Bifold doors are glazed panels that fold and stack to one side to open up a wide gap, while sliding doors glide past each other on tracks; both connect a living space to the garden and bring in more daylight.
From Derry/Londonderry, Coleraine, Limavady and Magherafelt to the quieter corners of County Londonderry, homeowners can book a free survey for bifold or sliding doors. We look at the building, agree the scope, then send a quote in writing that fixes the cost of that scope. Work follows the rules for Northern Ireland, and our published range for Northern Ireland, £2,600–£6,900 with VAT, gives you a sense of budget before we visit.
- Guide price
- £2,600–£6,900 inc VAT
- Time on site
- 1–2 days to fit into a ready opening
- Planning rules
- Northern Ireland
- Price level
- About 14% below the national guide
- Towns listed
- 4
- Survey
- Free, with a written quote
How much do bifold or sliding doors cost in County Londonderry?
What will bifold or sliding doors cost in County Londonderry? Our guide range is £2,600–£6,900 including VAT. That figure is adjusted for Northern Ireland, about 14% below the national guide, and is intended for planning a budget. A firm written price for your chosen specification follows a free survey at your home.
| Type of job | What it usually involves | Guide in County Londonderry |
|---|---|---|
| uPVC sliding or French doors | Standard uPVC doors fitted into an existing opening of up to about 2m. | £1,300–£2,600 |
| 3m aluminium bifold | A three-panel aluminium bifold in a standard colour, fitted into a ready opening. | £3,000–£6,000 |
| Wide bifold or slimline slider | Openings of 4m or more and slim-frame doors, often with a new steel above. | £6,000–£12,000 |
The main things that change the figure:
- Width and height of the opening and number of panels
- Frame material: uPVC, standard aluminium or slimline aluminium
- Glazing upgrades such as solar control or triple glazing
- Widening the opening with a new steel beam
What do you get?
- Measured survey of the opening, lintel and floor levels
- Toughened double glazing as standard, with solar control options
- Level or low threshold options to suit your patio
- Opening widened with a new lintel or steel where agreed
- Weather seals, cills and internal trims finished neatly
- Building regulations sign-off arranged for the new doors
Homes in County Londonderry
Derry has Georgian and Victorian terraces around its walled city, alongside large post-war estates and newer developments. Coleraine, Limavady and Magherafelt mix older town centres with semis and estates, Portstewart has seaside villas, and rural areas have many detached homes and bungalows, often roughcast.
Terraces suit loft conversions and rear extensions, while rural bungalows commonly take extensions, loft rooms and driveways. Roughcast homes often need re-rendering, and coastal houses need roofline and window renewal.
The north coast faces Atlantic wind, rain and salt, and the Sperrins inland are colder and wetter.
Do you need permission in County Londonderry?
Homes in County Londonderry come under the regulations for Northern Ireland, summarised below. We don't rely on general rules alone: we confirm the position for your address with the council before a quote goes out.
In Northern Ireland, like-for-like replacement windows and doors on a house rarely need planning permission. Listed buildings and conservation areas are the main exceptions, so check with the council before changing style or material.
The Building Regulations (Northern Ireland) apply to replacement windows, so the work needs building control approval or sign-off through an approved competent person route.
Rules change and every property is different, so we check the planning history and constraints for your address before we quote.
How does the job run?
Survey and measure
We arrange a free site survey on a date convenient to you. We measure up, look at the existing structure and access, and discuss your plans for bifold or sliding doors so the price reflects your home.
Your fixed price
You get the price in writing, itemised so you can see where the money goes. As long as the specification stays the same, that is the price you pay for bifold or sliding doors.
Plan and prepare
Once you accept, we agree start dates, order materials and deal with any planning, building control or neighbour notices the job needs. You'll know who is coming and when before work begins.
Finish and handover
Work goes ahead as scheduled and you deal with one contact throughout. When the last trade leaves, we clear and clean the site, talk you through what has been done and pass on any certificates and care instructions.
What you can expect from us
Frequently asked questions
Can I have a level threshold?
A level threshold means the door track sits flush with the floor, so there is no step between inside and out. Most aluminium bifolds and sliders can be fitted this way, but the outside paving must sit just below the track with a drainage channel to keep rain out. Rebated thresholds give stronger weather protection with only a small step. We check floor and patio levels before recommending either.
How much do bifold doors cost?
Bifold doors cost £2,600–£6,900 for a typical 3m opening, supplied and fitted. As a rough guide, allow around £900–£2,000 per metre of width plus the fixed costs of fitting, depending on frame material and glass. uPVC sits at the lower end and slimline aluminium at the top. Widening the opening with a new steel adds to the price. We confirm a fixed figure after measuring.
Will large glass doors make my room cold?
Large glass doors lose more heat than an insulated wall, but modern double glazing with thermally broken frames performs far better than older patio doors. Solar control glass helps stop south-facing rooms overheating in summer. In extensions, building control looks at the total glazed area, so heat-loss calculations may be needed. We can suggest glass specifications that balance light, warmth and cost.
Which postcodes in County Londonderry do you cover?
We cover BT48, BT52, BT49 and BT45, along with the rest of County Londonderry. If your postcode is not listed, get in touch anyway: our coverage is UK-wide, and we can usually arrange a survey wherever you live. Enter your postcode in the guide-price tool or contact form and we will confirm.
What happens at the survey?
We visit your home at a time that suits you, look at the area involved, take measurements and check access, condition and any services that might be affected. We talk through what you want from bifold or sliding doors, explain the options and answer questions. There is no charge and no obligation; afterwards we send a written quote.
Towns in County Londonderry
Find your town below. Every place listed in County Londonderry is covered for bifold or sliding doors, with the same survey, written quote and fixed-price process.