HK Builders Ltd
Double Storey Extensions in Solihull
What is a double storey extension?
A double storey extension is a two-level addition that adds space both upstairs and downstairs on the same footprint. Because you build two floors on one set of foundations and one roof, you gain far more usable space for a relatively modest increase over a single storey extension.
The most common layout adds a larger kitchen or living space downstairs, with an extra bedroom and often an en-suite bathroom upstairs.
Why choose a double storey extension in Solihull?
- More additional space for the same footprint than a single storey extension.
- Better value per square metre, because the groundwork and roof costs are shared across two floors.
- Adds a bedroom and bathroom upstairs, not just living space downstairs, which is what buyers value most.
- FMB-registered, fully insured, with over 20 years building in Solihull and the surrounding areas.
How much does a double storey extension cost in Solihull?
| Double storey extension (typical total) | £55,000 to £120,000 |
|---|---|
| Single storey extension (for comparison) | £30,000 to £70,000 |
Figures are indicative UK ranges to help you budget and are not a quote. Actual costs depend on size, specification and site conditions.
The total depends on size, specification and the level of finish. Because the foundations and roof serve two floors, the cost per square metre is usually lower than a single storey extension.
Our process and timeline
- Step 1: Free consultation and site visit. We visit, measure up and discuss your plans and budget.
- Step 2: Design and drawings, including structural calculations. We prepare the drawings and the structural design for two floors.
- Step 3: Planning permission application. Double storey extensions are more likely to need full planning permission, and we manage the application.
- Step 4: Build. Groundwork, structure, roofing, first fix, second fix and finishing.
- Step 5: Sign-off and completion. Building control sign-off and a final walk-round with you.
Typical build time: 14 to 20 weeks on site (UK average), with the design and planning stage happening beforehand.
Do I need planning permission for a double storey extension in Solihull?
Double storey extensions are more likely to need full planning permission than single storey ones, because they more often exceed permitted development limits, particularly on height and how far they project. Proximity to a boundary or windows that overlook neighbouring properties are common triggers. We confirm the requirements for your property against Solihull Metropolitan Borough Council’s rules and handle the whole application for you.
Double storey extension FAQs
Do I need planning permission for a double storey extension in Solihull?
How long does a double storey extension take?
How much does a double storey extension cost in Solihull?
Is a double storey extension better value than a single storey?
Recent projects
You can see photographs of completed HK Builders projects, including extensions across the Solihull area, on our case studies page and in the gallery.
Get a free, no-obligation quote
Tell us about your project and we will arrange a free site visit and a clear, itemised quote. As FMB-registered builders based in the Solihull area, we manage the whole project from drawings to completion.