Extensions in Chalk Farm: design, planning and build
Every type of house extension in Chalk Farm, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsN1C, N7, NW1, NW3, NW5, NW8
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Chalk Farm
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.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Guide prices for Chalk Farm
We publish guide prices so you can budget before anyone visits. For Chalk Farm they are adjusted by ×1.3, the factor we use across London.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
Covering Chalk Farm and nearby
Across N1C, N7, NW1, NW3, NW5, NW8, we can visit, measure and advise. We also work in nearby Camden Town (0 miles), Holloway (1 mile), Kilburn (2 miles), Highbury (2 miles), Cricklewood (3 miles). Borehamwood, in Hertfordshire, is roughly 9 miles from Chalk Farm and also on our list.
What works best for Chalk Farm 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.
The types we would usually look at first for a home in Chalk Farm are kitchen extensions, side return extensions and glass box extensions, depending on the garden and how the house is laid out.
All extension types we build in Chalk Farm
- Utility and boot room extensions · from £18,000
- Bungalow extensions · from £34,000
- Timber frame extensions · from £27,000
- Extension plans and drawings · from £1,550
- Orangery extensions · from £39,000
- Side extensions · from £28,500
- Single-storey rear extensions · from £27,000
- Home office extensions · from £20,500
- Building regulations for extensions · from £1,150
- Flat roof extensions · from £27,000
- Wraparound extensions · from £46,500
- Conservatory replacement extensions · from £26,000
- Side return extensions · from £23,000
- Bedroom extensions · from £33,500
- Planning permission for extensions · from £450
- Glass box extensions · from £39,000
- Porch extensions · from £5,200
- Extensions over a garage · from £31,000
- Pitched roof extensions · from £28,500
- Kitchen extensions · from £35,000
- Annexe extensions · from £71,500
- Double-storey extensions · from £49,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Chalk Farm
How much does an extension cost in Chalk Farm?
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.
How long does an extension take in Chalk Farm?
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.
Do I need planning permission for an extension in Chalk Farm?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Chalk Farm, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Chalk Farm
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.