Patio Door Cost Calculator UK 2025
Get an instant estimate for your patio door project including materials and installation
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How to Use This Calculator
Getting an accurate quote for your patio door project starts with the right measurements and choices. Here’s how to make the most of this calculator:
Step 1: Choose Your Door Type
Think about how you want your door to operate. Sliding doors are perfect for smaller spaces since they don’t need swing clearance. French doors give you that classic look with doors that open outwards. Bi-fold doors are brilliant if you want to open up an entire wall to your garden.
Step 2: Select Your Material
uPVC offers fantastic value and low maintenance, making it the most popular choice. Aluminium gives you slim frames and a modern aesthetic, plus it lasts longer. Timber provides that timeless charm and natural insulation, though it needs regular maintenance to keep it looking its best.
Step 3: Get Your Measurements Right
Measure the width and height of your opening in millimetres. If you’re replacing an existing door, measure from the outside of the frame. For a new installation, measure the rough opening. Standard heights are typically 2100mm, whilst widths vary greatly depending on your space.
Step 4: Select Additional Options
Consider what matters most to you. Triple glazing costs more upfront but saves money on heating bills over time. Toughened glass is worth it for safety, especially with children around. Integrated blinds eliminate the hassle of fitting separate window coverings.
Material Comparison: Which is Right for You?
| Feature | uPVC | Aluminium | Timber |
|---|---|---|---|
| Price Range (Supply Only) [web:2][web:5] | £500 – £2,600 | £1,165 – £4,500 | £1,345 – £6,500 |
| Lifespan [page:2] | 15-20 years | 25-30+ years | 20-25 years |
| Maintenance | Very low – occasional clean | Very low – wipe down | High – regular treatment |
| Insulation | Excellent | Good (with thermal breaks) | Excellent (natural) |
| Strength | Good | Excellent – strongest | Good |
| Frame Width | Thicker profiles | Slimmest – more glass | Medium |
| Eco-Friendliness | Recyclable | 100% recyclable | Renewable (if sustainably sourced) |
| Colour Options | Limited, can look plasticky [web:6] | Extensive – any RAL colour | Natural wood – can be painted |
What Affects Your Patio Door Cost?
Size Matters
Larger doors mean more materials and more labour. A standard 2400mm x 2100mm sliding door costs considerably less than a 6000mm bi-fold installation. Every extra panel adds to both material and installation time [page:1][page:2].
Glazing Performance
Double glazing is standard and provides excellent thermal performance. Triple glazing adds around £300-£600 to your costs but can save you up to £250 annually on energy bills according to industry estimates [page:1]. It’s particularly worthwhile in colder regions or north-facing installations.
Installation Complexity
A straightforward like-for-like replacement might cost £400-£600 for labour. But if you’re creating a new opening, removing load-bearing walls, or installing lintels, expect installation costs to reach £800-£1,500 or more. You might need a structural engineer (around £100-£150 for calculations) and building regulations approval [page:2].
Location and Access
Installers in London and the South East typically charge 10-20% more than those in the North or Scotland. Difficult access – like upper floors or narrow passages – can also increase labour costs by £100-£300.
Money-Saving Tips
- Get quotes from at least three installers to compare prices
- Consider off-season installation (autumn/winter) when demand is lower
- Look for manufacturers offering direct-to-consumer sales
- Bundle your patio door installation with other home improvements
- Choose standard sizes rather than custom dimensions
- White uPVC is always cheaper than coloured finishes
Door Type Deep Dive
Sliding Patio Doors: The Space Saver
Cost Range: £800-£4,500 depending on material and size [web:2][web:5]
Sliding doors glide along tracks, making them perfect when you’re short on space. You don’t need any clearance for door swing, so furniture can sit right up against them. Modern rollers make operation smooth and effortless, even with large glass panels.
Best for: Small patios, balconies, or rooms where space is tight. They’re also ideal for wheelchair accessibility [page:2].
Watch out for: Track maintenance is essential – debris buildup can cause operational issues. One panel is always fixed, so your maximum opening is 50% of the total width.
French Patio Doors: Classic Elegance
Cost Range: £500-£3,000 depending on material [web:2][web:5]
French doors open outwards on hinges, giving you that traditional, elegant appearance. When both doors are open, you get a complete clear opening that physically connects your indoor and outdoor spaces.
Best for: Period properties, those wanting a traditional aesthetic, or when you need full-width access.
Watch out for: You need clearance space outside for the doors to swing. Strong winds can catch open doors. Hinges may require adjustment over time [page:2].
