House Extensions in Cardiff
Cardiff Joiners are house extension specialists in Cardiff, building single-storey rear extensions, kitchen extensions, side return extensions, and wrap-around extensions across Pontcanna, Cyncoed, Roath, Penylan, Canton, Llandaff, Heath, and surrounding areas.
We manage the full project from structural work to finished joinery.
- Single-storey rear extensions and kitchen extensions
- Side return extensions: reclaiming the narrow alleyway
- Wrap-around extensions combining side return and rear
- Full structural work, all trades coordinated
- Complete carpentry fit-out: bi-fold doors, windows, flooring
Call 029 2010 1446 to arrange a free site visit.
Cardiff Properties: Extension Types That Work
Cardiff’s housing stock is well-suited to rear and side return extensions. We understand period housing, conservation area rules, and permitted development limits.
Single-Storey Rear Extensions
The most common extension across Cardiff. Creates a kitchen-diner by pushing the rear ground floor into the garden. Most run 3–4 metres in depth.
Victorian terraces in Pontcanna and Canton often have dark rear ground floors. A rear extension with bi-fold doors transforms the back of the house.
Kitchen Extensions
Combines the structural extension with a new kitchen installation as one coordinated project. Island placement, dining flow, and appliance positioning all affect the extension design.
Side Return Extensions
Victorian terraces in Pontcanna, Canton, and Roath have a narrow side return alleyway. Reclaiming this creates 2–3 metres of additional width. Enough for a kitchen island and a proper dining table.
Wrap-Around Extensions
Combines side return and rear into one L-shaped addition. In Pontcanna and Canton, a wrap-around can add 25–40m² of new ground-floor space.
Extensions for Cyncoed Detacheds
Larger rear gardens and more structural flexibility. Bifold walls opening to the garden, glass rooflines, or side extensions creating utility rooms and boot rooms.
Why Choose Cardiff Joiners for Your Extension
Full Scope Management
Foundations to fitted joinery. No split contracts. One invoice, one completion date.
Conservation Expertise
Familiar with Pontcanna, Canton, and Llandaff conservation area planning rules.
Building Regs Managed
Coordinated throughout. Inspections on schedule and sign-off on completion.
One Point of Contact
A single person manages your project from site visit through handover.
Get My Free Quote
Speak to a house extension specialist today
What’s Included in Our Extension Service
Our price covers the full scope. Unlike builders who quote the shell and leave finishing as extras.
Structural and Trade Work
Foundations, masonry, structural openings, roofing, all coordinated plumbing and electrical. No chasing separate contractors.
Full Carpentry Fit-Out
Bi-fold or sliding door installation, window fitting, first-fix, second-fix (skirting boards, architraves, door hanging), and any bespoke storage.
Project Management
Single point of contact, trade scheduling, quality control, and Building Regulations coordination throughout.
Waste Removal and Clean
Skip hire throughout, waste cleared as the project progresses, thorough final clean before handover.
House Extension Costs in Cardiff
Cardiff Joiners provides detailed written quotes. Call 029 2010 1446 for a precise quote.
Single-Storey Rear Extension
3–4m depth, standard finish. Typically £28,000–£45,000.
Kitchen Extension
Rear extension plus new fitted kitchen. Typically £38,000–£65,000.
Side Return Extension
Pontcanna or Canton Victorian terrace. Typically £22,000–£40,000.
Wrap-Around Extension
Side return plus rear, full fit-out. Typically £50,000–£85,000+.
Budget a 10% contingency. Victorian properties occasionally reveal foundation or drainage issues that cannot be identified before groundwork.
Get My Free Quote
Get a free house extension quote today
Our Extension Process
1. Free Site Visit
We visit your property, assess feasibility, discuss the brief, and talk through budget.
2. Design and Quote
Designs for Building Regulations. Detailed written quote covering everything.
3. During the Build
One point of contact throughout. Regular progress updates. Dust barriers to protect the rest of your home.
4. Completion and Handover
Final walkthrough, snagging addressed, thorough clean. A finished space ready to use from day one.
House Extensions Across Cardiff
We build extensions across Cardiff and the surrounding areas.
For the fitted kitchen in the new space, see our kitchen renovation page. For internal partitioning, see stud wall installation. For the deck that connects the extension to the garden, see our deck builders page. For the full renovation programme, see home renovation.
House Extension FAQs
Get My Free Quote
Fill in the form below for a free quote: