Extension plans and drawings across Derry/Londonderry
Need extension plans and drawings in Derry/Londonderry? We survey the house, prepare what the council needs and deal with the officers until a decision is made.
- Guide price in Derry/LondonderryFrom £1,000 inc VAT
- PlanningWe find the right route for you
- Timescale2–6 weeks for drawings
- Postcode districtsBT48
Who this service is for
- Projects that need a planning application or other approval
- Homeowners at the very start of a project
- Anyone who wants fixed designs before getting build prices
The most expensive changes are the ones made after the steel is ordered. A good design stage settles layout, heights, glazing and services on paper, so the build price is firm.
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 | Measured survey and planning drawings | £1,000 – £1,900 |
| Standard | Planning drawings plus building regulations drawings | £1,850 – £3,300 |
| Premium | Full pack with structural calculations and 3D visuals | £2,900 – £4,750 |
For a figure based on your own dimensions, use our guide-price tool.
Planning rules that apply in Derry/Londonderry
In Northern Ireland we check the permitted development limits for your house type and, where needed, apply to your council for planning permission, then submit full plans or a building notice to council building control.
The planning position for a specific Derry/Londonderry address depends on its history and any designations, which is why we check it at the first visit.
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.
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.
Applications are decided by your council, which handles local planning in Northern Ireland.
Extensions in and around Derry/Londonderry
We cover Derry/Londonderry and the postcode districts BT48. We also work in nearby Limavady (15 miles), Coleraine (27 miles), Magherafelt (31 miles).
For homes towards County Tyrone, Strabane is around 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.
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
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Common questions in Derry/Londonderry
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.
Do you cover all of Derry/Londonderry?
Yes. We cover Derry/Londonderry and the surrounding parts of County Londonderry. Site visits are free and there is no obligation.
How long does this take for a Derry/Londonderry home?
2–6 weeks for drawings, depending on the council and the complexity of the project.
Do I need an architect?
Not necessarily. For most extensions an experienced designer or architectural technologist is enough. For listed buildings or complex sites an architect’s input can help.
How much do extension plans cost?
Our design packs range from about £1,000 to £4,750 including VAT, from planning drawings only to a full pack with building regulations drawings, structural calculations and 3D views. Council fees are separate.
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.