Cardiff, Cardiff and the Vale
Rear extension planning drawings in Cardiff
Thinking about a rear extension in Cardiff? Measured survey, design options, planning drawings and the application, handled for you. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
Cardiff sits in Cardiff and the Vale, with postcode districts including CF3, CF5, CF11 and CF14. Planning applications in Cardiff go to the local planning authority covering Cardiff, and we check its local design guidance for rear extensions before drawing.
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 Cardiff?
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 Wales are set by the Welsh Government; we confirm the current householder fee when we prepare the application. 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 Cardiff?
Planning for a rear extension in Cardiff follows the Welsh householder rules.
In Wales a rear extension of more than one storey can be permitted development if the ground floor projects no more than 4 metres and the upper floor no more than 3 metres, with at least 10.5 metres to the rear boundary. It is not permitted development in conservation areas, National Parks or National Landscapes, so many double-storey schemes need a householder application.
Welsh councils aim to decide householder applications within 8 weeks.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent. 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 Cardiff like to extend?
Older terraces near the centre and post-war semis further out are typical of Cardiff. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a rear extension in Cardiff comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Rear extension planning drawings near Cardiff
Neighbouring places we cover include Whitchurch (2.8 miles) and Penarth (2.9 miles).
- Rear extension planning drawings in Whitchurch
- Rear extension planning drawings in Penarth
- Rear extension planning drawings in Rhiwbina
- Rear extension planning drawings in Caerphilly
- Rear extension planning drawings in Barry
Other work in Cardiff:
FAQ
Rear extension planning drawings questions in Cardiff
Do you handle building control in Cardiff?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Can I see the design in 3D?
Yes; we produce simple 3D views so you can judge the size and light.
Is the site visit in Cardiff free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
What do rear extension planning drawings cost in Cardiff?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension and £2,000–£3,500 for a two-storey scheme, covering the measured survey, design options and the application. The council fee is extra.