Liverpool
House Extensions in Allerton
Local builders. Fixed-price quotes. 20-year structural guarantee. CNR Construction covers Allerton and the surrounding area.
House Extensions in Allerton
Allerton is an affluent south Liverpool suburb between Calderstones Park and the Allerton Road high street, with a mix of interwar and Victorian housing that attracts professional families. The area has a strong community identity and residents regularly extend to create the open-plan ground-floor living that modern family life requires.
What to expect building in Allerton
Calderstones Park is the central open space in Allerton, and properties on the roads bordering the park may have landscape sensitivity considerations worth checking in advance. The interwar semi-detached housing in Allerton is very similar in character and layout to the extension-friendly stock in Heswall or Greasby on Wirral, so we are well placed to quote and build here. CNR Construction covers Allerton from our Wirral base via the Mersey Tunnel, making south Liverpool a natural extension of our service area.
Typical housing stock in Allerton
Interwar semi-detached houses dominate the residential streets in central Allerton, particularly around Menlove Avenue, Rose Lane, and the roads off Allerton Road. Victorian and Edwardian detached properties are found on the wider, tree-lined roads closer to Calderstones Park. Most rear gardens offer enough depth for a single or double-storey extension without significantly reducing usable outdoor space.
CNR Construction are Wirral-based builders with over 15 years of experience across Merseyside. We cover Allerton as part of our wider service area. View our full house extensions service for details on everything we offer.
Extension Types We Build
- Single-storey rear extensions
- Double-storey rear extensions
- Side return extensions
- Wraparound extensions
- Open-plan kitchen-diner layouts
- Bifold and sliding door installations
- Vaulted ceilings and skylights
- Underfloor heating
What's Included
Every house extension we build in Allerton is fully managed from groundworks to final plastering.
Groundworks and Foundations
Excavation, drainage, and concrete footings built right from the start.
Structural Brickwork
Matching brickwork tied seamlessly into your existing property.
Roofing
Pitched, flat, or lantern roofs, weathertight and fully guaranteed.
Windows and Doors
Supply and fit of bifold doors, skylights, and Velux rooflights.
Insulation and First Fix
Fully insulated walls, floor, and roof to current building regulations.
Plastering
Skimmed smooth walls ready for your decorator.
Planning Permission in Allerton
Beyond those specific considerations, many single-storey rear extensions in Allerton fall within Permitted Development rights and do not require a planning application to Liverpool City Council. Standard PD limits are 3 metres beyond the original rear wall for semi-detached and terraced houses, and 4 metres for detached houses. Larger single-storey extensions of up to 6 metres or 8 metres may be possible under the Prior Approval scheme.
We confirm the planning position for every project before work begins. For a full breakdown of the rules, see our planning permission guide.
Our Guarantee
Every house extension we complete in Allerton is backed by our 20-year structural guarantee, provided in writing at handover. It covers structural integrity and workmanship from the date of practical completion and is transferable if you sell the property.
We also provide fixed-price written quotes before any work starts. What we quote is what you pay.
20 Years
Structural guarantee
15+
Years experience
50+
Projects completed
Fixed
Price quotes
Questions About House Extensions in Allerton
Do I need planning permission for a house extension in Allerton?
Some roads near Calderstones Park may have landscape sensitivity or conservation considerations. Liverpool City Council planning applies. Standard permitted development rules cover the majority of Allerton's residential streets. In general, single-storey rear extensions within the standard Permitted Development limits do not require a planning application to Liverpool City Council. The limit is 3 metres for semi-detached and terraced houses and 4 metres for detached houses. Larger extensions under the Prior Approval scheme may also be available depending on your specific property and location. We confirm the exact position before any work begins.
How much does a house extension cost in Allerton?
Costs in Allerton vary depending on the size, type, and specification of the project. A single-storey rear extension typically starts from around £1,500 to £2,000 per square metre for a well-built, fully insulated extension. CNR Construction provides a detailed fixed-price written quote before work starts, so you know the full cost upfront with no surprises.
How long does a house extension take to build in Allerton?
A single-storey rear extension typically takes 8 to 14 weeks on site once work begins. A double-storey extension may take 12 to 20 weeks depending on scope. We agree a programme before starting and keep you updated at every stage.
Do you cover Allerton?
Yes. CNR Construction are based in Wirral and cover Allerton and the surrounding areas of Liverpool. Call us on 07784 255380 or contact us online to arrange a free site consultation.
Also Covering Nearby Areas
We work across Allerton and the surrounding areas of Liverpool.
Get a Free Quote for Your Allerton Extension
We visit your property, discuss your plans, and provide a detailed written quote. No obligation, no pressure.