Fixed-fee planning, building regulations, loft, extension and mansard drawings for properties in Chiswick (W4). MCIAT chartered. 30% below typical London architect rates.
MCIAT chartered drawings for planning, building regs, lofts and extensions — fixed fees 30% below typical London architects. Tell us what you need and we’ll reply the same working day.
Chiswick is Edwardian villas, conservation. The streetscape is dominated by edwardian villas, victorian terraces, which means design decisions — roofscape, rear glazing, side returns, mansards — must respect the period rhythm of the row. Hounslow planning (Hounslow Council) decides applications here. Most permitted development rights apply normally in Hounslow for residential extensions.
From £840. Planning permission drawings delivered by an MCIAT chartered team.
From £840. Building regulations drawings delivered by an MCIAT chartered team.
From £1,225. Loft conversion drawings delivered by an MCIAT chartered team.
From £1,225. House extension drawings delivered by an MCIAT chartered team.
From £1,575. Mansard roof extensions delivered by an MCIAT chartered team.
From £995. Garage conversion drawings delivered by an MCIAT chartered team.
From £1,950. Basement conversion drawings delivered by an MCIAT chartered team.
From £350. Structural calculations delivered by an MCIAT chartered team.
From £540. Measured building survey delivered by an MCIAT chartered team.
From £450. Party wall services delivered by an MCIAT chartered team.
From £1,225. Rear dormer drawings delivered by an MCIAT chartered team.
Chiswick sits within Hounslow, so applications are decided by Hounslow Council. Most single-storey rear extensions and side-returns on terraced or semi-detached homes in Chiswick fall under Permitted Development — up to 3m deep (attached) or 4m (detached), under 4m high. Flats, listed buildings and conservation areas always require full planning. Article 4 status here: No. We check eligibility free at the site visit.
Chiswick is characterised by Edwardian villas, conservation. The dominant stock is Edwardian villas, Victorian terraces. We've drawn extensions and lofts for every period represented here — Victorian rear additions, Edwardian side returns, 1930s wrap-arounds, and contemporary infill where the streetscape allows.
Hounslow Council statutory determination is 8 weeks for householder applications. Validation typically adds 1–2 weeks. From your first call to a decision, expect 12–14 weeks total: 1 week measured survey, 2 weeks design, 1–2 weeks validation, 8 weeks determination. We've achieved a 98% first-time approval rate across Hounslow.
Loft conversion drawings in Chiswick start at £1,225 for planning + building regs combined. Construction cost (separate from drawings) is £45,000–£75,000 for a standard rear dormer on a Victorian or Edwardian terrace, £65,000–£95,000 for a hip-to-gable plus dormer. We quote drawings as a fixed fee — no hourly creep.
Hounslow has 30 designated conservation areas. Nearest to Chiswick: Chiswick. In a conservation area, full planning is required for most external work (including roof additions, rendering, replacement windows). We prepare a Heritage Statement covering the conservation area's character appraisal.
Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
Every Chiswick postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. Chiswick fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| W4 | Chiswick / Bedford Park | Edwardian villas, Victorian terraces | Chiswick / Bedford Park is split at W4. Either Hounslow Council or Ealing Council can determine a drawing package here, so the W4 address is checked against both policies maps first. |
| TW8 | Brentford | Georgian fragments, Victorian terraces, new-build | Neighbouring Brentford, where drawing package work is handled by the same Hounslow Council case officers. |
| TW7 | Isleworth | Georgian and Victorian terraces | Neighbouring Isleworth, where drawing package work is handled by the same Hounslow Council case officers. |
| TW3 | Hounslow | 1930s semi-detached, post-war flats | Neighbouring Hounslow, where drawing package work is handled by the same Hounslow Council case officers. |
| TW13 | Feltham | 1930s semi-detached, post-war estates | Neighbouring Feltham, where drawing package work is handled by the same Hounslow Council case officers. |
| TW13 | Hanworth | 1930s semi-detached | Neighbouring Hanworth, where drawing package work is handled by the same Hounslow Council case officers. |
| W4 | Turnham Green | Edwardian villas | Neighbouring Turnham Green, where drawing package work is handled by the same Hounslow Council case officers. |
Roof pitch, wall build-up and plot depth change every few Chiswick streets, and each one changes what a drawing package can achieve at that address.
Conservation areas covering Chiswick: Hounslow Council runs 30, and Old Isleworth, Brentford, Chiswick are the ones Chiswick owners meet most. A drawing package inside a Chiswick conservation area loses permitted development, so the Chiswick submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Bedford Park a drawing package is judged on the street elevation first.
Article 4 and your Chiswick drawing package: Hounslow Council has made no borough-wide direction, so permitted development for a drawing package in Chiswick generally survives outside Chiswick conservation areas and listed curtilages. A Lawful Development Certificate at £129 is how a W4 owner records that a drawing package was lawful.
Chiswick housing stock: Edwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in Brentford. Chiswick is one of west London's most conservation-controlled areas; outer Hounslow is permissive suburban. Read that before choosing a drawing package route in Chiswick — construction, not postcode, sets what is achievable. Architectural drawings in Chiswick start at £840 on a fixed fee, or £1,750 for the Complete package covering both Hounslow Council submissions.
Sources for this Chiswick drawing package page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
Fixed fee. MCIAT chartered. 98% first-time approval rate.
Start free quoteOr contact us about your project firstBefore you commit, it is worth understanding fixed fees, 30% below London architects and seeing why work with us. You can find your service to find the right fit, or open a client account to track your project. When you are ready, get a quote today — most homeowners have a fee in minutes — or contact us about your project and a chartered technologist will be in touch.