House Extensions Wirral

House Extensions across
Wirral & Chester.

CNR Construction builds house extensions across Wirral and Chester — rear extensions, side extensions, wrap-around extensions and double-storey extensions. Fixed price. In-house team. Free site visit. Building regs included.

House extension Wirral — completed rear extension with bifold doors by CNR Construction
Why CNR

One team. One price.
Start to finish.

CNR Construction has been building house extensions across Wirral since 2013. Every project — regardless of size or type — is delivered by our own in-house team. No subcontractors. No separate groundwork company. No glazing contractor arriving after we've left and billing separately.

That means one fixed price covers everything: groundworks, foundations, structural steelwork, brickwork, roofing, glazing, internal fit-out, electrics, plumbing and building regulations sign-off. The number in your quote is the number on your final invoice.

We've delivered over 72 projects across Wirral since 2013. Our 5.0 Google rating reflects what actually happens when you work with us — not what we say on a brochure.

72
Projects Completed
5.0
Google Rating
11+
Years on Wirral
Fixed
Price — always

House extension types we build across Wirral.

Rear Extensions

The most common house extension across Wirral. A single-storey rear extension typically transforms a cramped kitchen into an open-plan kitchen-diner with bifold doors and direct garden access. CNR builds rear extensions from groundworks to kitchen fit-out on one fixed price — including building regulations sign-off.

Side Return Extensions

Side return extensions fill in the gap between your home and the boundary wall — particularly suited to Victorian and Edwardian terraces throughout Birkenhead, Wallasey and Bebington. Often combined with a rear extension, a side return dramatically increases the width of your kitchen or ground-floor living space.

Wrap-Around Extensions

A wrap-around combines a rear extension with a side return — creating an L-shaped addition that maximises ground-floor space in a single project. This is one of the most transformative extension types on Wirral for the right property, and CNR has delivered several across the peninsula.

Double-Storey Extensions

A double-storey rear or side extension adds ground-floor living space and first-floor bedrooms simultaneously. More cost-effective per square metre than two separate projects. Planning permission is always required. CNR advises on the planning route and can manage the application as part of the project.

House extension costs across Wirral, 2026.

Extension TypeTypical CostNotes
Single-storey rear (basic)£40,000 – £55,000Standard brick, basic glazing, no kitchen fit-out
Single-storey rear (full spec)£55,000 – £80,000Bifold doors, skylights, kitchen island, herringbone floor
Side return extension£35,000 – £60,000Depends on length and whether combined with rear
Wrap-around extension£65,000 – £100,000Rear + side, planning usually required
Double-storey rear extension£80,000 – £130,000Two floors, always requires planning permission

All CNR quotes are fixed price. These are real figures based on projects CNR has delivered across Wirral — not national averages. Your fixed quote will be based on a site visit and full assessment of your property.

What's included in every CNR extension project.

Full groundworks & foundations
Structural steel in-house
All brickwork & roofing
Bifold or sliding doors
Roof skylights & glazing
Full internal plaster & decoration
Electrics & lighting
Plumbing & underfloor heating
Building regs sign-off
Kitchen fit-out available
Planning advice included
Fixed price — always

Common questions about house extensions in Wirral.

How much does a house extension cost in Wirral?
A single-storey rear extension in Wirral typically costs £40,000 to £80,000 depending on size and specification. A full-spec kitchen extension with bifold doors, skylights and kitchen fit-out runs £55,000 to £80,000. A double-storey extension costs £80,000 to £130,000. All CNR Construction quotes are fixed — the number you're quoted is the number you pay. See our full house extension cost guide for a detailed breakdown.
Do I need planning permission for a house extension in Wirral?
Most single-storey rear extensions in Wirral fall under Permitted Development — no planning permission required — provided they stay within standard size limits: 3m from the original rear wall for semi-detached and terraced homes, 4m for detached. Double-storey extensions, wrap-around extensions and properties in conservation areas will usually require planning permission. CNR confirms your position on the free site visit.
How long does a house extension take in Wirral?
A typical single-storey rear extension in Wirral takes 10–16 weeks from groundworks to final handover. A larger double-storey or wrap-around extension takes 16–24 weeks. CNR provides a detailed programme before work starts so you know exactly what to expect at every stage.
Is groundwork included in CNR's extension quotes?
Yes, always. Foundations, drainage and all groundwork are included in every CNR Construction quote. We never price extensions above ground and leave groundworks as a separate 'to be confirmed'. You get a fixed price for the entire project — from the first spade in the ground to the last coat of paint.
Can you extend a Victorian terrace in Wirral?
Yes — Victorian and Edwardian terraces across Birkenhead, Wallasey and Bebington are among the most common extension projects CNR handles. We manage party wall agreements, structural calculations and building regs as part of the fixed-price contract. CNR advises on the most practical option on the free site visit.

House extensions across Wirral & Chester.

CNR serves homeowners across the whole of Wirral and into Chester. Find your area below.

Builders Birkenhead

Victorian and Edwardian terraces, rear extensions and knock-throughs in the heart of Wirral.

Builders Wallasey

Rear extensions and structural work on Wallasey's dense Victorian and Edwardian housing stock.

Builders Heswall

Wrap-around and double-storey extensions on Heswall's detached and large semi-detached homes.

Builders West Kirby

Rear extensions and loft conversions on West Kirby's Victorian, Edwardian and 1930s properties.

Builders Bebington

Extensions and structural work across Bebington's mixed housing stock.

Builders Bromborough

Rear extensions, loft conversions and groundwork in Bromborough and Eastham.

Get your free site visit
anywhere on Wirral.

CNR offers a free site visit across Wirral and Chester. We'll walk round your property, give you honest advice on the right extension type and — if you want to proceed — a fixed written quote with no hidden extras.

Book a Free Site Visit Call 07784 255380