Part single, part two-storey extensions in Worcester
Adding a part single, part two-storey extension in Worcester gives you two new rooms stacked on one footprint. Here's how we'd approach it, what it typically costs and the rules that apply in England.
Worcester: the key facts for this kind of project.
- Postcode districts
- WR1, WR2, WR3, WR4 and WR5
- County / area
- Worcestershire, England
- Price region
- West Midlands
- Guide price
- £72,000–£99,000 (£2,000–£2,750 per m²)
- Approval route
- It may be permitted development if it goes no more than 3 m beyond the original rear wall (counting any single-storey part) and stays 7 m from the rear boundary; otherwise it needs planning permission.
- Nearest towns
- Droitwich (6.1 miles), Great Malvern (7 miles), Stourport-on-Severn (10.7 miles)
- First visit
- Free, no obligation
About a part single, part two-storey extension
A part single, part two-storey extension is an extension where the ground floor is wider or deeper than the floor above, so only part of it rises to two storeys. It usually gives a large kitchen or living area with roof lights below and one bedroom or bathroom above. It is often a good way to add space while limiting the effect on neighbours.
We cover Worcester (WR1, WR2, WR3, WR4 and WR5) and the places around it, including Droitwich (6.1 miles), Great Malvern (7.0 miles) and Stourport-on-Severn.
What it costs in Worcester
Expect a part single, part two-storey extension in Worcester to land somewhere around £72,000–£99,000 for a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total). Our West Midlands guide rate is £2,000–£2,750 per m², including VAT. Keep a contingency of around 10% for things nobody can see until the ground is opened up.
| Spec | Per m² | A 6 m × 4 m ground floor and a first floor over half of it (36 m² in total) |
|---|---|---|
| Essential | £1,840–£2,530 per m² | £66,000–£91,000 |
| Standard | £2,000–£2,750 per m² | £72,000–£99,000 |
| Premium | £2,400–£3,300 per m² | £86,500–£119,000 |
Planning and building regulations in Worcester
In England, the extension can only be permitted development if it goes no more than 3 m beyond the original rear wall and stays at least 7 m from the rear boundary, with matching materials and roof pitch. We check the whole design against the rules, including the 50% garden coverage limit. If any part fails, or extends beyond a side wall on two floors, you need planning permission, costing £548 (or £575 for applications made from 8 December 2026).
Approval in England: Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
Building regulations: Building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end.
Design points for Worcester homes
Where to put the two-storey part
The two-storey section usually works best away from the closest neighbour, with the single-storey part on that boundary side. We test a few positions against neighbours' windows, the upstairs layout and the roof shape before choosing the one to take forward.
The roof junction
Where the single-storey roof meets the two-storey wall you need a sound weathering detail, usually a lead or similar flashing, and enough height for roof lights or a lantern. We set the roof falls and the upstairs window sill heights together so they do not clash.
How we'd run your project
Visit and first ideas
One of our team visits your house in Worcester, checks the walls, roof and drains, and sketches out options with you.
Plans, then approval
Measured survey, design, then the right approval route for your house. We explain each step before we take it.
Detail and price
Construction drawings, engineer's calculations and building control sign-off, then a written fixed price for the build.
On site
One project lead runs the job, keeps you updated and arranges inspections at each stage until completion.
Questions about part single, part two-storey extensions in Worcester
How much does a part single, part two-storey extension cost in Worcester?
Our guide for the West Midlands, which covers Worcester, is £2,000–£2,750 per m² including VAT. A typical project with a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total) comes to about £72,000–£99,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Do I need planning permission for a part single, part two-storey extension in Worcester?
Worcester is in England, so England planning rules apply. It may be permitted development if it goes no more than 3 m beyond the original rear wall (counting any single-storey part) and stays 7 m from the rear boundary; otherwise it needs planning permission. If in doubt, a lawful development certificate or a planning application gives you certainty before you build.
How long does a part single, part two-storey extension take?
Allow 4 to 8 weeks for survey and design, then the approval period (councils should decide householder applications within 8 weeks of validation), then 4 to 8 weeks of technical design, which can overlap. The build itself usually takes 14 to 20 weeks, longer for large or complex designs.
Can I add roof lights to the single-storey part?
Yes. Roof lights or a lantern over the single-storey part are one of the main reasons to choose this design, as they light the middle of a deep kitchen. In England they count towards the Part L glazing allowance, normally 25% of the new floor area plus windows removed, so we balance them with the rear doors.
Can the single-storey part be deeper than the two-storey part?
With planning permission, yes, and that is often the point of the design: the ground floor projects further into the garden while the first floor stays back from neighbours. Under permitted development, the depth limits for extensions of more than one storey can apply to the whole extension, so we confirm which route applies before drawings are finalised.
Nearby
We also cover places near Worcester, including:
Other extensions in Worcester
- Rear
- Side
- Wraparound
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Worcester · Part single, part two-storey extensions across Worcestershire
Book a free site visit in Worcester and we'll tell you what's possible, what approvals you need and what the design stage would cost.