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 Dartford we start with a measured survey, check the council’s written HMO standards for the number of sharers, and then price each item separately.
- Area
- Kent, England
- Postcodes
- DA1 and DA2
- Location
- 15 miles east of London
- Pricing region
- South East
What do extensions for extra rooms in Dartford involve?
- Heating, insulation and glazing
- Planning route check and drawings
- Foundations, structure and roof
- Party wall coordination where needed
- Fire separation and detection extended to the new space
Which rules apply in Dartford?
Extensions for extra rooms in Dartford 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:
- 3–6 unrelated sharers is use class C4; changing from a family house is usually permitted development unless an Article 4 direction applies.
- 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.
- 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 Dartford?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £39,200 – £67,200 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £2,000 – £4,500 | m² |
Use these as a starting point for budgeting. Access, condition and the council’s requirements in Dartford can move the figure either way, which is why we quote after seeing the house.
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 Dartford landlords need it?
Typical reasons for this work in Dartford:
- Moving to more sharers with consent
- A kitchen too small for the number of sharers
Questions about extensions for extra rooms in Dartford
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
Which postcodes in Dartford do you work in?
All of them, including DA1 and DA2, and the surrounding parts of Kent.
Does a shared house in Dartford 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 Dartford?
Our guide ranges for South East 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 Dartford
- Bexley · 3 mi
- Swanley · 4 mi
- Welling · 5 mi
- South Ockendon · 5 mi
- Grays · 5 mi
- Thamesmead · 6 mi
- All of Kent
Other HMO services in Dartford
- Loft conversions for extra rooms in Dartford
- Communal kitchen refits in Dartford
- Layout changes and room reconfiguration in Dartford
- Large HMO conversions (7+ sharers) in Dartford
- Ensuite installation in Dartford
- House to HMO conversion in Dartford
- Void and between-tenancy refurbs in Dartford
- Licence condition and schedule-of-works in Dartford