Utility and boot room extensions in Welwyn Garden City: design, approvals and build
Our design and build teams take on utility room extensions in Welwyn Garden City, from the first measured survey through planning and building control to the finished room.
- Guide price in Welwyn Garden CityFrom £14,500 inc VAT
- PlanningOften permitted development (3–4 m), or prior approval up to 6–8 m
- Build time6–10 weeks on site
- Postcode districtsAL6, AL7, AL8, AL10
Planning and approvals in Welwyn Garden City
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
The planning position for a specific Welwyn Garden City address depends on its history and any designations, which is why we check it at the first visit.
Building over or within 3 m of a public sewer needs the water company's consent, usually through a build-over agreement, before the foundations go in.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Utility room extension prices in Welwyn Garden City
For Welwyn Garden City we adjust our national guide rates by ×1.06, the factor we use for East of England. Figures include VAT; your written quote after the survey replaces them.
Typical rates in Welwyn Garden City: £2,010 to £3,710 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 2 m × 2.5 m 5 m² | £14,500 – £18,000 | £14,500 – £18,500 | £14,500 – £19,000 |
| 2.5 m × 3.2 m 8 m² | £16,000 – £19,500 | £19,000 – £24,000 | £23,500 – £30,000 |
| 3 m × 3.6 m 11 m² | £22,000 – £26,500 | £26,000 – £33,000 | £32,500 – £41,000 |
Try the guide-price tool to see a range for your own size and finish.
Local to Welwyn Garden City
Across AL6, AL7, AL8, AL10, we can visit, measure and advise. Nearby, we also take on projects in Hatfield (3 miles), Hertford (6 miles), St Albans (6 miles), Harpenden (6 miles).
Luton, in Bedfordshire, is roughly 10 miles from Welwyn Garden City and also on our list. Across the East of England many houses sit on generous plots, and single-storey and wraparound extensions are a natural fit.
Is a utility room extension right for your house?
- Kitchens that have run out of space for appliances
- Houses with a side passage or small rear corner
- Busy family homes
How the project works
Site visits are free and there is no obligation. Where drawings are needed, the design stage is priced in writing before it starts.
Free site visit
We visit your Welwyn Garden City home, measure up, talk through what you want and check the planning position.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Your questions about a utility room extension in Welwyn Garden City
Who do I contract with for a utility room extension in Welwyn Garden City?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Welwyn Garden City, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Do you cover all of Welwyn Garden City?
Yes. We cover Welwyn Garden City and the surrounding parts of Hertfordshire. Site visits are free and there is no obligation.
Does a utility extension need planning permission?
Often not, if it is single storey and within permitted development limits. We check this for your property.
Can a utility have a toilet?
Yes, space permitting. A WC needs drainage and extraction, which we plan into the design.
Book a free site visit in Welwyn Garden City
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.