An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Landlords in Northampton (NN1, NN2 and NN5) 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. With students as well as working sharers renting in Northampton, we plan bigger jobs for the gap between academic-year tenancies where we can.
- Area
- Northamptonshire, England
- Postcodes
- NN1, NN2 and NN5
- Location
- 29 miles east of Coventry
- Council
- West Northamptonshire Council
- Pricing region
- East Midlands
What do extensions for extra rooms in Northampton involve?
- Heating, insulation and glazing
- Party wall coordination where needed
- Ensuite drainage and extraction
- Planning route check and drawings
- Fire separation and detection extended to the new space
Which rules apply in Northampton?
The rules below are the England-wide position for this kind of work. Councils add their own standards and schemes on top, so we always check the address in Northampton before we price.
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
- A conversion can be a material change of use under the building regulations, so confirm with building control before work starts.
- 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.
West Northamptonshire Council: local HMO schemes
| Article 4 (HMO) | In force in part of the council area Article 4 directions cover several areas of Northampton (from 2011 onwards). |
|---|---|
| Additional licensing | In force in part of the council area Additional licensing in 20 wards across Northampton and Daventry 24 Feb 2025-23 Feb 2030 (replaced 2020-2025 scheme). |
| Selective licensing | No scheme found |
Schemes change. Check the council’s current pages for the exact address in Northampton before you buy or start work. Source: West Northamptonshire Council HMO licensing page, checked 2026-10-31.
How much do extensions for extra rooms cost in Northampton?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £33,950 – £58,200 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £1,750 – £3,900 | m² |
Prices in Northampton are shown with our regional adjustment for East Midlands (below 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 Northampton, tell us at the first call so the programme is built around it.
For student houses in Northampton, booking by spring is the safest way to make the summer gap.
When do Northampton landlords need it?
Typical reasons for this work in Northampton:
- Adding a ground-floor room
- A kitchen too small for the number of sharers
Questions about extensions for extra rooms in Northampton
Do you handle building control?
Yes, from application to completion certificate.
Which postcodes in Northampton do you work in?
All of them, including NN1, NN2 and NN5, and the surrounding parts of Northamptonshire.
Which council covers HMOs in Northampton?
Northampton is covered by West Northamptonshire 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 Northampton?
Our guide ranges for East Midlands 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 Northampton
- Wellingborough · 9 mi
- Daventry · 12 mi
- Rushden · 12 mi
- Kettering · 12 mi
- Milton Keynes · 15 mi
- Market Harborough · 16 mi
- All of Northamptonshire
Other HMO services in Northampton
- Loft conversions for extra rooms in Northampton
- Communal kitchen refits in Northampton
- Layout changes and room reconfiguration in Northampton
- Large HMO conversions (7+ sharers) in Northampton
- Ensuite installation in Northampton
- House to HMO conversion in Northampton
- Rewires and EICR remedials in Northampton
- Student HMO refurbishment in Northampton