Bifold Door Cost Calculator
Estimated Total Cost: £0
Cost Breakdown
What’s Included in Your Quote?
How to Use This Calculator
Getting an accurate estimate for your bifold doors is straightforward. Start by selecting your preferred material – aluminium offers the best balance of durability and aesthetics, uPVC provides excellent value, whilst timber delivers that classic, warm appearance.
Next, specify the number of panels you need. This typically depends on your opening width: 2-3 panels work well for smaller spaces (2-3 metres), whilst 4-6 panels suit larger openings (4-6 metres). Each panel generally measures 600-900mm wide when closed.
Enter your exact opening dimensions. The width is crucial as it determines how many panels will fit comfortably. Standard heights range from 2.1 to 2.4 metres, though bespoke sizes are available.
Choose your glazing carefully. Double glazing is standard and performs well in most UK homes, achieving U-values of 1.2-1.6 W/m²K. Triple glazing costs more but delivers superior insulation (0.7-1.0 W/m²K), which can significantly reduce heating bills in colder regions.
The installation complexity affects both time and cost. A simple installation uses an existing opening with minimal work (1-2 days). Moderate complexity involves some structural adjustments, perhaps removing a window or small wall section (2-3 days). Complex installations require creating new openings, installing support beams, or significant structural work (3-5 days).
Material Comparison
| Material | Price Range | Lifespan | Maintenance | Best For |
|---|---|---|---|---|
| uPVC | £1,500 – £4,500 | 10-20 years | Very Low | Budget-conscious, internal use |
| Aluminium | £2,500 – £7,100 | 20-40 years | Low | Modern aesthetics, durability |
| Timber | £3,000 – £6,200 | 15-30 years | Moderate-High | Traditional homes, natural look |
Aluminium remains the most popular choice for UK homeowners, representing over 60% of bifold door installations. Its slim sightlines allow maximum glass area and natural light, whilst the material’s strength permits larger panels without compromising security. Powder-coated finishes resist fading and corrosion, even in coastal areas.
uPVC bifolds have improved significantly in recent years. Modern designs feature reinforced frames and can achieve impressive thermal performance. They’re ideal for those wanting bifold functionality without the premium price tag, particularly for internal room dividers or conservatory openings.
Timber bifolds bring warmth and character. Oak, meranti, and idigbo are common choices. They require regular treatment (every 2-3 years for external surfaces) but can be sanded and refinished, potentially lasting longer than other materials with proper care.
Factors Affecting Your Final Price
Size and Configuration
The opening width directly impacts cost. Each additional panel adds £500-£1,000 to the total. Larger glass panes cost more to manufacture and require toughened safety glass. Openings wider than 4 metres may need structural support like steel beams, adding £800-£2,000 to your project.
Glazing Specifications
Standard double glazing uses two 4mm glass panes with a 16-20mm cavity filled with argon gas. Triple glazing adds a third pane, improving thermal performance but increasing weight and cost by 30-40%. Tinted glass reduces glare and solar gain (adds £300-£600), whilst self-cleaning glass uses a photocatalytic coating (adds £400-£800).
Hardware and Security
Standard bifolds include multi-point locking on the master door. Enhanced security packages feature locking on every panel, anti-lift blocks, and reinforced hinges (£250-£500 extra). All bifolds should meet PAS 24 security standards and achieve Secured by Design accreditation.
Thresholds and Accessibility
Standard thresholds sit 15-25mm above floor level to manage water ingress. Low-profile thresholds (under 15mm) improve accessibility for wheelchairs and pushchairs but require careful installation and drainage planning. Some designs achieve completely flush thresholds using concealed drainage channels (adds £400-£800).
Installation Considerations
Proper installation is crucial for performance and longevity. Poor installation causes draughts, water penetration, and premature failure. Professional installers should check structural support, ensure square and level openings, install damp-proof courses, and seal properly.
Building regulations apply to most bifold installations. You’ll need compliance for structural work (removing walls), thermal performance (meeting U-value requirements), and sometimes planning permission for listed buildings or conservation areas. Your installer should handle building control notifications.
Typical installation takes 1-3 days depending on complexity. Day one involves removing old doors/windows and preparing the opening. Day two sees the bifold frame installed, packed, and sealed. Day three (if needed) covers finishing, decorating, and snagging. Allow extra time for brickwork, plastering, or flooring adjustments.
Frequently Asked Questions
Common Misconceptions
“Bifolds are draughty and let in cold air”
This was true of early designs, but modern bifolds with proper seals and thermal breaks perform as well as any door. Quality systems use multiple weather seals, low-E glass coatings, and thermally broken frames. When properly installed, they’re no colder than windows of equivalent size.
“The mechanisms are unreliable and break easily”
Early bifolds did suffer reliability issues, but contemporary hardware is robust. Quality brands use stainless steel components, heavy-duty hinges, and smooth roller systems. Problems usually stem from poor installation (misalignment) or inadequate maintenance (cleaning tracks). Well-installed bifolds operate smoothly for decades.
“You can’t have bifolds in exposed or windy locations”
Properly specified bifolds handle coastal and exposed conditions well. Use marine-grade aluminium or timber with protective coatings. Ensure adequate structural support and specify higher wind-loading ratings. Many coastal properties successfully use bifolds – it’s about appropriate specification rather than avoiding them entirely.
“Larger configurations are always better”
More panels create wider openings but also mean more stacking space when open. Six panels stacking to one side occupy significant wall space. Consider whether 4-5 panels provide sufficient opening whilst leaving useful wall space for furniture. Bigger isn’t always better – it’s about matching configuration to your space.
Maximising Your Investment
Choose quality over price. Cheap bifolds suffer operational problems and rarely last their expected lifespan. Mid-range systems from reputable manufacturers offer excellent value, balancing performance and cost. Premium brands justify higher prices through superior materials, innovative hardware, and comprehensive warranties.
Consider whole-life costs rather than just purchase price. Aluminium costs more initially but requires minimal maintenance over 25+ years. Timber needs regular treatment (£200-£400 every 2-3 years), whilst uPVC may need replacement sooner. Factor in energy savings too – efficient glazing reduces heating bills by £150-£300 annually.
Don’t skimp on installation. The best doors perform poorly if badly fitted. Professional installation ensures proper alignment, weatherproofing, and operation. It includes building regulation compliance, appropriate guarantees, and rectification if problems arise. Budget £600-£1,500 for professional fitting – it’s money well spent.
Plan for the future. Specify handles and hardware positions considering accessibility needs. Low thresholds aid mobility as you age. Ensure adequate structural support for current doors and any future upgrades. Quality installations last decades, so think long-term rather than immediate needs.