House extension drawings in Hounslow
Hounslow council grants most house extensions that reach a decision: 79% of 689 householder applications in the four quarters to 2026 Q2 (our analysis of MHCLG planning application statistics, table PS2). DrawingsDirect prepares the drawings for kitchen, rear and home extensions across the borough, with rear extension drawings from £695.
Fixed fee from £495 drawings + £200 survey (£695 total) · all prices
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Kitchen and rear extensions in Hounslow
Many of the extensions homeowners ask about here are a kitchen pushed into the garden, a rear living space, or both. They look simple, but the council still needs existing and proposed floor plans, elevations, a site plan and a location plan before it can validate an application.
Our kitchen extension drawings page describes the set, and the rear extension drawings service covers the wider scope.
What the figures say about getting a decision
Hounslow granted 79% of the 689 householder decisions it made in the four quarters to 2026 Q2 (our analysis of MHCLG planning application statistics, table PS2).
Deeper single-storey extensions that use prior approval are counted another way. Over the eight quarters to 2026 Q2 the council found prior approval was required on 171 larger home extension notifications and granted 31% of those (our analysis of MHCLG planning application statistics, table PS1). Where the council said no prior approval was needed, the extension could go ahead, and those cases are left out of the 31%.
Neither figure predicts your outcome. They help us choose between a deeper prior approval and a householder application drawn to a modest depth.
The government's national register lists 43 conservation-area entries for Hounslow (our analysis of the MHCLG Planning Data Platform conservation-area dataset).
Permitted development depth and neighbours
A single-storey rear extension on a house that is not detached may be built 3 metres deep without an application. A larger home extension goes up to 6 metres once prior approval is granted (GPDO 2015, Schedule 2, Part 1, Class A, on legislation.gov.uk).
Where you share a wall with a neighbour you may also need to serve notices under the Party Wall Act; the party wall explainer shows the triggers.
Conservation areas and costs
The government's national register lists 43 conservation-area entries for Hounslow (our analysis of the MHCLG Planning Data Platform conservation-area dataset). Houses inside one face closer control of materials and design, so find your address on Hounslow Council's conservation area map first.
Statutory fees from 1 April 2026 are £548 for a householder extension application and £249 for a prior approval for a larger rear extension. Our rear extension drawings start from £695; the pricing page lists the others.
Tell us about your house
Give us the address and a few photos of the garden side of the house. We check the planning history, advise on the route and send a fixed fee. For Brentford, Chiswick, Isleworth and the rest of the borough the process is identical; our London areas page lists the postcode districts we cover.
Sources
Every figure on this page, where it comes from and a link to the original.
| Figure | Source | Link |
|---|---|---|
| 689 | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 79% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 171 | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 31% | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 43 | Our analysis of MHCLG Planning Data Platform conservation-area and article-4-direction datasets (bulk snapshot retrieved 14 Aug 2026) | www.planning.data.gov.uk |
| 3 metres | GPDO 2015 Sch 2 Pt 1 Class A.1(f)(i): single-storey rear extension max depth, house other than detached (source wording: 3 metres) | www.legislation.gov.uk |
| 6 metres | GPDO 2015 Sch 2 Pt 1 Class A.1(g): larger home extension (prior approval, A.4) max depth, house other than detached (source wording: 6 metres) | www.legislation.gov.uk |
| £548 | Statutory fee from 1 April 2026, SI 2012/2920 Sch 1 Pt 2 category 6(1): householder application for alterations or extensions to a single dwellinghouse | assets.publishing.service.gov.uk |
| £249 | Statutory fee from 1 April 2026: prior approval for a householder larger rear extension (GPDO Part 1 Class A) | assets.publishing.service.gov.uk |
| £695 | DrawingsDirect starting fixed fee for rear extension drawings, from the published price list | drawingsdirect.co.uk |
Questions people ask
How much do house extension drawings cost in Hounslow?
Do I need planning permission for a kitchen extension in Hounslow?
Do you cover Brentford and the rest of Hounslow?
Photographs: David Howard (CC BY-SA 2.0); David Hawgood (CC BY-SA 2.0).
