Side return extensions in Bangor, Gwynedd and Anglesey

Covering Bangor, Gwynedd and Anglesey

We work in Bangor, Gwynedd and Anglesey (LL57) and the places around it, including Llangefni, Caernarfon and Colwyn Bay.

Homes in Gwynedd and Anglesey

Welsh homes include long terraces built into hillsides, stone cottages and modern estates, and sloping sites often shape how and where an extension can go.

What is a side return extension?

A side return extension builds over the narrow passage that runs beside the back of many Victorian and Edwardian terraced houses, widening the kitchen or dining room by a metre or two. It is usually combined with a glazed or part-glazed roof so the deeper room still gets daylight.

Planning and building regulations checks under Welsh rules
Glazed or solid roof with rooflights
Underfloor heating ready screed if wanted

What is the guide price for a side return extension in Bangor, Gwynedd and Anglesey?

Use these ranges to budget for side return extensions; the survey turns them into a fixed price for the agreed specification.

Side return extensions	Guide price incl. VAT
Standard specification	£3,350 to £3,700 per m²
Good specification	£3,700 to £4,150 per m²
High specification	£4,150 to £4,550 per m²

Do you need permission for a side return extension in Bangor, Gwynedd and Anglesey?

Planning decisions in Wales are made by the local council, using permitted development rules set by the Welsh Government rather than England’s. Building regulations in Wales have their own approved documents, and the Party Wall etc. Act 1996 applies to work on shared walls and boundaries.

Wales has its own permitted development rules, set by the Welsh Government. Small single-storey rear extensions can often go ahead without an application, but the limits differ from England's and there is no larger-extension prior approval route, so we check the current Welsh rules for your house before drawings are finalised.

What should Bangor, Gwynedd and Anglesey homeowners check first?

Access is often through the house, so we plan deliveries and protect floors.
Glazed roofs need careful detailing against the neighbour’s wall.

From first call to completion

Send us the details. Give us a postcode, a rough idea of size and some photos, by phone, form or the guide price tool.
Survey at your house. We look at the existing structure, services and access, and agree what the design needs to achieve.
Drawings, approvals, written quote. We prepare the design, apply for the approvals it needs, and give you a fixed price in writing.
Build and hand over. Our teams build to the programme, building control inspects, and you get the completion paperwork at the end.

Questions about a side return extension in Bangor, Gwynedd and Anglesey

How much does a side return extension cost?

Usually about £3,350 to £4,550 per square metre including VAT, which works out at around £35,000 to £55,000 for a typical side return before the kitchen.

Is a glazed roof too hot in summer?

Modern solar-control glass and a mix of glazed and solid roof keep it comfortable. We advise on the balance during design.

How do I get a price for side return extensions in Bangor, Gwynedd and Anglesey?

Use the guide price tool for a ballpark figure, then book a visit for a fixed written price for the agreed specification.

Other towns nearby

Learn more about side return extensions, or see every project we cover in Bangor.