Mansard loft conversions in Bangor, Gwynedd and Anglesey

Covering Bangor, Gwynedd and Anglesey

Our coverage around Bangor, Gwynedd and Anglesey (LL57) also includes Llangefni (8 miles to the west) and Caernarfon.

Homes in Gwynedd and Anglesey

Housing in Wales ranges from terraced streets in the valleys and older industrial towns to stone-built homes in rural areas and modern estates around the cities.

What does a mansard loft conversion involve?

Mansards are a bigger structural job than other conversions because the roof is largely rebuilt. They normally need planning permission, and many councils have design guides setting the angle, materials and window style. We prepare the design to those guides and build in slate, lead and timber or approved alternatives.

Planning and building regulations checks under Welsh rules
Staircase, insulation and fit-out
En-suite, electrics and fire safety

How much does a mansard loft conversion cost in Bangor, Gwynedd and Anglesey?

Guide prices for mansard loft conversions, including VAT where it applies. Your fixed price is confirmed in writing after the survey.

Mansard loft conversions	Guide price incl. VAT
Rear mansard	£65,000 to £85,000
Front and rear (double) mansard	£80,000 to £110,000

Do you need permission for a mansard loft conversion in Bangor, Gwynedd and Anglesey?

In Wales the planning rules, including what counts as permitted development, are set by the Welsh Government, and Welsh building regulations differ in places from England’s. We check both against your house before drawings are finalised, and handle party wall notices where needed.

This needs full planning permission from your council in Wales. We prepare and submit the application and deal with the planning officer on your behalf.

What can affect a mansard loft conversion?

A mansard nearly always involves party walls on both sides of a terrace.
Council design guides often require natural slate and lead.

How does the project run?

Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
Free site visit. We measure up, look at access, drains and the structure, and talk through options and budget.
Drawings, approvals, written quote. We prepare the design, apply for the approvals it needs, and give you a fixed price in writing.
Construction and completion. One site lead co-ordinates every trade through to the building control certificate.

Questions about a mansard loft conversion in Bangor, Gwynedd and Anglesey

Why choose a mansard over a dormer?

A mansard gives more usable space and often fits a street better where neighbours already have one.

Will I need party wall agreements?

Very likely, as the work affects the walls shared with both neighbours on a terrace.

Do you work in Bangor, Gwynedd and Anglesey?

Yes. Bangor, Gwynedd and Anglesey is within our coverage for mansard loft conversions, along with nearby Llangefni and Caernarfon.

Mansard loft conversions near Bangor, Gwynedd and Anglesey

Learn more about mansard loft conversions, or see every project we cover in Bangor.