How much does a house extension cost in Wirral? +
Most single-storey rear extensions in Wirral cost between £40,000 and £80,000 depending on size, specification and finishes. A kitchen extension with bifold doors and a full fit-out typically sits between £55,000 and £75,000. CNR provides a fixed written quote upfront — no surprises and no escalating costs mid-project.
Do I need planning permission for a rear extension? +
Many single-storey rear extensions fall under Permitted Development rights and require no planning permission, as long as they meet size restrictions — generally no more than 3m beyond the original rear wall for semi-detached homes (or 4m for detached). CNR will advise you during your free site visit and manage any applications required.
How long does a house extension take to build? +
A typical single-storey rear extension takes 10–16 weeks from groundworks to final fit-out. Larger or more complex projects take longer. CNR gives you a realistic programme before work starts — not an optimistic one that slips every week.
What's included in your fixed price? +
Everything from foundations to finished room — groundworks, structural steel, brickwork, roofing, glazing, first and second fix electrics, plumbing, plastering, flooring and decorating. Kitchen and bathroom supply is also available through CNR. Building regulations sign-off is always included.
Do you handle building regulations sign-off? +
Yes — building regulations approval is included in every quote. We manage the full process with the local authority, including structural calculations, stage inspections and the final completion certificate. You won't need to deal with any of this yourself.
Which areas of Wirral do you cover? +
CNR Construction is based in Birkenhead and works across the whole of Wirral — including West Kirby, Heswall, Neston, Bebington, Bromborough, Wallasey, Moreton and Hoylake — as well as Chester, Ellesmere Port and surrounding areas. Not sure if we cover your postcode? Just call us.
Do you use subcontractors on my project? +
Every project is directly managed by Ollie. Where specialist trades are needed, we work with a select group of subcontractors we've built long-term working relationships with — people we trust completely and who are held to the same standards. One point of contact throughout, from first groundwork to sign-off.
Can I stay in my home during the build? +
In the vast majority of cases, yes. We section off the work area from the rest of your home, maintain safe access throughout the project, and leave the site clean and tidy at the end of every working day. Your project manager will walk through any specific considerations on the initial site visit.
Who are the best builders in Wirral? +
CNR Construction are consistently rated as one of the top building companies on the Wirral, with a 5.0 Google rating across 27 verified reviews. What sets us apart: every quote is fixed (no escalating costs), every project has one named manager on site from start to finish, and we work only with subcontractors we know and trust. We've delivered 72 projects across Wirral and Chester — from Heswall and West Kirby to Birkenhead and Bebington. The best way to judge a builder is to call and ask for references from recent jobs near you. We'll always provide them.
How do I find a reliable builder in Wirral? +
Look for three things: Google reviews with photos from named local clients, a fixed-price written quote before any work starts, and a builder who manages the project properly from start to finish. Unreliable builders quote low, then revise. They disappear mid-project and point at each other when problems arise. CNR Construction operates the opposite way — fixed price, one manager, trusted trades, building regs included. We cover the whole of Wirral and welcome visits to recent projects before you commit.
How much does it cost to hire a builder in Wirral? +
Costs vary significantly by project type. As a guide: a single-storey rear extension in Wirral typically costs £45,000–£80,000 depending on size and specification. A loft conversion runs £35,000–£65,000. A structural knock-through with steelwork starts around £15,000. New builds are priced per square metre — typically £1,800–£2,400/m² for a quality finish. CNR provides fully itemised fixed quotes at no charge, after a free site visit. You'll know the total cost before a single brick is laid.
