DOUBLE STOREY EXTENSIONS
Twice the space, one set of foundations
A bigger kitchen downstairs, a new bedroom or bathroom upstairs. Building over two floors is the best value per square metre in extensions.
Why two storeys often beat one
The expensive parts of any extension are the ground works and the roof. A double storey extension shares both across two floors, which is why it costs roughly 40 to 50 percent more than a single storey, not double. If your household needs bedrooms as well as living space, it is usually the smarter spend.
Side extensions over the driveway are the classic Nottingham double storey project, especially on 1930s to 1960s semis. Rear double storeys work well on detached homes with garden to spare.
What it costs in Nottingham
| Typical cost (40m² over two floors) | £60,000 – £88,000 |
| Per square metre | £1,500 – £2,200 |
| Time on site | 14 – 20 weeks |
Add bathroom or kitchen fit-out on top; they are the spend people underestimate. Full breakdowns in our Nottingham extension cost guide.
Planning permission: usually needed
Most double storey extensions need a householder planning application, and side extensions facing the street get the closest look from planners on matching materials, roof lines and neighbour impact. Approval rates are still high for well-designed schemes. We design and submit with the local policies in mind, whether that is Nottingham City, Gedling, Broxtowe or Rushcliffe.
Frequently asked questions
Will we need to move out during the build?
Usually not. The new structure goes up outside the existing house and we break through late in the programme, so disruption is concentrated into a few weeks rather than months.
Do double storey extensions need matching brick?
Planners normally expect it, and a good brick match is what makes an extension look like it was always there. We source matches from reclaimed and special-order ranges; it is worth the effort.
What about the neighbours?
Semis and terraces usually involve the Party Wall Act. If your neighbours consent in writing it costs nothing; if surveyors get involved budget £1,000 or more per neighbour. We guide you through the notices.
Need bedrooms as well as living space?
Tell us what your family needs and we’ll tell you what two storeys would cost on your house.