Kew TW9 · UNESCO Setting
Kew Gardens Windows.
Why Kew Gardens is different
The streets immediately surrounding the Royal Botanic Gardens, Kew, sit within Richmond Council's Kew Gardens Conservation Area, with the gardens themselves a UNESCO World Heritage Site. The housing stock is predominantly Victorian terraced (typically 1870s–1900) with later Edwardian additions, characterised by timber sash windows on principal elevations, casement windows on side returns, and ornamental tiled or brick detailing.
In 2026 Richmond Council has been progressively tightening guidance for streets immediately adjacent to the UNESCO buffer zone, with Permitted Development rights reviewed on a street-by-street basis. The headline planning rule for window work mirrors the rest of Richmond: like-for-like timber on non-listed dwelling houses is normally PD; flats, listed buildings, and any visible material change are scrutinised. Verify your address with Richmond Council Planning before placing an order.
What's allowed, what isn't
Practical guidance for the typical Victorian or Edwardian terrace in the Kew Gardens Conservation Area. Listed buildings always require LBC. Flats always require planning permission for window changes.
| Specification | Front / street-visible | Side / rear elevation |
|---|---|---|
| Timber sash, like-for-like | Normally permitted (PD) | Normally permitted |
| Heritage uPVC sash with run-through horns | Often approved on Victorian terraces | Routinely approved |
| Edwardian-style casement, timber | Normally permitted | Normally permitted |
| Slim aluminium sliders / casement | Refused on principal elevations | Approved on rear extensions |
| Smart Aluspace SR (steel-look) | Refused on Victorian frontages | Approved on rear extensions |
| Modern white uPVC casement, smooth finish | Refused | Refused if visible |
| Replacement frames thicker than original | Refused | Refused |
Recommended systems
Specifications consistent with Richmond Council's Kew Gardens conservation guidance and the dominant Victorian / Edwardian character.
| System | Best for | Approval pattern |
|---|---|---|
| Timber sliding sash (Accoya / hardwood) | Front elevations on Victorian terraces | Reliable approval |
| Heritage uPVC sash with run-through horns | Side / rear, value-led replacements | Routinely approved on non-front elevations |
| Edwardian casement, small-pane top light | Side returns, garden-facing | Reliable approval |
| Smart Aluspace SR steel-look (Crittall replacement) | Contemporary rear extensions | Approved as modern intervention |
| Slim aluminium sliding doors | Rear extensions onto garden | Routinely approved |
Kew Gardens window prices
Fitted prices for window replacement in the Kew Gardens Conservation Area, TW9, Q2 2026. All include VAT, frame, slim or standard double-glazed units, fitting, removal of old window, internal and external silicone, and FENSA self-certification (Reg 40373) where applicable.
| Specification | Application | Low | High |
|---|---|---|---|
| Heritage timber sash (Accoya, slim DGU) | Front elevation, Victorian terrace | £2,400 | £3,800 |
| Heritage timber sash, standard size | Upper floors | £1,800 | £2,800 |
| uPVC Heritage sash with run-through horns | Side / rear | £950 | £1,650 |
| Edwardian-style timber casement | Side returns | £1,400 | £2,400 |
| Smart Aluspace SR steel-look | Rear extension | £1,200 | £2,400 |
| Slimline aluminium sliding door | Rear, garden-facing | £4,500 | £9,000 |
| Internal secondary glazing | Listed properties, acoustic upgrade | £600 | £1,400 |
Frequently asked
Is Kew Gardens a conservation area?
Yes — the streets surrounding the Royal Botanic Gardens, Kew, are covered by the Kew Gardens Conservation Area, designated by Richmond Council. The Royal Botanic Gardens, Kew, are themselves a UNESCO World Heritage Site, which adds an extra layer of sensitivity to nearby development. The conservation area predominantly covers Victorian and Edwardian terraced housing built between roughly 1870 and 1910 around the gardens.
Do I need planning permission for windows in Kew Gardens?
For non-listed dwelling houses in Kew Gardens without a current Article 4 Direction, like-for-like window replacement is normally Permitted Development. However, Richmond Council has been progressively tightening guidance for streets close to the UNESCO buffer zone, and in 2026 some specific streets carry additional restrictions on PD rights. Listed properties always require Listed Building Consent. Always verify your address with Richmond Council Planning before ordering.
Can I have uPVC windows in Kew Gardens?
Heritage uPVC sash windows with run-through horns are routinely approved on side and rear elevations of non-listed Victorian and Edwardian properties around Kew. Front elevations facing the streets adjacent to the gardens are reviewed more carefully — quality heritage uPVC with the correct profile and frame proportion is sometimes accepted, but timber is the safer specification on principal frontages within the UNESCO buffer.
What's allowed on rear extensions in Kew?
Slim aluminium sliding doors, Smart Aluspace SR steel-look casements, and slim aluminium fixed lights are all routinely approved on rear extensions in the Kew Gardens Conservation Area. Where the extension itself requires planning permission (under householder PD limits or because the property is in a tighter restricted zone), the windows are normally specified within that single planning application.
How much do Victorian sash windows cost in Kew?
Victorian sash window replacement in Kew Gardens TW9 costs £1,800–£3,800 per window fitted in 2026. Pricing depends on size (large bay windows on the principal terraces sit at the top of the range), material (engineered hardwood / Accoya for timber, heritage uPVC for value), slim double-glazed units (typically 4-8-4mm or 4-12-4mm), and reinstatement of original glazing bars and run-through horns.
Are properties in Kew Gardens listed?
Most Victorian and Edwardian terraced houses in the streets around Kew Gardens are not individually listed — they're protected at conservation-area level rather than individually. However, individual buildings of architectural or historical interest within the conservation area are listed Grade II. The Royal Botanic Gardens Kew themselves contain numerous listed structures and are a UNESCO World Heritage Site. Check Historic England's National Heritage List for England for any specific address.
What's a Crittall replacement option in Kew?
For non-listed properties in the Kew Gardens Conservation Area, Smart Aluspace SR is the most commonly specified Crittall-replica system. It uses thermally-broken slim aluminium with steel-look profiles, takes any RAL colour (most commonly satin black or jet-black RAL 9005), achieves modern double or triple glazing performance, and is routinely accepted by Richmond Council heritage officers as a contemporary intervention on rear extensions and modern outbuildings.
Who handles the Richmond Council planning application?
Apex Glazing surveys the property, prepares like-for-like elevation drawings, and supplies the technical specification needed for a Richmond Council householder planning or Listed Building Consent application. The application itself is normally submitted by the homeowner or their planning agent through the Planning Portal. We coordinate closely with local heritage architects and provide supporting technical drawings as part of the package.
