Part single, part two-storey extensions in Oakwood (Derbyshire)
Adding a part single, part two-storey extension in Oakwood (Derbyshire) 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.
The basics for Oakwood (Derbyshire) at a glance.
- Postcode districts
- DE21
- County / area
- Derbyshire, England
- Price region
- East Midlands
- Guide price
- £70,500–£97,000 (£1,960–£2,700 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
- Chaddesden (1 mile), Derby (2.4 miles), Sinfin (4.9 miles)
- Distance to Derby
- about 2.4 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 Oakwood (Derbyshire) (DE21) and the places around it, including Chaddesden (1.0 miles), Derby (2.4 miles) and Sinfin.
What it costs in Oakwood (Derbyshire)
Most of the cost of a part single, part two-storey extension is set by its size and specification. For Oakwood (Derbyshire) and the rest of the East Midlands, our guide is £1,960–£2,700 per m² including VAT, so about £70,500–£97,000 for a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total). Kitchens, bathroom fittings and flooring are priced separately so you can compare like with like.
| Spec | Per m² | A 6 m × 4 m ground floor and a first floor over half of it (36 m² in total) |
|---|---|---|
| Essential | £1,800–£2,480 per m² | £65,000–£89,500 |
| Standard | £1,960–£2,700 per m² | £70,500–£97,000 |
| Premium | £2,350–£3,230 per m² | £84,500–£116,500 |
Planning and building regulations in Oakwood (Derbyshire)
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 Oakwood (Derbyshire) homes
Light into the kitchen
The single-storey part is the place for roof lights or a lantern, which bring daylight deep into the plan. In England, glazing is normally limited to 25% of the new floor area plus any windows removed, unless calculations show the house still performs, so we plan the balance early.
Structure at the step
The first-floor wall above often sits over the new open-plan space, so it needs a steel beam or frame to carry it. Loads come down at different points than in a full two-storey design, and the engineer sizes the foundations to suit each part.
How we'd run your project
Start at your house
We come to your home in Oakwood (Derbyshire), measure up, check the ground floor walls and roof structure, and note anything near the boundaries.
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 Oakwood (Derbyshire)
Do I need planning permission for a part single, part two-storey extension in Oakwood (Derbyshire)?
Oakwood (Derbyshire) 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.
Which postcodes do you cover around Oakwood (Derbyshire)?
We cover Oakwood (Derbyshire) (DE21) and nearby places including Chaddesden, Derby and Sinfin, plus the rest of Derbyshire. The first site visit is free.
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.
Which side should the two-storey part go on?
Usually the side furthest from the nearest neighbour's windows, so the single-storey part sits nearest them and keeps their light. Other factors are where the stairs land upstairs, which room needs the extra space and where drains run. We sketch options at the design stage and explain which is most likely to be approved.
Nearby
We also cover places near Oakwood (Derbyshire), including:
Other extensions in Oakwood (Derbyshire)
- Rear
- Side
- Wraparound
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Oakwood (Derbyshire) · Part single, part two-storey extensions across Derbyshire
Send us your postcode and a few details. We'll get back to you to arrange a visit and talk through your options.