Two-storey extensions for semi-detached houses in Ashby-de-la-Zouch
Adding a two-storey extension for a semi-detached house in Ashby-de-la-Zouch gives you two new rooms stacked on one footprint. Here's how we'd approach it, what it typically costs and the rules that apply in England.
What we'd confirm first for a project in Ashby-de-la-Zouch.
- Postcode districts
- LE65
- County / area
- Leicestershire, England
- Price region
- East Midlands
- Guide price
- £55,000–£74,000 (£1,960–£2,650 per m²)
- Approval route
- Depends on position: a two-storey rear extension may be permitted development (3 m deep, 7 m from the rear boundary); a two-storey side extension needs planning permission.
- Nearest towns
- Swadlincote (4 miles), Coalville (4.6 miles), Shepshed (7.8 miles)
- Distance to Leicester
- about 16.1 miles
- First visit
- Free, no obligation
About a two-storey extension for a semi-detached house
A two-storey extension for a semi-detached house is a two-floor addition to the rear, the open side, or both, designed around the attached neighbour on one side. The rear is often the simplest option and can sometimes be permitted development, while a side extension uses the gap on the detached side. Both need care with the shared party wall and the neighbour's light.
Around Ashby-de-la-Zouch we also work in Swadlincote, Coalville and Shepshed, and across the rest of Leicestershire. Postcode district in and near Ashby-de-la-Zouch: LE65.
What it costs in Ashby-de-la-Zouch
In the East Midlands, which includes Ashby-de-la-Zouch, we'd expect a two-storey extension for a semi-detached house to cost around £55,000–£74,000 for a 4 m × 3.5 m footprint on two floors (28 m² of new floor space), or £1,960–£2,650 per m² including VAT. Design fees, structural calculations and approval fees are separate and listed on our prices page.
| Spec | Per m² | A 4 m × 3.5 m footprint on two floors (28 m² of new floor space) |
|---|---|---|
| Essential | £1,800–£2,430 per m² | £50,500–£68,000 |
| Standard | £1,960–£2,650 per m² | £55,000–£74,000 |
| Premium | £2,350–£3,180 per m² | £66,000–£89,000 |
Planning and building regulations in Ashby-de-la-Zouch
In England, a two-storey rear extension on a semi can be permitted development if it goes no more than 3 m beyond the original rear wall and stays 7 m from the rear boundary, with matching materials and roof pitch. A two-storey side or wraparound extension always needs planning permission, costing £548 (or £575 for applications made from 8 December 2026). Protected areas such as conservation areas exclude two-storey rear permitted development.
Approval in England: Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
Building regulations: Building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end.
Design points for Ashby-de-la-Zouch homes
Rear, side or both
On a semi, a rear extension sits against the attached neighbour, while a side extension faces the detached neighbour and the street. We compare the space, cost and approval route for each, and for a wraparound, before you commit to one design.
The attached neighbour's light
A two-storey rear extension next to the party wall can take light from the neighbour's rear windows. Councils often use a 45-degree test, so the first floor may need to be shorter than the ground floor or set in from the shared boundary.
How we'd run your project
Free site visit
We visit your home in Ashby-de-la-Zouch, look at the structure, access and boundaries, and talk through what you want the new rooms to do.
Get it approved
Once you're happy with the design we submit it to the council for Ashby-de-la-Zouch and deal with any questions from the planning officer.
Engineer it
Foundations sized for two floors, steels for any openings, and building control approval, all before anyone starts on site.
Build it
The new structure goes up first, then we open into the house, finish inside and get the completion certificate.
Questions about two-storey extensions for semi-detached houses in Ashby-de-la-Zouch
Which postcodes do you cover around Ashby-de-la-Zouch?
We cover Ashby-de-la-Zouch (LE65) and nearby places including Swadlincote, Coalville and Shepshed, plus the rest of Leicestershire. The first site visit is free.
How much does a two-storey extension for a semi-detached house cost in Ashby-de-la-Zouch?
Our guide for the East Midlands, which covers Ashby-de-la-Zouch, is £1,960–£2,650 per m² including VAT. A typical project with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) comes to about £55,000–£74,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Do I need planning permission for a two-storey extension for a semi-detached house in Ashby-de-la-Zouch?
Ashby-de-la-Zouch is in England, so England planning rules apply. Depends on position: a two-storey rear extension may be permitted development (3 m deep, 7 m from the rear boundary); a two-storey side extension needs planning permission. If in doubt, a lawful development certificate or a planning application gives you certainty before you build.
Does a two-storey extension add value to a semi-detached house?
It usually adds value, but the gain is never certain. Nationwide's 2025 research found that 10% more floor area was linked to about 5% higher value, and that adding a double bedroom and bathroom to a three-bed, one-bathroom house could add up to 24%. Every street has a ceiling price, so check local sales first.
Should I extend my semi to the side or the rear?
It depends on your plot and what you need. A rear extension keeps the side drive and can sometimes be permitted development, but it affects the attached neighbour. A side extension keeps the rear garden but always needs planning permission in England. We compare both at the free site visit.
Nearby
We also cover places near Ashby-de-la-Zouch, including:
Other extensions in Ashby-de-la-Zouch
- Rear
- Side
- Wraparound
- Part two-storey
- Over a garage
- First floor
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Ashby-de-la-Zouch · Two-storey extensions for semi-detached houses across Leicestershire
Tell us about your house in Ashby-de-la-Zouch and we'll call you back to arrange a free, no-obligation visit.