Bi-fold Patio Doors: Maximum Opening
Cost Range: £1,500-£6,200 for aluminium [web:2][web:5]
Bi-folds fold back concertina-style, allowing you to open up an entire wall. They create a seamless indoor-outdoor living space that’s perfect for entertaining. With panels that can fold to either side, you’ve got flexibility in how you open them.
Best for: Modern homes, large openings (over 3 metres), creating that ‘wow factor’.
Watch out for: They’re the most expensive option. Track maintenance is crucial. When fully open, the stacked panels take up space to one side [page:2].
Frequently Asked Questions
How long does patio door installation take?
A straightforward replacement takes 4-6 hours for sliding or French doors. Bi-fold installations might take a full day. If structural work is needed – like creating a new opening or installing lintels – expect 2-3 days minimum [page:2].
Do I need planning permission?
Usually not for like-for-like replacements. However, if you’re enlarging an opening, you might need approval. Listed buildings and properties in conservation areas have stricter requirements – always check with your local council first [page:2].
What about building regulations?
Yes, all patio door installations must meet UK Building Regulations for thermal efficiency, safety glass requirements, and ventilation. Using a FENSA or CERTASS registered installer means they handle the certification without council involvement [page:2].
Can I install patio doors myself?
Whilst possible, it’s not recommended. Improper installation can lead to draughts, water ingress, security vulnerabilities, and structural issues. Professional installation ensures proper load-bearing support and building regulation compliance. The £400-£700 installation cost is worthwhile for peace of mind [page:1][page:2].
Which is more secure – sliding or French doors?
Modern sliding and French doors both offer excellent security with multi-point locking systems. Aluminium frames generally provide better security than uPVC due to their inherent strength [web:6]. Look for Secured by Design certification regardless of door type.
Will patio doors increase my property value?
Absolutely. Quality patio doors can add 5-10% to your property’s market value, particularly when they create good indoor-outdoor flow and maximise natural light. They’re a desirable feature for prospective buyers [page:1].
What’s the best material for coastal areas?
Aluminium is your best choice for coastal locations. Unlike uPVC or timber, it doesn’t corrode in salty air and maintains its appearance with minimal maintenance. Look for marine-grade powder coating for extra protection.
How much does it cost to make the opening larger?
Creating a larger opening adds significant costs. Expect £800-£1,500 for structural work including lintel installation, plus around £100-£150 for structural engineer calculations. You’ll also need to budget for making good the walls (plastering) and flooring [page:2].
Making Your Decision: What to Consider
Think Long-Term
Don’t just look at upfront costs. Aluminium doors cost more initially but last 30+ years with virtually no maintenance. uPVC needs replacing after 15-20 years. Timber requires regular treatment. Calculate lifetime costs, not just purchase price.
Energy Efficiency Pays
A-rated patio doors with double glazing typically cost £200-£400 more than C-rated alternatives. But with potential annual savings of £150-£250 on heating bills, they pay for themselves within 2-3 years. Triple glazing takes longer to recoup but makes sense if you’re planning to stay in your home long-term [page:1].
Security Features Worth Having
Multi-point locking systems, anti-lift mechanisms, and toughened glass aren’t just security features – they’re insurance requirements for many policies. Spending an extra £150-£300 on enhanced security can reduce insurance premiums and provide peace of mind.
Maintenance Reality Check
Be honest about how much time you’ll dedicate to maintenance. Timber looks stunning but needs treating every 2-3 years. Miss this, and you’ll face rot, warping, and expensive repairs. If you want ‘fit and forget’, choose uPVC or aluminium.
Common Mistakes to Avoid
Skimping on Installation
Choosing the cheapest installer often backfires. Poor installation causes draughts, water ingress, and operational problems. Always check FENSA/CERTASS registration, insurance, and recent customer reviews. A good installer might cost £100-£200 more but saves thousands in future repairs.
Ignoring Building Regulations
Some homeowners skip proper certification to save money. This creates major problems when selling your property – solicitors will demand certification or force you to get retrospective approval (expensive and stressful). Always use registered installers or notify Building Control [page:2].
Wrong Size Selection
Measuring incorrectly is costly. Always get professional measurements before ordering. A few millimetres difference can mean complete door replacement. Most reputable suppliers include a site survey in their quote.
Forgetting About Furniture
French doors need swing space outside. Bi-folds need stacking space when open. Consider how your furniture layout works with your door choice. What looks good on paper might be impractical in reality.
Overlooking Track Maintenance
Sliding and bi-fold doors need regular track cleaning. Debris buildup damages rollers and makes operation difficult. Budget time for maintenance or your smooth-gliding doors will become sticky and problematic within a year.