How Much Do Aluminium Sliding Doors Cost in the UK?

Most aluminium sliding door prices online are fitted prices from an installer, with the doors, the labour and the building work in one figure. That makes it hard to see what the doors themselves cost, or to compare one quote with another. This guide separates the two.

It's for homeowners budgeting for an extension or a new rear opening, and for installers and builders pricing a job. We manufacture aluminium sliding doors from Cortizo systems at our factory in Leeds and sell them supply-only, to trade and retail customers. We don't install, so every price here is for the doors alone. Your installer or builder quotes the fitting.

How much do aluminium sliding doors cost in the UK?

These are our guide prices for Cortizo 4700 aluminium sliding patio doors, supplied without installation:

The glazed range is wide because every slider is made to measure. On the 4700, each sash can be from 600mm up to 2,500mm wide and from 1,800mm up to 3,000mm tall, so two doors with the same layout can use very different amounts of aluminium and glass.

The layout sets the overall size, and that sets most of the price. These are the indicative overall widths for each 4700 layout:

We don't publish a separate guide price for each layout. Send us the width, height, layout and glass and we'll quote the exact door.

What does a supply-only sliding door price include?

"Supply-only" means you're buying the finished doors, not the work to fit them. From us, that covers:

• The door, made to your sizes. Cut, machined and assembled in our Leeds factory from Cortizo profile, and quality-checked before dispatch. The frames arrive fully assembled.
• Hardware and locking. Multi-point locking on every sliding sash, anti-lift blocks on all sliding sashes and internally beaded glazing come as standard. Cranked handles in Black, White or Grey are standard, or a D handle at no extra cost.
• Sealed glass units, if you order glazed. The units are made to the size of each frame by our glass supplier and delivered with the frames. Your installer fits the glass on site. An unglazed order is the assembled frames only, and your installer sources the glass.
• Delivery. Mainland UK delivery is included, on our own fleet. You get a delivery date when you order.

Cills, the 38mm add-on and extras such as trickle vents are chosen per door, so check they're on the quote if you need them.

It doesn't cover taking out the old doors, forming or altering the opening, fitting the frames and glass, sealing, making good, or the Building Regulations sign-off. Those are your installer's or builder's work, and their price.

What makes sliding doors cost more or less?

Overall size

This is the biggest factor. A wider or taller door uses more aluminium and a bigger area of glass. A single 4700 sash can be 2,500mm wide and 3,000mm tall, and every pane needs safety glass.

Panel count and tracks

More panels mean more frame, more rollers and more locking. A third track adds more: the 4700 frame is 120mm deep on a double track and 185mm on a triple, and the cill changes with it (180mm or 230mm on a double track, 250mm on a triple). What you get for the extra is a bigger clear opening. A 2-panel door opens about half its width; a 3-panel door on a triple track opens about two-thirds. A telescopic 6-panel layout stacks the sashes at one side.

If you mostly want the view, two large sashes is usually the most economical layout. Pay for more panels and a third track only if you need more of the opening clear.

Glazed or unglazed

Unglazed doors cost less from us because the glass units aren't included, and they have our fastest lead time. They suit installers who source their own glass or need a particular type, such as acoustic or self-cleaning. The glass still has to be bought and fitted, so compare the total, not just the frame price. For a homeowner using a general builder, a glazed order is usually simpler, because the glass units are made to size and arrive with the frames.

The glass specification

The Cortizo 4700 is double glazed only. It takes 28mm units as standard, and the frame takes units up to 34mm, which leaves room for upgrades within double glazing. Solar-control coatings, laminated glass and acoustic glass all change the price.

Some of the glass cost isn't optional. Approved Document K (2013 edition) treats glazing in doors as a critical location. Paragraph 5.2 says glass there should break safely, be robust, be in small panes or be permanently protected. On a sliding door, where the panes run from the floor, that means toughened or laminated safety glass in practice. Big panes also need thicker glass. Our glass thickness goes up with the frame area of the unit, from 4mm at 2.5m² or less to 10mm at 5.6m² or more.

