Sliding doors for extensions and garden rooms across County Antrim
Before you settle on a door type, it helps to know what sliding doors for extensions do well and what to check before you order.
Planning an extension in County Antrim? Send us the drawings before the steel is ordered, so the beam above the doors can be designed with the door in mind.
For a garden room at the bottom of a County Antrim garden, think about access: large glass panels need a clear route from the road to the site.
- Agreeing a fitting date with your builder lets the extension be made weathertight on programme, so plastering and flooring can follow without waiting on the doors.
- Garden rooms benefit from the same approach, with a door sized to the frame and a header designed to carry the roof without pressing down on the door.
- Telling the engineer the door type and span early lets them design the beam above it to limit deflection, protecting the smooth running of large sliding panels.
Guide prices for sliding doors for extensions in County Antrim
These are guide prices for fitted doors, including VAT. They run from an entry-level system to a premium one at the same size; the survey confirms which suits your opening.
| Overall width | Typical panels | Guide price (fitted, inc VAT) |
|---|---|---|
| 1.8 m | 2 panels | £5,095–£6,195 |
| 3.0 m | 2 panels | £6,895–£8,395 |
| 4.0 m | 3 panels | £8,395–£10,195 |
| 6.0 m | 4 panels | £11,395–£13,895 |
Every size is on the sliding doors for extensions page.
Daylight and glass in County Antrim
Because County Antrim sees long summer days (about 17 h 20 min) and short winter ones (about 7 h 12 min), the elevation your door faces makes a real difference. With the midday sun at about 12° in winter, a south-facing door brings light well into the room; a west-facing door catches hot late-afternoon sun in summer.
Towns we cover in County Antrim
We survey and fit sliding doors for extensions in 11 towns across County Antrim, including the BT1, BT27, BT37, BT38, BT39, BT40 postcode districts.
Approvals in Northern Ireland
Extensions in Northern Ireland are approved by district council building control under the Building Regulations (Northern Ireland), including their doors. We take on work in Northern Ireland by arrangement.
Questions about sliding doors for extensions in County Antrim
Do I need building approval for sliding doors for extensions in County Antrim?
In Northern Ireland the Building Regulations (Northern Ireland) apply through district council building control; work there is by arrangement. We confirm the right route for your property at survey, so the paperwork is in place before fitting.
Can you work with my builder and architect?
Yes, working with your builder, architect and structural engineer is the normal way we approach extension doors. We can provide technical details, opening sizes, threshold requirements and fixing information, and attend site for the check survey. Your builder forms the opening and prepares the floor, and our installers fit the doors to the agreed programme.
Why does the steel beam matter for sliding doors?
The steel beam above an extension's sliding door matters because every beam bends a little under load, and a large sliding door needs a straight, level head to run freely. If the engineer knows a wide slider will sit under the beam, they can design for low deflection. Too much movement can make panels stiff or bind.
When should I order sliding doors for an extension?
Order sliding doors for an extension as soon as the opening is built and a check survey can be done, and agree the target fitting date with your builder in advance. Slimline doors typically take 6–8 weeks to make after sign-off. Getting a quote from drawings early means the specification is settled and only the final measurements are needed.