Planning drawings, building regulations, loft conversions, house extensions and mansards — delivered across Hounslow by MCIAT chartered technologists with deep knowledge of Hounslow Council's policies.
A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessib...
Every loft type across every Hounslow roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regu...
The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical p...
Hounslow's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in ...
Turn your unused Hounslow garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulati...
Full architectural technology service for basement digs and cellar conversions in Hounslow — structural underpinning design, waterproofing...
Chartered structural engineer calculations for every residential intervention in Hounslow — steel beams, lintels, pad foundations, wall re...
Measured surveys across Hounslow — floor plans, elevations and sections to ±3mm accuracy. Leica Disto laser + BLK360 point-cloud scanning,...
End-to-end Party Wall Act 1996 service for Hounslow — Section 1, 3 and 6 notices, schedule of condition surveys, party wall award coordina...
London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Hounslow property,...


Housing stock: 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.
Notable conservation areas: Chiswick, Bedford Park, Old Isleworth, Brentford

A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessib...
Every loft type across every Hounslow roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regu...
The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical p...
Hounslow's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in ...
Turn your unused Hounslow garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulati...
Full architectural technology service for basement digs and cellar conversions in Hounslow — structural underpinning design, waterproofing...
Chartered structural engineer calculations for every residential intervention in Hounslow — steel beams, lintels, pad foundations, wall re...
Measured surveys across Hounslow — floor plans, elevations and sections to ±3mm accuracy. Leica Disto laser + BLK360 point-cloud scanning,...
End-to-end Party Wall Act 1996 service for Hounslow — Section 1, 3 and 6 notices, schedule of condition surveys, party wall award coordina...
London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Hounslow property,...
Leave your number and an Architectural technologist covering Hounslow will call you back within 30 minutes during working hours.

Every Hounslow postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. Hounslow fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| TW3 | Hounslow | 1930s semi-detached, post-war flats | A drawing package at an TW3 address in Hounslow is determined by Hounslow Council under its own Local Plan policies for Hounslow. |
| TW4 | Hounslow West | Edwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in Brentford | A drawing package at an TW4 address in Hounslow West is determined by Hounslow Council under its own Local Plan policies for Hounslow West. |
| TW5 | Heston / Cranford | Edwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in Brentford | A drawing package at an TW5 address in Heston / Cranford is determined by Hounslow Council under its own Local Plan policies for Heston / Cranford. |
| TW7 | Isleworth | Georgian and Victorian terraces | Isleworth sits wholly inside TW7, so Hounslow Council validates every drawing package submitted from an TW7 address. |
| TW8 | Brentford | Georgian fragments, Victorian terraces, new-build | Brentford sits wholly inside TW8, so Hounslow Council validates every drawing package submitted from an TW8 address. |
| TW13 | Feltham | 1930s semi-detached, post-war estates | TW13 covers Feltham only; Hounslow Council handles the drawing package, and Feltham case officers apply the TW13 conservation-area map. |
| TW14 | Feltham / East Bedfont | Edwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in Brentford | TW14 covers Feltham / East Bedfont only; Hounslow Council handles the drawing package, and Feltham / East Bedfont case officers apply the TW14 conservation-area map. |
| W3 | Acton | Victorian and Edwardian terraces | Acton is split at W3. Either Ealing Council or Hounslow Council can determine a drawing package here, so the W3 address is checked against both policies maps first. |
Roof pitch, wall build-up and plot depth change every few Hounslow streets, and each one changes what a drawing package can achieve at that address.
How designation changes a Hounslow drawing package: Hounslow Council maintains 30 conservation areas, including Bedford Park, Old Isleworth, Brentford. Inside any of them a Hounslow drawing package cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Old Isleworth sets the tone for Hounslow casework.
Hounslow permitted development status: there is no borough-wide direction from Hounslow Council, so a drawing package at a W4 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Hounslow sale to argue it later.
The building fabric around Hounslow: 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. A drawing package in Hounslow is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Hounslow Council.
Sources for this Hounslow 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.
Over the 12 quarters from 2023 Q2 to 2026 Q1, Hounslow decided 2,310 householder planning applications and approved 69.9% of them — 13.1 percentage points below the London average of 83%. That places Hounslow 31st of 32 London boroughs on householder approval rate. These are decisions the council reported to MHCLG, not our own sample.
| Measure | Hounslow | Context |
|---|---|---|
| Householder applications decided | 2,310 | 77,680 across London |
| Householder approval rate | 69.9% | 83% London average |
| Decided within 8 weeks | 91.2% | 20th fastest of 32 boroughs |
| Took longer than 13 weeks | 2.7% | the applications that overran the statutory target |
| Minor dwellings approval rate | 46.6% | new-build and conversion schemes under 10 units |
| All application types | 68.4% | across 3,929 decisions |
| Certificates of lawfulness issued | 1,352 | confirmations that work was permitted development |
Speed matters as much as the odds. Hounslow decided 91.2% of householder applications inside the eight-week statutory period and let 2.7% run past thirteen weeks. A drawing package that is complete and correctly described at validation is the part of that timeline you control; the rest belongs to the council's caseload.
Source: MHCLG District Planning Application Statistics (PS1 and PS2), 2023 Q2 to 2026 Q1, published quarterly by the Ministry of Housing, Communities and Local Government. Counts are decisions made in the window, not applications submitted. Contains public sector information licensed under the Open Government Licence v3.0.
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Get my free quote →We've delivered architectural drawings across every part of Hounslow. Each neighbourhood has its own conservation context and dominant housing stock — click through for area-specific guidance.