Colour

Our seven stock colours have the shortest lead times: White, Agate Grey, Anthracite Grey, Black, and three dual-colour finishes (Agate Grey on White, Grey on White and Black on White). Dual-colour, with a different shade inside and out, comes at no extra charge. RAL and woodgrain finishes cost more than stock colours. Any RAL colour can be ordered and takes around 2 weeks, and woodgrain finishes take 4–6 weeks.

Threshold and add-ons

The 4700 has a standard 47mm threshold, or an eco-drain low threshold that brings the track closer to floor level. Add-ons include trickle vents for background ventilation and a 3-star anti-snap cylinder upgrade. Each one changes the price a little, so list what you want at the start rather than adding it later.

Why do slimline COR Vision sliding doors cost more?

Our Cortizo COR Vision sliding doors are the minimal-sightline option. The central interlock, where the panels meet, is 20mm, the slimmest in our range. We don't publish a guide price for COR Vision, because size, panel count, layout, glass and colour change it too much for a single figure to be useful. Expect it to cost more than a 4700 door of the same size. The reasons are practical:

• Special layouts. COR Vision offers pocket doors, which slide into a cavity in the wall, and 90-degree corner doors with no corner post. Both involve more work than a standard slider.
• Recessed frames. The frame can be set into the head, jambs and threshold so that almost no aluminium shows. That has to be detailed with the structure and drainage from the start.
• Glass. COR Vision takes 30mm double-glazed units as standard (6mm toughened, 18mm cavity, 6mm toughened), with acoustic and solar-control glass available within the 30mm unit.
• Handling. The panels are large and heavy, and many installations need glass-handling equipment or a crane. Your installer should plan lifting and access, and price it, before the delivery date is set.

COR Vision also takes longer: our lead time is 4–6 weeks in the stocked colours of White, Anthracite Grey and Black, and RAL or other bespoke colours extend that. Choose it when an architect has drawn a sightline a standard patio door can't achieve. Choose the 4700 when you want large panes at a lower cost and a shorter lead time. Our COR Vision guide covers the system in detail.

How much does it cost to install sliding doors?

We can't give you an installation price. We supply and deliver; we don't survey, measure on site or install. Retail customers use their own builder or installer, and trade customers fit the doors themselves. Fitting costs vary too much from job to job to give a useful guide, so get them quoted for your opening.

When you ask for an installation quote, check what it covers:

• Removing the old doors or windows, and disposing of them.
• Structural work. A wide slider needs a lintel or steel beam that won't deflect onto the frame. A new or widened opening should be designed by a structural engineer, and it's priced separately from the doors.
• Measuring. Your installer should measure the finished opening before the order is placed, once any steel is in.
• Handling. How large panes get to the opening, especially through the house or up to a balcony, and whether lifting equipment is needed.
• Glazing on site. The glass is always fitted on site, whether the units come from us with a glazed order or your installer sources them for an unglazed one.
• Fitting, sealing and making good inside and out, including a drainage channel outside a low threshold.
• Certification. An installer registered with a competent person scheme can self-certify the work. Otherwise it has to be notified to building control.

If you're buying the doors yourself, agree with your installer before ordering who measures, who receives the delivery and who fits the glass.

Do sliding doors need upgraded glass to meet Part L?

The Building Regulations can decide the glass, and the glass affects the price, so check this before you budget.

In England, Approved Document L, Volume 1 (2021 edition incorporating 2023 amendments) sets a maximum U-value of 1.4 W/m²K in Table 4.2 for new or replacement doors in an existing home, including doors in an extension. Doors with more than 60% of the internal face glazed, which covers almost every sliding door, can meet a Doorset Energy Rating of Band C instead. The 2026 edition, which takes effect on 24 March 2027, keeps both standards in its Table 3.2.

Our Cortizo 4700 sliding doors start from 1.4 W/m²K with our standard Ug 1.0 double glazing, which meets that limit. COR Vision is also double glazed only, and is usually assessed on its Doorset Energy Rating. Whole-door U-values change with size and glass, so ask us for the figure for your actual door before you price it.

