New and widened openings for sliding doors across County Down
The right door depends on the opening, the room and the way you use the garden. Here is how sliding doors for new openings tend to work out in practice:
Turning a County Down kitchen window into a door to the garden? Check where drains, gullies and air bricks sit outside, because they can affect the new threshold.
Thinking about a wider opening in County Down but unsure of the size? Mark it out on the wall inside and out with tape, then picture the furniture and the view before you decide.
- Structural calculations are included in the guide price, and the Building Regulations application is handled as part of the project, so you are not left coordinating engineers and inspectors.
- The door is measured from the finished opening rather than from drawings, so it fits the opening as built, not as it was intended to be built.
- Widening a standard patio opening to a larger span can transform how a room connects to the garden, giving a wall of glass rather than a doorway.
Guide prices for sliding doors for new openings in County Down
Use these guide prices to budget for the whole job in County Down: the door, the steelwork, making good and the engineer's calculations, including VAT. Building Control or warrant fees are charged by the council on top.
| Overall width | Typical panels | Guide price (fitted, inc VAT) |
|---|---|---|
| 1.8 m | 2 panels | £6,995–£7,795 |
| 2.4 m | 2 panels | £7,895–£8,895 |
| 3.6 m | 3 panels | £9,695–£10,895 |
| 4.8 m | 4 panels | £11,495–£12,995 |
Every size is on the sliding doors for new openings page.
Daylight and glass in County Down
The midday sun over County Down ranges from about 12° at the winter solstice to about 59° at midsummer. Low-angle winter light reaches further into a room through a tall door, which is one reason taller panels are worth considering; on south or west walls, pair them with solar-control glass.
Towns we cover in County Down
We survey and fit sliding doors for new openings in 13 towns across County Down, including the BT18, BT20, BT21, BT23, BT24, BT25 postcode districts.
Approvals in Northern Ireland
Opening up a wall in Northern Ireland needs district council building control approval and structural calculations. We take on this work in Northern Ireland by arrangement.
Questions about sliding doors for new openings in County Down
Do you fit sliding doors for new openings in County Down?
Yes, by arrangement. County Down is in an area we cover by arrangement: the survey is still free, and survey dates, delivery and any travel cost for delivery and fitting are confirmed in your quote before you order.
Do I need building regulations to widen a door opening?
Yes, forming or widening an opening is structural work and needs a Building Regulations application in England, supported by structural calculations. Building Control inspects the work, typically including the steel and its bearings. In Scotland a building warrant is needed. Wales and Northern Ireland follow their own building regulations through local authority or district council building control.
Do I need a steel beam for sliding doors?
A widened or new opening usually needs a steel beam or a suitable lintel to carry the wall and anything above it, and for wider openings a steel beam is the usual answer. A structural engineer chooses the size and bearing details based on the loads. The beam is placed on padstones at each end to spread its load into the masonry.
Can you turn a window into a sliding door?
Yes, a window opening can usually be extended down to the floor and often widened to take a sliding door. The work involves removing the masonry below the window, forming a new threshold, and fitting a steel beam or lintel if the opening is widened. Drains, air bricks and floor levels outside need checking, and the work needs a Building Regulations application.