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Hounslow Council

Architectural technology in Hounslow

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.

Hounslow at a glance

Planning authority
Hounslow Council
Population
288,000
Conservation areas
30
Article 4 Direction
No borough-wide
Postcodes
W3, W4, TW3, TW4, TW5, TW7, TW8, TW13, TW14
Typical housing
Edwardian villas in Chiswick and Turnham Green

Technical drawings reviewed on tablet — architectural drawings in Hounslow
Services available in Hounslow

Every architectural service in Hounslow — one chartered team.

Planning Drawings in Hounslow

Building Regulations Drawings in Hounslow

A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessib...

Loft Conversions in Hounslow

Every loft type across every Hounslow roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regu...

House Extensions in Hounslow

The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical p...

Mansard Roof Extensions in Hounslow

Hounslow's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in ...

Garage Conversions in Hounslow

Turn your unused Hounslow garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulati...

Basement Conversions in Hounslow

Full architectural technology service for basement digs and cellar conversions in Hounslow — structural underpinning design, waterproofing...

Structural Calculations in Hounslow

Chartered structural engineer calculations for every residential intervention in Hounslow — steel beams, lintels, pad foundations, wall re...

Measured Building Surveys in Hounslow

Measured surveys across Hounslow — floor plans, elevations and sections to ±3mm accuracy. Leica Disto laser + BLK360 point-cloud scanning,...

Party Wall Services in Hounslow

End-to-end Party Wall Act 1996 service for Hounslow — Section 1, 3 and 6 notices, schedule of condition surveys, party wall award coordina...

Rear Dormer Loft Conversions in Hounslow

London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Hounslow property,...

Hounslow planning context

Planning in Hounslow

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

An architectural technologist checking a printed set of house drawings, marking a proposed elevation in red — architectural technology in Hounslow
Every set is checked line by line against the validation checklist before it leaves the office.
Nearby boroughs

Boroughs adjacent to Hounslow

Edwardian terraced houses in Chiswick W4
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All services in Hounslow

What we do in Hounslow

Planning Drawings in Hounslow

Building Regulations Drawings in Hounslow

A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessib...

Loft Conversions in Hounslow

Every loft type across every Hounslow roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regu...

House Extensions in Hounslow

The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical p...

Mansard Roof Extensions in Hounslow

Hounslow's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in ...

Garage Conversions in Hounslow

Turn your unused Hounslow garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulati...

Basement Conversions in Hounslow

Full architectural technology service for basement digs and cellar conversions in Hounslow — structural underpinning design, waterproofing...

Structural Calculations in Hounslow

Chartered structural engineer calculations for every residential intervention in Hounslow — steel beams, lintels, pad foundations, wall re...

Measured Building Surveys in Hounslow

Measured surveys across Hounslow — floor plans, elevations and sections to ±3mm accuracy. Leica Disto laser + BLK360 point-cloud scanning,...

Party Wall Services in Hounslow

End-to-end Party Wall Act 1996 service for Hounslow — Section 1, 3 and 6 notices, schedule of condition surveys, party wall award coordina...

Rear Dormer Loft Conversions in Hounslow

London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Hounslow property,...

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Architectural technology in Hounslow — the exterior of a London house before works
The exterior of a london house before works — architectural technology in Hounslow.

Where in Hounslow does a drawing package actually get determined?

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.

PostcodeAreaDominant stockWhat it means for a drawing package
TW3Hounslow1930s semi-detached, post-war flatsA drawing package at an TW3 address in Hounslow is determined by Hounslow Council under its own Local Plan policies for Hounslow.
TW4Hounslow WestEdwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in BrentfordA drawing package at an TW4 address in Hounslow West is determined by Hounslow Council under its own Local Plan policies for Hounslow West.
TW5Heston / CranfordEdwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in BrentfordA drawing package at an TW5 address in Heston / Cranford is determined by Hounslow Council under its own Local Plan policies for Heston / Cranford.
TW7IsleworthGeorgian and Victorian terracesIsleworth sits wholly inside TW7, so Hounslow Council validates every drawing package submitted from an TW7 address.
TW8BrentfordGeorgian fragments, Victorian terraces, new-buildBrentford sits wholly inside TW8, so Hounslow Council validates every drawing package submitted from an TW8 address.
TW13Feltham1930s semi-detached, post-war estatesTW13 covers Feltham only; Hounslow Council handles the drawing package, and Feltham case officers apply the TW13 conservation-area map.
TW14Feltham / East BedfontEdwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in BrentfordTW14 covers Feltham / East Bedfont only; Hounslow Council handles the drawing package, and Feltham / East Bedfont case officers apply the TW14 conservation-area map.
W3ActonVictorian and Edwardian terracesActon 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.

How does a drawing package differ street by street across Hounslow?

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 do conservation areas and Article 4 affect a drawing package in Hounslow?

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.

Which neighbouring authorities border Hounslow?

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.

What are the chances of approval in Hounslow?

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.

69.9%of householder applications approved
1,615approved in Hounslow
695refused over the same period
91.2%decided within 8 weeks
Hounslow planning decisions, 2023 Q2 to 2026 Q1
MeasureHounslowContext
Householder applications decided2,31077,680 across London
Householder approval rate69.9%83% London average
Decided within 8 weeks91.2%20th fastest of 32 boroughs
Took longer than 13 weeks2.7%the applications that overran the statutory target
Minor dwellings approval rate46.6%new-build and conversion schemes under 10 units
All application types68.4%across 3,929 decisions
Certificates of lawfulness issued1,352confirmations 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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Neighbourhoods we cover in Hounslow

7 Hounslow neighbourhoods

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.

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