Sash Windows in Chelsea

Chelsea's Timber Window Specialists

Chelsea is one of London's most architecturally distinguished neighbourhoods. From the grand Georgian townhouses along the King's Road to the elegant Victorian terraces of Carlyle Square and the stucco-fronted properties of Chelsea Embankment, these homes demand windows of exceptional quality. At Prime Sash Windows, we manufacture bespoke timber sash windows that honour Chelsea's heritage while delivering modern thermal and acoustic performance.

The Royal Borough of Kensington and Chelsea enforces some of London's strictest planning controls. Much of Chelsea falls within Conservation Areas — including the Chelsea Park and Carlyle, Cheyne, and Royal Hospital Conservation Areas — where window replacements must closely match the original profiles. Our team has extensive experience navigating RBKC planning requirements, ensuring every window we produce satisfies heritage officers.

Why Chelsea 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.
• 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 Area Expertise

Chelsea's planning rules are among the strictest in London. Listed buildings and Conservation Area properties often require 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 Victorian and Georgian 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 Chelsea property, measure precisely, and confirm the specification.
• 3. Manufacture — Your windows are built in our workshop. Typical lead time 6–8 weeks.
• 4. Installation — Our FENSA-certified fitting team installs your windows with minimal disruption.

Areas We Cover in Chelsea

We serve all areas of Chelsea and the Royal Borough including Chelsea Embankment, King's Road, Sloane Square, World's End, Carlyle Square, Cheyne Walk, Chelsea Harbour, and the surrounding streets. We also cover neighbouring areas including Fulham, South Kensington, Belgravia, Battersea, and Pimlico. Our workshop location allows prompt service throughout the SW1, SW3, SW6, SW7, and SW10 postcodes.