Orangery extensions for homes in Welwyn Garden City
Thinking about an orangery extension for your Welwyn Garden City home? Start with a free site visit: we measure up, check what the council will allow and give you honest guide figures on the day.
- Guide price in Welwyn Garden CityFrom £31,500 inc VAT
- PlanningSame limits as single-storey rear; glazing checked for building regs
- Build time10–16 weeks on site
- Postcode districtsAL6, AL7, AL8, AL10
Do I need planning permission in Welwyn Garden City?
In England a glazed or orangery-style extension follows the same size limits as any single-storey rear extension: 3 m or 4 m without an application, or up to 6 m and 8 m through prior approval. Building regulations limit glazing to about a quarter of the new floor area plus the openings it replaces, unless whole-house calculations show the design still performs.
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).
Extensions in and around Welwyn Garden City
Our survey diary covers Welwyn Garden City, including AL6, AL7, AL8, AL10. Neighbouring towns we cover include Hatfield (3 miles), Hertford (6 miles), St Albans (6 miles), Harpenden (6 miles).
Just over the Bedfordshire border, Luton is about 10 miles away. The East of England mixes market-town terraces, inter-war semis and modern estates. Clay soils are common in parts of the region, which can affect foundation design.
How much does an orangery extension cost in Welwyn Garden City?
Labour and material costs vary across the UK, so for Welwyn Garden City we use our East of England factor (×1.06). The ranges include VAT and exclude design, structural and council fees.
Typical rates in Welwyn Garden City: £2,540 to £4,770 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 3 m × 4 m 12 m² | £31,500 – £38,500 | £35,500 – £45,000 | £43,000 – £57,500 |
| 4 m × 4 m 16 m² | £40,500 – £49,500 | £47,000 – £59,500 | £57,500 – £76,500 |
| 4 m × 6 m 24 m² | £61,000 – £74,000 | £71,000 – £89,500 | £86,000 – £114,500 |
For a figure based on your own dimensions, use our guide-price tool.
When an orangery extension makes sense
- Homeowners replacing an older conservatory
- Those who want daylight without overheating
- Period and detached houses with a garden view
Our process, step by step
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
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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
The build is managed from start to finish, inspected at each stage and signed off on completion.
Orangery extension questions answered
Will my neighbours in Welwyn Garden City be involved?
If a planning application or prior approval is needed, the council notifies neighbours. If the work is on or near a shared boundary, party wall notices may also be needed.
Do I need building regulations approval in Welwyn Garden City?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
Who do I contract with for an orangery 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.
How much does an orangery cost?
Our guide range is about £2,540 to £4,770 per m² including VAT, so a 16 m² standard-spec orangery is typically £47,000 to £59,500 in Welwyn Garden City.
Does an orangery need planning permission?
It follows the same size limits as other single-storey extensions. In England many fit within permitted development or prior approval; others need an application.
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.