Covering Holyhead
Our coverage around Holyhead (LL65) also includes Llangefni, Caernarfon and Bangor.
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 do you get with a basement conversion?
A basement conversion turns an existing cellar into dry, usable rooms, or excavates a new basement under a house. Converting an existing cellar is far simpler and cheaper than digging a new one, and often does not need planning permission.
- Planning and building regulations checks under Welsh rules
- Underpinning or lowering the floor where needed
- Ventilation, heating and electrics
What will a basement conversion cost?
Use these ranges to budget for basement and cellar conversions; the survey turns them into a fixed price for the agreed specification.
| Basement and cellar conversions | Guide price incl. VAT |
|---|---|
| Existing cellar conversion | £1,900 to £3,000 per m² |
| New basement excavation | £4,200 to £6,600 per m² |
Do you need permission for a basement conversion in Holyhead?
Welsh projects need planning clearance from the council under Welsh rules, building regulations approval under the Welsh approved documents, and party wall notices where the work affects a neighbour’s wall or foundations.
In Wales an existing cellar conversion usually does not need planning permission; new excavation and lightwells may.
What should Holyhead homeowners check first?
- A pump for the drainage system needs a battery back-up.
- Headroom of about 2.1 m or more is needed, which may mean lowering the floor.
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.
- Free site visit. We measure up, look at access, drains and the structure, and talk through options and budget.
- Price and paperwork. The design is priced line by line, and we submit the planning and building control applications.
- Build and hand over. Our teams build to the programme, building control inspects, and you get the completion paperwork at the end.
Basement and cellar conversions: common questions
How much does a basement conversion cost?
Converting an existing cellar costs about £1,900 to £3,000 per square metre including VAT. A new excavated basement is around £4,200 to £6,600 per square metre.
Does a cellar conversion need planning permission?
Usually not if nothing changes outside. New basements and lightwells often do.
Do you work in Holyhead?
Yes. Holyhead is within our coverage for basement and cellar conversions, along with nearby Llangefni and Caernarfon.
Basement and cellar conversions near Holyhead
- Basement and cellar conversions in Llangefni
- Basement and cellar conversions in Caernarfon
- Basement and cellar conversions in Bangor
- Basement and cellar conversions in Pwllheli
Learn more about basement and cellar conversions, or see every project we cover in Holyhead.