House extensions in Benfleet
Looking to extend your home in Benfleet? Start here: extension types, guide prices for Benfleet, the planning rules that apply and how a project runs.
- Postcode districtsSS7, SS8, SS13
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Which extension suits a Benfleet home?
The East of England mixes market-town terraces, inter-war semis and modern estates. Clay soils are common in parts of the region, which can affect foundation design.
The types we would usually look at first for a home in Benfleet are single-storey rear extensions, double-storey extensions and bungalow extensions, depending on the garden and how the house is laid out.
Covering Benfleet and nearby
Our survey diary covers Benfleet, including SS7, SS8, SS13. The same team covers Hadleigh (2 miles), Canvey Island (2 miles), Rayleigh (3 miles), Wickford (4 miles), Basildon (5 miles), all within easy reach. Gravesend, in Kent, is roughly 11 miles from Benfleet and also on our list.
Benfleet extension prices at a glance
Prices on this page use our East of England factor of ×1.06, 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) |
|---|---|---|
| Double-storey extensions | 32 m² | £61,000 – £80,000 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
| Orangery extensions | 16 m² | £47,000 – £59,500 |
| Single-storey rear extensions | 20 m² | £43,000 – £55,500 |
| Conservatory replacement extensions | 14 m² | £31,500 – £41,000 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
Do extensions in Benfleet need planning permission?
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 return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
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).
Every extension type in Benfleet
- Bedroom extensions · from £27,500
- Home office extensions · from £16,500
- Kitchen extensions · from £28,500
- Wraparound extensions · from £38,000
- Bungalow extensions · from £27,500
- Side extensions · from £23,000
- Single-storey rear extensions · from £22,000
- Utility and boot room extensions · from £14,500
- Double-storey extensions · from £40,000
- Flat roof extensions · from £22,000
- Glass box extensions · from £31,500
- Annexe extensions · from £58,000
- Extensions over a garage · from £25,000
- Conservatory replacement extensions · from £21,000
- Building regulations for extensions · from £950
- Orangery extensions · from £31,500
- Porch extensions · from £4,200
- Pitched roof extensions · from £23,500
- Timber frame extensions · from £22,000
- Side return extensions · from £19,000
- Planning permission for extensions · from £350
- Extension plans and drawings · from £1,250
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
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
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Benfleet
How much does an extension cost in Benfleet?
Using our East of England factor (×1.06), a standard-spec single-storey extension of 20 m² is a guide £43,000 to £55,500 including VAT, and a 32 m² two-storey extension £61,000 to £80,000. Your written price follows the survey.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Do I need planning permission for an extension in Benfleet?
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.
How long does an extension take in Benfleet?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Benfleet, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Benfleet
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.