Pinner house extensions
We design and build house extensions for homes in Pinner and the surrounding Greater London area, with guide prices adjusted for the region.
- Postcode districtsHA2, HA5
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
What works best for Pinner houses?
London's housing is dominated by Victorian and Edwardian terraces, many with a rear outrigger and a side return, and 1930s semis in the outer boroughs. Conservation areas are common, so the planning check comes first.
Depending on the plot, kitchen extensions and side return extensions are often the strongest options, with wraparound extensions worth considering where there is room.
Popular extension prices in Pinner
Prices on this page use our London factor of ×1.3, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
Where we work near Pinner
Postcode districts we cover around Pinner include HA2, HA5. Nearby, we also take on projects in Wealdstone (2 miles), Ruislip (2 miles), Harrow (2 miles), South Ruislip (3 miles), Northolt (3 miles). Bushey, in Hertfordshire, is roughly 4 miles from Pinner and also on our list.
Planning rules in Pinner
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In England a single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Extension types and starting prices
- Orangery extensions · from £39,000
- Conservatory replacement extensions · from £26,000
- Pitched roof extensions · from £28,500
- Home office extensions · from £20,500
- Porch extensions · from £5,200
- Planning permission for extensions · from £450
- Utility and boot room extensions · from £18,000
- Kitchen extensions · from £35,000
- Side extensions · from £28,500
- Extension plans and drawings · from £1,550
- Bungalow extensions · from £34,000
- Building regulations for extensions · from £1,150
- Extensions over a garage · from £31,000
- Side return extensions · from £23,000
- Bedroom extensions · from £33,500
- Flat roof extensions · from £27,000
- Annexe extensions · from £71,500
- Double-storey extensions · from £49,000
- Timber frame extensions · from £27,000
- Wraparound extensions · from £46,500
- Single-storey rear extensions · from £27,000
- Glass box extensions · from £39,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Pinner
How much does an extension cost in Pinner?
Using our London factor (×1.3), a standard-spec single-storey extension of 20 m² is a guide £53,000 to £68,000 including VAT, and a 32 m² two-storey extension £74,500 to £98,000. Your written price follows the survey.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Pinner, and the guide-price tool gives a range for your own size and finish in about a minute.
How long does an extension take in Pinner?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Do I need planning permission for an extension in Pinner?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
Book a free site visit in Pinner
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.