An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Landlords in Welwyn Garden City (AL8) usually come to us with a council letter, a fire risk assessment or a house they have just bought. We price from whichever you have.
- Area
- Hertfordshire, England
- Postcodes
- AL8
- Location
- 21 miles north of London
- Pricing region
- East of England
What do extensions for extra rooms in Welwyn Garden City involve?
- Fire separation and detection extended to the new space
- Building control completion
- Foundations, structure and roof
- Planning route check and drawings
- Kitchen or bedroom fit-out
Which rules apply in Welwyn Garden City?
Extensions for extra rooms in Welwyn Garden City must satisfy national law for England, the council’s written HMO standards and, where walls, drainage or fire separation change, the building rules. In short:
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
- Building regulations cover structural changes, new partitions, ensuite drainage, fire-resisting construction and notifiable electrical work.
- Smoke alarms on every storey with living accommodation and CO alarms by fixed combustion appliances (other than gas cookers) are required by law.
- Council standards often step up at 5 and 6 sharers, for example a separate WC at 5 and a second bathroom from 6.
How much do extensions for extra rooms cost in Welwyn Garden City?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £37,100 – £63,600 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £1,900 – £4,250 | m² |
Prices in Welwyn Garden City are shown with our regional adjustment for East of England (above the UK average). Your quote is itemised and fixed in writing once the scope and specification are agreed.
How long does it take?
Allow 8–14 weeks on site for a typical job. Drawings, approvals and long-lead items such as kitchens or fire door sets are booked before we start.
When do Welwyn Garden City landlords need it?
Typical reasons for this work in Welwyn Garden City:
- Adding a ground-floor room
- Moving to more sharers with consent
Questions about extensions for extra rooms in Welwyn Garden City
Is a kitchen extension worth it?
Often, when the existing kitchen limits how many people the council will allow. A bigger kitchen can unlock an extra room.
Do you cover all of Welwyn Garden City?
Yes. We work across Welwyn Garden City and the AL8 postcode areas, plus the rest of Hertfordshire. Nearby places we also cover include Hatfield, Hertford, St Albans.
Does a shared house in Welwyn Garden City need an HMO licence?
In England, a mandatory licence is needed for 5 or more people from 2 or more households. Smaller HMOs can need a licence where the council runs additional licensing, which is common in towns with many shared houses. Check the council’s website for the address.
How much do extensions for extra rooms cost in Welwyn Garden City?
Our guide ranges for East of England are in the table on this page, and the guide-price tool gives a figure for your house. A fixed written quote follows a free site visit.
Extensions for extra rooms near Welwyn Garden City
- Hatfield · 3 mi
- Hertford · 6 mi
- St Albans · 6 mi
- Harpenden · 7 mi
- Stevenage · 7 mi
- Potters Bar · 8 mi
- All of Hertfordshire
Other HMO services in Welwyn Garden City
- Loft conversions for extra rooms in Welwyn Garden City
- Communal kitchen refits in Welwyn Garden City
- Layout changes and room reconfiguration in Welwyn Garden City
- Large HMO conversions (7+ sharers) in Welwyn Garden City
- Ensuite installation in Welwyn Garden City
- House to HMO conversion in Welwyn Garden City
- Bedroom upgrades and room refits in Welwyn Garden City
- Full HMO refurbishment in Welwyn Garden City