- Nation
- England
- Pricing region
- East of England
- Postcode areas
- CB, PE, SG
- Main towns
- Peterborough, Cambridge, Wisbech, Saint Neots, Huntingdon
What do extensions for extra rooms in Cambridgeshire involve?
- Ensuite drainage and extraction
- Heating, insulation and glazing
- Fire separation and detection extended to the new space
- Party wall coordination where needed
- Kitchen or bedroom fit-out
- Building control completion
Which rules apply in Cambridgeshire?
- 3–6 unrelated sharers is use class C4; changing from a family house is usually permitted development unless an Article 4 direction applies.
- Building regulations cover structural changes, new partitions, ensuite drainage, fire-resisting construction and notifiable electrical work.
- Fire precautions follow a risk assessment; the LACORS Housing – Fire Safety guide (2008) is guidance, not law, but many councils base their standards on it.
- Council standards often step up at 5 and 6 sharers, for example a separate WC at 5 and a second bathroom from 6.
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
Councils in England can add additional licensing and Article 4 directions on top of the national rules. Check the council’s website for the exact address before you buy or start work.
How much do extensions for extra rooms cost in Cambridgeshire?
| 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 |
Typical time on site: 8–14 weeks. For a figure for your house, try the guide-price tool.
Extensions for extra rooms by town in Cambridgeshire
Questions about extensions for extra rooms in Cambridgeshire
Can I extend an HMO under permitted development?
Some extensions to houses are permitted development, but rules differ for HMOs and by nation and council. We check the address before design.
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 carry out extensions for extra rooms across Cambridgeshire?
Yes, across the whole of Cambridgeshire, including Peterborough, Cambridge, Wisbech.
Who licenses HMOs in Cambridgeshire?
HMOs in Cambridgeshire are licensed by the local council for the address. Where an area has several councils, each runs its own licensing and planning policies.
Other HMO services in Cambridgeshire
- Loft conversions for extra rooms in Cambridgeshire
- Communal kitchen refits in Cambridgeshire
- Layout changes and room reconfiguration in Cambridgeshire
- Large HMO conversions (7+ sharers) in Cambridgeshire
- Ensuite installation in Cambridgeshire
- House to HMO conversion in Cambridgeshire
- Shared bathroom and shower room refits in Cambridgeshire
- Small HMO conversions (3–6 sharers) in Cambridgeshire