Building regulations for two-storey extensions in County Londonderry
We handle building regulations approval for homeowners across County Londonderry, from the first visit to the final paperwork.
County Londonderry at a glance
- Nation
- Northern Ireland
- Price region
- Northern Ireland
- Postcode areas
- BT
- Towns covered
- 11 listed below, plus surrounding villages
- Site visits
- Free, no obligation
What a building regulations application involves
Building regulations approval for a two-storey extension involves preparing technical drawings and a specification that show how the extension meets the rules on structure, fire safety, insulation, ventilation, electrics and drainage, getting them approved and having the work inspected. At the end you receive a completion certificate.
The main places we list in County Londonderry are Derry (BT48), Coleraine (BT51), Limavady (BT49), Magherafelt (BT45), Portstewart (BT55) and Portrush (BT56). We cover the villages in between too.
Fees
Technical drawings and specification are a guide of £1,500–£4,000. The council's building control fee depends on the value of the work; we confirm every fee in writing before the design stage starts.
Rules in Northern Ireland
In Northern Ireland, building control approval comes from the local council under the Building Regulations (Northern Ireland), with the Technical Booklets setting out how to comply. A full plans application is usual for two-storey extensions, and the council inspects the work and issues a completion certificate.
Approval in Northern Ireland: Planning application for works to a house: £347. Councils aim to decide local applications within an average of 15 weeks; many take longer.
Building control: Building control approval from the local council under the Building Regulations (Northern Ireland), using the Technical Booklets.
There is no Party Wall Act in Northern Ireland. Shared walls and boundaries are a matter of title and common law, so we agree access and record conditions with neighbours before work starts.
Getting the design right
Full plans and inspections
Full plans approval checks the design before work starts, which we recommend for two-storey extensions. Building control then inspects key stages, such as foundations, damp-proofing, drainage and insulation, before issuing the completion certificate.
How we work in County Londonderry
Start at your house
We come to your home in County Londonderry, measure up, check the ground floor walls and roof structure, and note anything near the boundaries.
Choose the approval route
Some designs fit permitted development, most need a householder application. We decide which applies in Northern Ireland before drawing in detail.
Technical design
We prepare the building regulations drawings, structural calculations and specification so the build price can be fixed.
On site
One project lead runs the job, keeps you updated and arranges inspections at each stage until completion.
Towns we cover in County Londonderry
Building regulations for two-storey extensions in County Londonderry: questions
What is a build-over agreement?
A build-over agreement is permission from your water company to build over or near a public sewer. Many rear extensions sit near shared drains, and the water company will want access protected and the pipe checked. We check sewer records early so the agreement does not delay the start.
Do I need building regulations if I have planning permission?
Yes. Planning permission and building regulations are separate. Planning covers what the extension looks like and how it affects neighbours; building regulations cover how it is built and whether it is safe, warm and healthy. A two-storey extension needs both, unless permitted development replaces the planning part.
Neighbouring areas
- Building regulations for two-storey extensions in County Tyrone
- Building regulations for two-storey extensions in County Antrim
- Building regulations for two-storey extensions in County Armagh
- Building regulations for two-storey extensions in County Fermanagh
All extension services in County Londonderry · About building regulations for two-storey extensions
Ready to see what a second storey could do for your home?
Book a free site visit. We'll look at your house, talk through options and explain the approvals you'd need, then price the design stage in writing.