Castlereagh, County Down
Rear extension planning drawings in Castlereagh
For homes in Castlereagh, a rear extension is often the simplest way to gain space without moving. Measured survey, design options, planning drawings and the application, handled for you. We take it from survey to completion certificate.
We cover Castlereagh (BT8) as part of our County Down work. For Castlereagh homes we start with a measured survey, then draw options before anything is submitted.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
What do rear extension planning drawings cost in Castlereagh?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension, or £2,000–£3,500 for a two-storey scheme. Planning fees in Northern Ireland are set by the Department for Infrastructure; we confirm the current householder fee when we submit. Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a rear extension in Castlereagh?
Here is how the rules in Northern Ireland apply to a rear extension in Castlereagh.
In Northern Ireland a rear extension of more than one storey can be permitted development if it projects no more than 3 metres and stays at least 7 metres from the rear boundary. Two-storey extensions in conservation areas, and most larger schemes, need planning permission from the council.
Northern Ireland councils work to a 15-week target for local applications, which include householder extensions; many householder decisions come sooner.
Conservation areas, Areas of Outstanding Natural Beauty and listed buildings restrict permitted development in Northern Ireland. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Castlereagh like to extend?
Semis and detached houses are typical of Castlereagh, and many have room for a rear extension within Northern Ireland's permitted development limits. Planning applications in Castlereagh go to the local planning authority covering Castlereagh, and we check its local design guidance for rear extensions before drawing.
How a rear extension in Castlereagh comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check or planning application, then building control drawings to the Northern Ireland Technical Booklets and structural calculations, plus a written agreement with neighbours for any shared-wall work.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Rear extension planning drawings near Castlereagh
Close by, we work in Belfast, about 2.3 miles away, and Dundonald, about 3.7 miles away.
- Rear extension planning drawings in Belfast
- Rear extension planning drawings in Dundonald
- Rear extension planning drawings in Holywood
- Rear extension planning drawings in Newtownabbey
- Rear extension planning drawings in Lisburn
Other work in Castlereagh:
FAQ
Rear extension planning drawings questions in Castlereagh
Do you handle building control in Castlereagh?
Yes. We apply to the council's building control team and hand over the completion certificate.
Can you match the brick or stone on my Castlereagh house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Are the drawings mine?
You can use them to get other quotes, subject to the terms.
What postcode areas do you cover around Castlereagh?
Including BT8, and the surrounding County Down area.
Do I need a party wall agreement?
Northern Ireland has no Party Wall Act; we agree any shared-wall work with your neighbour in writing.
Do I need planning permission for a rear extension in Castlereagh?
Often not for a single-storey rear extension of up to 3 metres (4 metres detached) under Northern Ireland's permitted development rules, outside conservation areas.