Rear extension drawings in Hillingdon
A rear extension on a Hillingdon semi or terrace can go 3 metres back without an application, and up to 6 metres through prior approval, a route the council has granted in 73% of the cases where it found approval was required (our analysis of MHCLG planning application statistics, table PS1). DrawingsDirect draws rear extensions in Hillingdon from £695.
Fixed fee from £495 drawings + £200 survey (£695 total) · all prices
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Why prior approval is worth a look in Hillingdon
Both depths come from the permitted development rules for a single-storey rear extension on a house that is not detached (GPDO 2015, Schedule 2, Part 1, Class A).
Across the eight quarters to 2026 Q2 Hillingdon found prior approval was required on 71 larger home extension notifications and granted 73% of those (our analysis of MHCLG planning application statistics, table PS1). Many more notifications were cleared without that closer look; the statistics record those as prior approval not required, outside the 73%. For a semi-detached or terraced house that wants a deeper kitchen or living room, that is a record we consider seriously. Our prior approval guide explains the process, including how neighbours are consulted.
When a full householder application fits better
Prior approval covers single-storey rear extensions only. A second storey, a side extension or a combined scheme that goes beyond the permitted development limits needs the wider householder route.
Hillingdon decided 1,147 householder applications in the four quarters to 2026 Q2 and granted 90% of them (our analysis of MHCLG planning application statistics, table PS2). That figure covers a mix of schemes and is not a forecast for yours, but it shows the council grants most householder applications that reach a decision. Our loft conversion drawings page covers the roof-level work that often goes with an extension.
Hillingdon decided 1,147 householder applications in the four quarters to 2026 Q2 and granted 90% of them (our analysis of MHCLG planning application statistics, table PS2).
Designations that can override the defaults
There are 42 Hillingdon entries on the government's national conservation-area register (our analysis of the MHCLG Planning Data Platform conservation-area dataset). Permitted development rights are narrower inside a conservation area, and Article 4 directions can remove rights elsewhere.
Check both, starting with Hillingdon Council's conservation area map, before you spend money on design. Our Article 4 direction guide shows how.
Fees at a glance
From 1 April 2026 the council charges £548 for a householder application for an extension and £249 for a prior approval for a larger rear extension. Our rear extension drawings start from £695, and every other fixed fee is on the pricing page.
The Hillingdon figures come from the government's planning application statistics.
Ask for a fixed quote
Use the form on this page with your address and the depth you have in mind. We say which route fits and what the drawing set will include; see our rear extension drawings page for a typical set.
Sources
Every figure on this page, where it comes from and a link to the original.
| Figure | Source | Link |
|---|---|---|
| 1,147 | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 90% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 71 | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 73% | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 42 | 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
Do I need planning permission for a rear extension in Hillingdon?
Can you draw a loft extension in Hillingdon at the same time?
What do rear extension drawings cost in Hillingdon?
Photographs: Lewis Clarke (CC BY-SA 2.0); Derek Harper (CC BY-SA 2.0).
