In short: An HMO ensuite is a small private shower room, with a WC and basin, built into or next to a letting room. Across Cardiff, the work is planned around Wales’s HMO rules and the standards the local council publishes.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- CF
- Main towns
- Cardiff, Whitchurch
What does ensuite installation in Cardiff involve?
- Tanking and waterproof wall boards
- Shower, WC, basin and heated towel rail
- Stud partition or pod installation
- Survey of room size, drainage and water pressure
- Extractor fan with overrun
- Tiling, flooring and finishing
Which rules apply in Cardiff?
- England’s national room sizes do not apply in Wales; councils set their own room standards.
- Kitchen and bathroom ratios are set in each council’s HMO standards.
- Building regulations cover structural work, partitions, drainage, fire-resisting construction and electrics; confirm with building control whether the conversion is a material change of use.
- An electrical inspection and test at least every 5 years, with the report given to the contract-holder within 14 days.
Cardiff Council: local HMO schemes
| Additional licensing | In force in part of the council area Cathays: 1 Feb 2023 to 1 Feb 2028. Plasnewydd had a scheme from 1 Jan 2021; check with Cardiff Council whether it has been renewed. |
|---|---|
| Selective licensing | No scheme found |
Schemes change. Check the council’s current pages for the exact address in Cardiff before you buy or start work. Source: Cardiff Council HMO licensing page, checked 2026-10-31.
How much does ensuite installation cost in Cardiff?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Ensuite shower room added to a bedroom | £4,000 – £10,000 | £3,750 – £9,400 | ensuite |
| Shared bathroom refit | £5,500 – £9,000 | £5,150 – £8,450 | bathroom |
Typical time on site: 5–10 working days per ensuite. For a figure for your house, try the guide-price tool.
Ensuite installation by town in Cardiff
Questions about ensuite installation in Cardiff
Do ensuites need building control?
New drainage and extraction usually fall under the building regulations, so a building notice or competent-person self-certification is normally needed.
Can an ensuite go anywhere?
It needs a route for waste water. Gravity drainage is best; where that is not possible, a macerator or pump can work. We check at the survey.
Do you carry out ensuite installation across Cardiff?
Yes, across the whole of Cardiff, including Cardiff, Whitchurch.
Who licenses HMOs in Cardiff?
Cardiff council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Cardiff
- Shared bathroom and shower room refits in Cardiff
- Professional and co-living HMO refurbs in Cardiff
- Bedroom upgrades and room refits in Cardiff
- Rewires and EICR remedials in Cardiff
- House to HMO conversion in Cardiff
- Layout changes and room reconfiguration in Cardiff
- Licence condition and schedule-of-works in Cardiff
- Fire doors in Cardiff