Lytham St Annes, Lancashire
Semi-detached rear extension in Lytham St Annes
Single or two-storey extensions for semi-detached houses, with side access and one party wall. If you live in Lytham St Annes and want to know what a semi-detached rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover Lytham St Annes (FY8) as part of our Lancashire work. In Lytham St Annes we measure the attached neighbour's extension at the survey, because it often sets the sensible depth for yours.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a semi-detached rear extension cost in Lytham St Annes?
Guide prices for a semi-detached rear extension in Lytham St Annes start from our North West England rate of £1,790–£2,910 per square metre, including VAT. North West prices sit below our West Midlands baseline; access on terraced streets is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £21,500–£35,000 |
| 4 m wide × 5 m deep (20 m²) | £35,500–£58,500 |
| 4 m wide × 6 m deep (24 m²) | £43,000–£70,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a semi-detached rear extension in Lytham St Annes?
Planning for a semi-detached rear extension in Lytham St Annes follows the English householder rules.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Lytham St Annes like to extend?
Stone and brick terraces are common around Lytham St Annes. Where houses back onto a ginnel or alley, deliveries can come in from the rear, which makes the build tidier.
How a semi-detached rear extension in Lytham St Annes comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Semi-detached rear extensions near Lytham St Annes
We also build rear extensions for semi-detached houses in nearby Blackpool (5.6 miles) and Poulton-le-Fylde (6.3 miles).
- Semi-detached rear extension in Blackpool
- Semi-detached rear extension in Poulton-le-Fylde
- Semi-detached rear extension in Southport
- Semi-detached rear extension in Thornton-Cleveleys
- Semi-detached rear extension in Cleveleys
Other work in Lytham St Annes:
FAQ
Semi-detached rear extension questions in Lytham St Annes
Do you handle building control in Lytham St Annes?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
What postcode areas do you cover around Lytham St Annes?
Including FY8, and the surrounding Lancashire area.
What if my neighbour has already extended?
That can make a matching depth easier to justify. We measure theirs at the survey.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
Is the site visit in Lytham St Annes free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.