Part single, part two-storey extensions in Sion Mills
Adding a part single, part two-storey extension in Sion Mills gives you two new rooms stacked on one footprint. Here's how we'd approach it, what it typically costs and the rules that apply in Northern Ireland.
The basics for Sion Mills at a glance.
- Postcode districts
- BT82
- County / area
- County Tyrone, Northern Ireland
- Price region
- Northern Ireland
- Guide price
- £63,500–£87,000 (£1,760–£2,420 per m²)
- Approval route
- It may be permitted development if it goes no more than 3 m beyond the original rear wall and stays 7 m from the rear boundary.
- Nearest towns
- Strabane (2.5 miles), Castlederg (7.4 miles), New Buildings (12.8 miles)
- Distance to Omagh
- about 14.7 miles
- First visit
- Free, no obligation
About a part single, part two-storey extension
A part single, part two-storey extension suits you if you want a generous ground floor but only need one extra room upstairs, or if a full two-storey design would affect a neighbour too much. You get design options that test where the two-storey part works best, the approvals your nation needs, structural design, building regulations approval and the build, carried out by vetted teams working under S&K.
Sion Mills sits about 14.7 miles from Omagh. Closer to home, Strabane is 2.5 miles away and Castlederg 7.4 miles.
What it costs in Sion Mills
Our guide for Northern Ireland is £1,760–£2,420 per m² including VAT. On a project with a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total), that puts a part single, part two-storey extension in Sion Mills at roughly £63,500–£87,000. These are guides, not quotes. Ground conditions, steelwork and access can move the figure either way.
| Spec | Per m² | A 6 m × 4 m ground floor and a first floor over half of it (36 m² in total) |
|---|---|---|
| Essential | £1,620–£2,230 per m² | £58,500–£80,000 |
| Standard | £1,760–£2,420 per m² | £63,500–£87,000 |
| Premium | £2,110–£2,900 per m² | £76,000–£104,500 |
Planning and building control in Sion Mills
In Northern Ireland, the extension can be permitted development if it goes no more than 3 m beyond the original rear wall and stays at least 7 m from the rear boundary, with height, materials and roof pitch conditions met. Specified protected areas are excluded. If the design goes further, a planning application costs £347 per dwelling, and building control approval is needed either way.
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.
Design points for Sion Mills homes
Structure at the step
The first-floor wall above often sits over the new open-plan space, so it needs a steel beam or frame to carry it. Loads come down at different points than in a full two-storey design, and the engineer sizes the foundations to suit each part.
Where to put the two-storey part
The two-storey section usually works best away from the closest neighbour, with the single-storey part on that boundary side. We test a few positions against neighbours' windows, the upstairs layout and the roof shape before choosing the one to take forward.
How we'd run your project
Free site visit
We visit your home in Sion Mills, look at the structure, access and boundaries, and talk through what you want the new rooms to do.
Plans, then approval
Measured survey, design, then the right approval route for your house. We explain each step before we take it.
Price it properly
Once the engineer's calculations are in, we fix the build price in writing, with a clear list of what's included.
Finish and certify
Second fix, plastering and making good, then building control's final inspection and the completion paperwork.
Questions about part single, part two-storey extensions in Sion Mills
Do I need planning permission for a part single, part two-storey extension in Sion Mills?
Sion Mills is in Northern Ireland. It may be permitted development if it goes no more than 3 m beyond the original rear wall and stays 7 m from the rear boundary.
How much does a part single, part two-storey extension cost in Sion Mills?
Our guide for Northern Ireland, which covers Sion Mills, is £1,760–£2,420 per m² including VAT. A typical project with a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total) comes to about £63,500–£87,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Which postcodes do you cover around Sion Mills?
We cover Sion Mills (BT82) and nearby places including Strabane, Castlederg and New Buildings, plus the rest of County Tyrone. The first site visit is free.
Can the single-storey part be deeper than the two-storey part?
With planning permission, yes, and that is often the point of the design: the ground floor projects further into the garden while the first floor stays back from neighbours. Under permitted development, the depth limits for extensions of more than one storey can apply to the whole extension, so we confirm which route applies before drawings are finalised.
Which side should the two-storey part go on?
Usually the side furthest from the nearest neighbour's windows, so the single-storey part sits nearest them and keeps their light. Other factors are where the stairs land upstairs, which room needs the extra space and where drains run. We sketch options at the design stage and explain which is most likely to be approved.
Nearby
Nearby towns we cover for part single, part two-storey extensions:
Other extensions in Sion Mills
- Rear
- Side
- Wraparound
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Sion Mills · Part single, part two-storey extensions across County Tyrone
Tell us about your house in Sion Mills and we'll call you back to arrange a free, no-obligation visit.