouring areas including Peckham, Herne Hill, Crystal Palace, Forest Hill, Camberwell, and Denmark Hill. Our workshop location allows prompt service throughout the SE19, SE21, SE22, and SE24 postcodes.