An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. For a house in Cambridge we start with a measured survey, check the council’s written HMO standards for the number of sharers, and then price each item separately. With students as well as working sharers renting in Cambridge, we plan bigger jobs for the gap between academic-year tenancies where we can.
- Area
- Cambridgeshire, England
- Postcodes
- CB21, CB22, CB23 and CB24
- Location
- 30 miles south-east of Peterborough
- Council
- Cambridge City Council
- Pricing region
- East of England
What do extensions for extra rooms in Cambridge involve?
- Fire separation and detection extended to the new space
- Planning route check and drawings
- Kitchen or bedroom fit-out
- Foundations, structure and roof
- Ensuite drainage and extraction
Which rules apply in Cambridge?
Here is what usually applies to a Cambridge job of this kind. It is general information rather than legal advice, and the council’s written HMO standards have the final detail.
- 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.
- Smoke alarms on every storey with living accommodation and CO alarms by fixed combustion appliances (other than gas cookers) are required by law.
- National rules ask for an adequate number of bathrooms, WCs and basins and suitably located kitchens; numeric ratios are set by each council.
Cambridge City Council: local HMO schemes
| Article 4 (HMO) | Proposed No small-HMO Article 4 direction in force; after a 2026 petition the council said (July 2026) it is building the case for one. No direction made yet. |
|---|---|
| Additional licensing | No scheme found |
| Selective licensing | No scheme found |
Schemes change. Check the council’s current pages for the exact address in Cambridge before you buy or start work. Source: Cambridge City Council HMO licensing page, checked 2026-10-31.
How much do extensions for extra rooms cost in Cambridge?
| 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 Cambridge 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?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in Cambridge, tell us at the first call so the programme is built around it.
If the house is let to students, we work backwards from the next tenancy start date in Cambridge.
When do Cambridge landlords need it?
We usually get the call when:
- A kitchen too small for the number of sharers
- Moving to more sharers with consent
Questions about extensions for extra rooms in Cambridge
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.
How far do you travel from Cambridge?
We cover the whole of Cambridgeshire and work UK-wide. For Cambridge the nearest towns on our list are Newmarket (13 miles), Ely (15 miles), Huntingdon (16 miles).
Which council covers HMOs in Cambridge?
Cambridge is covered by Cambridge City Council. We read the council’s written HMO standards before pricing, and you should check the licence position for the exact address.
How much do extensions for extra rooms cost in Cambridge?
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 Cambridge
- Newmarket · 13 mi
- Ely · 15 mi
- Huntingdon · 16 mi
- Haverhill · 16 mi
- Saint Neots · 16 mi
- Letchworth Garden City · 21 mi
- All of Cambridgeshire
Other HMO services in Cambridge
- Loft conversions for extra rooms in Cambridge
- Communal kitchen refits in Cambridge
- Layout changes and room reconfiguration in Cambridge
- Large HMO conversions (7+ sharers) in Cambridge
- Ensuite installation in Cambridge
- House to HMO conversion in Cambridge
- Professional and co-living HMO refurbs in Cambridge
- Small HMO conversions (3–6 sharers) in Cambridge