Building regulations for extensions across Derry/Londonderry
For Derry/Londonderry homeowners we handle building regulations for extensions, with fees agreed in writing before any work starts.
- Guide price in Derry/LondonderryFrom £750 inc VAT
- Approval routeFull plans or building notice to council
- Timescale2–5 weeks for drawings
- Postcode districtsBT48
What is included
- Inspection bookings throughout the build
- Structural calculations for beams, lintels and foundations
- Building regulations drawings and written specification
- Completion certificate on sign-off
Design and approval fees for Derry/Londonderry
These are guide fees for Derry/Londonderry, adjusted for Northern Ireland (×0.86) and including VAT. Council application and inspection fees are paid separately.
| Option | What it covers | Guide price |
|---|---|---|
| Essential | Building regulations drawings for a simple single-storey extension | £750 – £1,550 |
| Standard | Drawings plus structural calculations | £1,100 – £2,250 |
| Premium | Complex or two-storey pack with energy calculations | £1,850 – £3,300 |
Our design fee only. Building control charges are set by your council (or, in England and Wales, a registered building control approver) and quoted separately.Council fees are extra and are set by the Northern Ireland Executive.
Try the guide-price tool to see a range for your own size and finish.
Extensions in and around Derry/Londonderry
Site visits are available across Derry/Londonderry (BT48). Neighbouring towns we cover include Limavady (15 miles), Coleraine (27 miles), Magherafelt (31 miles).
Just over the County Tyrone border, Strabane is about 13 miles away. Northern Ireland's housing ranges from city terraces to large numbers of detached houses and bungalows on rural plots, many in render, where single-storey extensions fit easily.
Planning rules that apply in Derry/Londonderry
In Northern Ireland building control is run by the councils under the Building Regulations (Northern Ireland). We submit full plans or a building notice and book the inspections through to completion.
Before any drawing is finalised we check whether the house is listed, in a conservation area or subject to an Article 4 direction.
Building close to a public sewer needs the agreement of NI Water, which we check during design.
Northern Ireland has no Party Wall Act. Where work is on or close to a shared boundary, we agree access and protection with your neighbour in writing before work starts.
Applications are decided by your council, which handles local planning in Northern Ireland.
What happens next
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
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
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
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions answered
Do I need building regulations approval in Derry/Londonderry?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
Will my neighbours in Derry/Londonderry be involved?
If a planning application is needed, the council notifies neighbours. Where work is close to a shared boundary, we agree access and protection with them in writing.
Who do I contract with in Derry/Londonderry?
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.
Full plans or building notice?
A full plans application gets the drawings checked before work starts, which we usually recommend for extensions. A building notice is quicker to submit but carries more risk if something needs changing on site.
Book a free site visit in Derry/Londonderry
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.