What is a structural alteration?
A structural alteration changes how a house carries its loads, most often by removing a load-bearing wall and replacing it with a steel beam. It is how kitchens and dining rooms become open-plan, and how extensions are joined to the original house.
How much does a structural alteration cost in Northampton?
In Northampton, a structural alteration typically costs £4,250–£9,000 for a typical knock-through with steel beam, including VAT at 20% (standard rate). Building costs in the East Midlands run about 5% below the UK average, and the figures for Northampton are adjusted to reflect that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A typical knock-through with steel beam | £4,250–£9,000 |
| Higher specification | £9,000–£11,000 |
The main things that change the cost:
- Moving radiators, sockets and pipes
- Span of the opening
- What sits above the wall
- Flush or downstand beam
Your exact price depends on the survey and drawings. The guide price tool gives a quick range in the meantime.
Do you need planning permission for a structural alteration in Northampton?
Whether you need planning permission depends on your house and its location in England. In England removing a load-bearing wall does not need planning permission but does need building regulations approval with an engineer’s calculations. If the beam bears on a party wall, a party wall notice must be served.
Where work involves a shared wall, building on the boundary, or digging foundations within 3 metres of a neighbour’s building and deeper than its foundations (or within 6 metres for deeper work), the Party Wall etc. Act 1996 applies and notices must be served before work starts.
If the answer is not clear-cut, we can apply for formal confirmation before you commit to the build.
What we handle
Handled as part of most structural alterations:
- Building control sign-off
- Structural engineer’s calculations and drawings
- Fire protection to the steel
- Temporary propping
- Making good, plastering and flooring repairs
- Party wall notices where needed
How long does it take?
The build itself usually takes 1 to 2 weeks on site for a typical knock-through. Allow time beforehand for drawings and approvals, usually 6 to 12 weeks.
Building in Northampton
In the East Midlands, many estates built since the 1960s have integral garages that convert well into a study or bedroom.
If your home is in Northampton or close by in Wellingborough, Daventry and Rushden, a free home visit is the first step.
How it works
- 01
Free visit
We look at the property, talk through what you want and measure up. There is no charge and no obligation.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and sign-off
We run the build to a written programme and hand over the completion certificate.
Questions about structural alterations in Northampton
How do I know if a wall is load-bearing?
Only a survey can confirm it. Walls that carry floor joists, roof loads or walls above are load-bearing. We check on site and the engineer confirms.
Do I need a party wall notice?
In England and Wales, if the beam sits in a party wall, yes.
Who approves a structural alteration in Northampton?
Planning matters in Northampton go to the council covering your address, and the work needs building control approval. We prepare and submit the applications for you.
How long does a knock-through take?
Usually 1 to 2 weeks on site, plus a few days for plastering to dry.
How much does a structural alteration cost in Northampton?
In Northampton, a structural alteration typically costs £4,250–£9,000 for a typical knock-through with steel beam, including VAT at 20% (standard rate). Your fixed price depends on the survey and drawings.