Garage in Hounslow: Planning Permission Guide
A guide to building a garage in Hounslow under permitted development — rules, costs, and professional advice.
Based on 55 decided applications in Hounslow over 12 months (38 granted, 17 refused).
Hounslow has conservation areas around Chiswick (including the Bedford Park fringe shared with Ealing), Brentford, Isleworth, and Syon. Listed buildings are concentrated around Syon House, Osterley Park, Chiswick House, and Boston Manor. Article 4 Directions cover parts of Chiswick and Brentford. Flood zones apply along the Thames, particularly around Brentford and Isleworth. Heathrow noise contours affect some planning considerations in the west.
Recent garage decisions in Hounslow
The 5 most recent decided applications. Addresses redacted to postcode area.
Details of Condition 6 (Energy statement) submitted pursuant to planning permission P/2021/3809 dated 27/04/2022 For the demolition of ex…
Details of condition 7 (energy as-built) submitted pursuant to planning permission 00994/D/P1 (P/2021/3938) approved 08/04/2022 for the e…
Details of Drainage Assessment Form submitted pursuant to conditions 14 of permission P/2025/0901 dated 13/02/26 for erection of one bui…
Details of Biodiversity Gain Plan and Habitat Management and Monitoring Plan submitted pursuant to conditions 11 and 12 of permission P/2…
Details of Condition 26 (Highway works), 29 (Delivery and Servicing Plan), 30 (Travel Plan) and 36 (Road Safety Audit) submitted pursuant…
These are borough-wide. See the 5 nearest to your address.
Check your address freePermitted Development Rules
Buildings etc incidental to the enjoyment of a dwellinghouse
GPDO 2015, Schedule 2, Part 1, Class E
Garages fall under Part 1, Class E of the GPDO (the same class as outbuildings). They must be incidental to the enjoyment of the house.
Key dimension limits
These are the maximum GPDO limits for a detached house with no constraints. Your actual limits depend on your property type, location, and any planning restrictions.
Enter your postcode to see the personalised limits for your garage.
Check my limitsTypical Costs in London
Garage costs depend on size, whether it's attached or detached, and whether it includes electrics or additional rooms above.
Cost per m²
construction rate
Typical total
Based on 15–20 m²
Typically includes
Typically excludes
Single garage. Double garages and garages with rooms above will be significantly more.
Get a personalised cost estimate based on your actual garage dimensions.
Get my estimateWhich Professionals Do You Need?
A standard single garage can often be built from supplier designs. A garage with rooms above will need architectural and structural input.
A draughtsperson or architectural technician can prepare any drawings needed. A full architect may not be necessary.
Garden buildings and garages can often use supplier designs or simple drawings from a draughtsperson.
Typical fee: £500–£2,000 (Basic drawings)
A structural engineer may be needed if the garage has a room above or connects to the house.
Typical fee: £500–£1,500
May apply if the work is within 3 metres of a shared boundary. Check with your builder.
Typical fee: £700–£1,500 (per neighbour (if applicable))
This guidance is based on a typical semi-detached house with no special constraints. Listed buildings, conservation areas, and attached properties may require additional professional input.
Find out exactly which professionals you need for your garage.
Get personalised guidanceConservation Areas & Listed Buildings
In conservation areas, garages are subject to the same Class E rules. Consider using materials sympathetic to the area character.
Properties in conservation areas often have reduced permitted development rights. Some project types (like side extensions) lose PD rights entirely. An Article 4 Direction can remove additional PD rights.
Listed buildings (Grade I, II*, or II) have no permitted development rights at all. Any external alteration requires Listed Building Consent in addition to any planning permission. An architect experienced in heritage work is essential.
Check if your property is in a conservation area or has other planning constraints.
Check my propertyFrequently Asked Questions
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