The extension glazing limit

If the doors are going into an extension, paragraph 10.7 of Approved Document L limits the total area of windows, rooflights and doors to 25% of the extension's floor area, plus the area of any windows and doors the extension removes or covers. Big sliders use that allowance quickly. It can still be approved, by showing the extension performs as well as a compliant one (paragraph 10.9) or with a full SAP calculation (paragraph 10.10). Either may mean paying an energy assessor, or upgrading the walls, roof or floor, so it belongs in the budget. Our guide to aluminium sliding doors has a worked example.

What should a sliding door quote include?

Two quotes for "a 3-metre slider" can describe quite different doors. Before you compare prices, make sure each quote states:

1. The system and who makes it. Which aluminium system it is, and who fabricates the doors.
2. The exact sizes, the number of panels, which are fixed and which slide, the number of tracks and the frame depth.
3. The whole-door U-value (Uw) for that size and glass, not the centre-pane figure (Ug).
4. The glass: unit thickness, safety glass type, any coatings, or whether it's unglazed.
5. The colour inside and out.
6. The threshold and cill, and any add-ons.
7. The locking specification, including locking on each sliding sash and anti-lift protection.
8. Delivery and whether it's included.
9. VAT, and whether the price includes it.
10. Lead time, and when you'll get a delivery date.
11. The guarantee: what it covers, for how long and on what conditions.

If an installer's fitted quote doesn't split the doors from the labour, ask them to. Then you can check the door specification against a supply-only quote. We price-match comparable like-for-like quotations, so send yours to sales@mazuli.co.uk.

Is it cheaper to buy sliding doors at trade?

There are three common ways to buy aluminium sliding doors:

• Fitted, from an installer. The installer buys the doors from a fabricator and quotes one price for supply and fit. It's the simplest route, and the installer takes responsibility for measuring and the finished job.
• Supply-only, as a homeowner. You buy the doors direct from a manufacturer like us and have your own builder or installer fit them. You see the door price on its own and choose the specification yourself, but you need someone to measure accurately and be ready for delivery.
• At trade, as an installer or builder. You buy on an account at trade prices and fit the doors yourself.

Buying from us is manufacturer-direct, so there's no distributor in the chain adding a margin. Our trade accounts have no minimum order value and no lengthy application process. We set accounts up the same day and send a bespoke trade price list within hours. Pricing is volume-based, so it improves as you order more, and every account has a dedicated trade account manager. Our guide to buying aluminium windows and doors at trade covers what to look for in a supplier.

Is the cheapest sliding door quote the best value?

Not always. Three things that don't show on the price can cost you later.

Lead time

Most UK aluminium fabricators quote 3–6 weeks. While you wait, an extension may sit boarded up, and a builder may have to come back for a second visit. We make our sliding doors in-house in Leeds:

We deliver on our own fleet, with our own drivers, and you get a delivery date when you order, so your installer can book the fitting day around it. Our lead times guide explains how to plan a build around them.

Hardware and security

The rollers carry the weight of very large panes, and the meeting edges and the chance of lifting a sash off its track are the weak points on any slider. Compare the locking points, anti-lift protection and how the glass is held in, not just the frame colour. Our 4700 doors have multi-point locking on every sliding sash, anti-lift blocks and internal glazing beads, so the glass can't be taken out from outside.

The guarantee

Our guarantee on sliding patio doors covers the aluminium profile and powder coating for 10 years, sealed glass units for 5 years, and locks, hardware and handles for 1 year. It assumes correct installation and maintenance every six months. Compare the terms, not just the headline years.

If you're still deciding between door types, our bifold door cost guide sets out the equivalent prices for bifolds, and our guide to aluminium bifold doors compares the two.

Mazuli aluminium sliding doors

Mazuli is a Cortizo-accredited manufacturer in Leeds. We make Cortizo 4700 and COR Vision sliding doors at our 25,000 sq ft factory and supply them to trade and retail customers across the UK mainland, delivered on our own fleet. Factory visits are welcome by appointment, Monday to Friday.

See sizes, colours and configurations on our aluminium patio sliding doors and COR Vision sliding doors pages, or request a quote with your sizes, layout, glass and colour. Installers and builders can open a trade account the same day. You can also call 0113 827 5596 or email sales@mazuli.co.uk.