Wembley is home to thousands of period properties — Victorian terraces, Edwardian semis and interwar houses — many of which still have their original sash windows, or have had them replaced with poorly fitted UPVC alternatives that do little justice to the architecture.
If you’re looking to restore original sash windows or replace them with quality timber alternatives in Wembley, this guide covers everything you need to know.
Why Sash Windows Are Common in Wembley
The majority of residential streets in Wembley, Wembley Park, North Wembley and the surrounding areas of the London Borough of Brent were developed between the 1880s and 1940s. Victorian and Edwardian properties built during this period were constructed with vertical sliding sash windows as standard — originally single-glazed, timber-framed and box-weighted.
Many of these windows are still in place, though decades of repainting, neglect or amateur repairs have left them draughty, difficult to operate or visually compromised. Others were replaced during the UPVC boom of the 1990s and 2000s — often to the detriment of the property’s character and value.
Restoration vs Replacement: Which Is Right for Your Wembley Property?
The first decision to make is whether to restore the existing windows or replace them entirely. Both options are valid — the right choice depends on the condition of the existing frames, your budget and your long-term plans for the property.
When Restoration Makes Sense
- The original frames are structurally sound with no significant rot
- You want to retain the exact profile and character of the originals
- The property is in a Conservation Area or is listed
- Budget is limited — restoration is typically cheaper than full replacement
Restoration typically involves stripping and repainting, replacing sash cords, draught-proofing the frame, and upgrading to double-glazed sashes where the original boxing allows.
When Replacement Is the Better Option
- The frames have extensive rot or structural damage
- The windows have already been replaced with UPVC and you want to upgrade
- You want improved thermal performance with modern double or triple glazing
- You’re undertaking a full renovation and want consistent, new joinery throughout
Replacement with bespoke timber sash windows gives you a product that matches the original profile exactly, with modern performance built in.
Timber Sash Windows in Wembley: What to Expect
A bespoke timber sash window for a Wembley period property is manufactured to match the exact dimensions and profile of the original. Key features to look for:
Glazing bars – the thin dividing bars within the sash. Victorian windows typically had six or more panes per sash; Edwardian properties often used two panes per sash. Getting this right is critical for authenticity.
Ovolo or lamb’s tongue moulding – the profile of the frame and glazing bars. Each period has characteristic profiles; a reputable manufacturer will match these precisely.
Double glazing – modern double-glazed units can be fitted within slim timber profiles, significantly improving thermal performance without compromising appearance. Slim-profile sealed units of 4mm–4mm are standard for period replacements.
Draught-proofing – fitted brush pile seals eliminate cold draughts without affecting the sliding action of the sashes.
Ironmongery – traditional sash lifts, fitch catches and pulleys in brass or chrome finish the look correctly.
Planning Permission and Conservation Areas in Wembley
Most sash window replacements in Wembley do not require planning permission, as they fall under Permitted Development rights. However, there are exceptions:
- Properties within a Conservation Area – the London Borough of Brent has several designated Conservation Areas. In these, replacements must match the original in style, material and finish.
- Listed buildings – Listed Building Consent is required for any alteration to a listed structure.
- Article 4 Directions – some areas have Article 4 Directions which remove Permitted Development rights for window replacements.
If you are unsure whether your Wembley property is affected, check our sash windows London page for guidance or contact the London Borough of Brent planning department before ordering. A reputable window company will advise you on this during consultation.
Sash Window Costs in Wembley
Costs vary depending on whether you are restoring or replacing, and the size and specification of the windows. As a general guide:
| Type | Cost Per Window |
|---|---|
| Draught-proofing and repainting (restoration) | £300 – £600 |
| Full sash restoration with new cords and hardware | £600 – £1,200 |
| New bespoke timber sash window (supply and fit) | £1,200 – £2,500 |
| New bespoke timber sash window with double glazing | £1,500 – £3,000 |
A typical Wembley terrace with eight sash windows would cost approximately £12,000–£24,000 for a full replacement in bespoke double-glazed timber. For a more precise estimate, try our sash windows cost calculator.
Why Choose International Windows Group for Sash Windows in Wembley?
International Windows Group manufactures bespoke timber windows and doors from our London facility, with short lead times and no reliance on overseas supply chains. We work directly with homeowners, architects and contractors across Wembley, Wembley Park, Harrow, Alperton and surrounding areas.
- Bespoke manufacture to your exact dimensions and profile
- Double and triple glazing options for period properties
- Free measurement with every order
- Professional installation including removal of old windows
- Advice on Conservation Area compliance
We also serve North London and have a dedicated page for timber front doors in Wembley.
Frequently Asked Questions
Can I replace sash windows with timber in a Conservation Area in Wembley? Yes — in most cases timber sash replacements that match the original in profile and finish are acceptable in Conservation Areas. UPVC replacements are generally not permitted. Always confirm with Brent Council before proceeding.
How long do bespoke timber sash windows last? With proper maintenance — repainting every 5–8 years and periodic hardware checks — quality engineered timber sash windows can last 40–60 years or more.
Do replacement timber sash windows improve energy efficiency? Yes, significantly. A draught-proofed, double-glazed timber sash window dramatically reduces heat loss compared to a single-glazed original or a poorly fitted old window. See our detailed sash windows cost guide for North London for more detail on what to expect.
How long does installation take? A standard residential installation of 6–10 windows typically takes 2–3 days. We include removal and disposal of old windows as part of our fitting service.
What is the lead time for bespoke timber sash windows? Our standard lead time is 4 weeks from deposit. We will confirm exact timelines at the point of order.
International Windows Group specialises in bespoke timber windows and doors for London properties. We serve Wembley, Wembley Park, Harrow, Alperton, Ealing and surrounding areas.