The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical phase, ideal for edwardian villas in Chiswick and Turnham Green typical of Hounslow.
The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical phase, ideal for edwardian villas in Chiswick and Turnham Green typical of Hounslow.
Housing stock in Hounslow: Edwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in Brentford.
Character: Chiswick is one of west London's most conservation-controlled areas; outer Hounslow is permissive suburban.
Measured existing survey, photographic record, Article 4 and conservation check specific to Hounslow before we quote.
2–3 design options at concept stage — alternative layouts, glazing, roof forms.
Site location plan, existing and proposed plans, elevations, sections, D&AS where required.
Part L thermal, Part B fire, Part M accessibility, structural strategy.
Steel beam, foundation, lintel design. Chartered engineer sign-off.
Party Wall notices where needed; Thames Water Build Over Agreement where within 3m of a public sewer.
Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Direct answers to the questions Hounslow homeowners ask every week about house extension drawings.
Start a free quote →Most standard extensions in Hounslow qualify as Permitted Development — single-storey rear up to 3m/4m, side extensions up to half the width of the house, under standard national rules. Flats, listed buildings and conservation areas need full planning permission. We confirm eligibility at the free site survey.
Standard permitted development allows single-storey rear extensions up to 3m (attached house) or 4m (detached) in Hounslow. Larger extensions up to 6m/8m are allowed under Prior Approval (Class AA). Flats, listed buildings and Article 4 areas in Hounslow are excluded from these PD rights.
Our fixed-fee architectural package starts at £1,225 for a Hounslow extension (planning + building regs + structural). Typical Hounslow build costs are £2,400–£3,500 per square metre including VAT — so a 25m² side return extension is £60,000–£87,500 to construct.
Hounslow does not have a borough-specific basement policy beyond the national framework — basement conversions are generally permissible subject to structural, drainage and flood-risk considerations. Thames Water Build Over Agreements apply where you're within 3m of a public sewer.
Most Victorian terraces in Hounslow (particularly in Chiswick) benefit from both — a side return extension infills the narrow side passage to create a wider kitchen, a rear extension projects back into the garden. A wraparound combines the two. We recommend the best option at the free site visit.
Hounslow's edwardian villas in Chiswick and Turnham Green terraced and semi-detached stock typically suits rear single-storey extensions (kitchen-diners), side-return infill extensions, or double-storey rear. Wraparound extensions combine both directions for maximum gain. We recommend the most viable option at the free site visit.
We cover all Hounslow postcodes — {postcodes} — with local surveyors. Survey appointments within 3 working days. Fixed fees — no hourly billing.
Hounslow Council follows the London Plan and its own Local Development Framework. Extensions must match or complement existing materials, respect neighbour amenity and comply with Part L. We include a Pre-Application Advice summary where the planning history is complex.
We cover every London borough with the same fixed-fee approach. If your property sits on a boundary, here are the neighbouring options.
We cover every architectural technology service in Hounslow with one chartered team.
From £840. A fixed-fee, end-to-end service — measured survey, scaled drawings, Design & Access Statement where required, Planning P...
From £840. A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L ther...
From £1,225. Every loft type across every Hounslow roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning ro...
From £1,575. Hounslow's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards tha...
From £995. Turn your unused Hounslow garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full...
From £1,950. Full architectural technology service for basement digs and cellar conversions in Hounslow — structural underpinning des...
From £350. Chartered structural engineer calculations for every residential intervention in Hounslow — steel beams, lintels, pad fo...
From £540. Fixed-fee measured surveys across Hounslow from £540 — floor plans, elevations and sections to ±3mm accuracy. Leica Dist...
From £450. End-to-end Party Wall Act 1996 service for Hounslow — Section 1, 3 and 6 notices, schedule of condition surveys, party w...
From £1,225. London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your ...
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Free quote in 60 seconds. Fixed fee from £1,225. MCIAT chartered.
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