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Thinking of putting in a new patio door? Here are 5 things you need to know before you start.

Putting a new patio door in at the rear of the property is something many homeowners want to do at some point.

When it comes to how much does it cost to put a patio door in, prices for a mid-sized set of patio doors (around 2000mm wide x 2100mm high) average between £900 to £1,200.

However, with some cheap French patio door prices in the market ranging from around £450 for UPVC, this might be the right time to go for it.

Typical “entry level” patio door costs

  • French doors from £450
  • Sliding Doors from £600
  • Bifolding doors from £1,500

Having that extra natural light and easy access to the back garden are probably the main reasons for wanting a new patio door. However, owners also say that adding a large glazed area make the room feel bigger and more “liveable” than before.

Whatever your particular reason, if you are thinking of putting in a new patio door, then here some important things we think you need to consider before you start the job.

Here are 5 things you need to consider before putting in a new patio door.

1)     How Much Does It Cost to Put A Patio Door In?

You clearly must have some kind of budget in mind for the installation of your new patio door. The overall cost of new patio doors will depend upon both the doors themselves, and the amount of labour and materials needed.

Here are some typical situations:

  • Swap your old patio door for a new one.
  • Remove a window and fit a patio door in its’ place.
  • Create an entirely new opening for the door.

Swap your old patio door for a new one

This is the simplest of the 3 options – a straight swap. What you need to allow for is the cost of the door plus fitting.

Depending on the size and style you choose, here are some guide prices for supply & fit patio doors.

Supply & Fit Patio Door Price Guide

Get Prices Online

Remove a window and fit a patio door in its’ place.

If the patio door is to be the same width as the existing window, this job will involve additional labour, removal of rubble / debris and making good around the frame internally and externally.

If the new door is going to be wider than the existing window, then you should consider it the same as creating a new opening in terms of costs.

Where the new door and old window are to be the same width, then you have to remove the brickwork under the window down to floor level. There should be no need for a new overhead loadbearing lintel (unless the old one is damaged).

How much does it cost to put a patio door in place of a window?

  • Cutting out the old brickwork could cost £150
  • Plaster & make good internal and external – about £100
  • Fitting of the patio door £150
  • Cost of 1800mm x 2400mm UPVC Patio door £550 to £600

Total guide price of replacing an existing window and fitting new patio doors can be between £900 to £1,100.

The work is likely to need at least 1.5 to 2 days to complete.

Create an entirely new opening for a patio door.

This is the most complex. Labour intensive, time consuming and therefore also most costly option.

Working on an external wall on your property is surely going to involve a load bearing wall. Removing part of a load bearing wall is not something to be undertaken without proper care and should be done by professional and experienced builders that carry proper insurance cover.

You may not need planning permission to do the work, however, you will need building regulation approval. You should contact the local Building Control Officer before beginning any demolition work.

If you live in a “special” property, such as a listed building, then you must get listed building consent for the work.

How much does it cost to put a patio door in place of a wall?

  • Labour costs for cutting out wall and debris removal around £1000
  • Making good internal and external around £500
  • 1800mm x 2400mm UPVC Patio door £550 to £600

The total guide price for creating a new opening and fitting a set of patio doors can be around £2000 to        £2100.

Summary of new patio door costs

  1. Replace an old patio door with UPVC patio door costs from £600 to £900 and will take a day.
  2. Replacing an existing window and fitting new patio doors can cost between £900 to £1,100 and can take 1.5 days.
  3. Creating a new opening and fitting a set of patio doors can be around £2000 to £2100 and can take 3 to 4 days.

2)     What style of patio door do you want?

There are not really that many different types of patio doors, although you can get them in many shapes and sizes. Some styles, however, may be slightly better suited to some situations than others.

Aluminium Patio Doors

Sliding Patio doors

Probably one of the most often seen style, next to French doors. As the name suggests, they slide to open or close.

The doors fit into lower and upper tracks and slide past each other within the outer frame. Although this means that they do not take up any internal or external space, it also means that they are not well suited to narrow openings.

French Patio Doors

Classic French doors feature many small glazed panes within the door – looking a bit like a chessboard. It’s not obligatory to have the small frames, but it does give the door a more interesting appearance in our opinion.

With the ability to be set to open out or in, they can be well suited for those who don’t want the doors to interfere with internal space.

With larger openings, you will need to use side panels (or a 2nd set of doors), as the individual door panels themselves have a limit on how wide you can make them.

The typical usable limit for a single doors’ width would be about 900mm to 1000mm per door. Thus, giving you a total width including the frame of about 2150mm with a 75mm frame.

Bifold Patio Doors

Gaining in popularity over the last few years the bifold door design has a lot of advantages over the previous two styles.

The first being that you can use them in almost any opening width. The second being that when they are fully open, you get a clear and unobstructed view of your garden.

The door panels, or leaves, slide and fold to the sides of the opening in a zig-zag fashion. They can be set to “stack” to the inside or outside.

Mounted onto rollers that fit into top and bottom tracks, bifold doors are easy to operate. Many owners choose to have them fitted with low level threshold, which means there is nothing to trip over on the way in or out.

The only drawback or downside of bifold patio doors that we can think of is that they cost more than sliding or French doors.

As we showed earlier in this article, you can see the difference in average cost is quite a bit:

Typical UPVC patio door costs

  • French doors from £450
  • Sliding Doors from £600
  • Bifolding doors from £1,500

3)     What type of frames do you want?

There are a few options when it comes to the material that you can use for the doors and door frames, each with its’ own characteristics.

  • Timber – softwood / hardwood / engineered wood / hardwood veneers.
  • Upvc
  • Aluminium


Using wood, for many, is the only way to go, and you can choose from about 4 options.

Softwoods, although cheap, bring high maintenance issues. You need to keep it painted, free from rot or insect attack and it swells or shrinks quite markedly depending on the weather.

Hardwood patio doors cost a bit more, but hardwood last a lot longer with less looking after than softwood.

Engineered timber is a wood composite. In short, layers of timber are glued together, treated, and cut into the appropriate form.

Engineered timber does not have a single “grain direction” and so is less prone to expansion or contraction.

Hardwood veneers are a thin layer of hardwood, about 3mm thick, which is laid onto the surface of a softer wood. Engineered timber is often used as the main material onto which the veneer is laid.

UPVC frames are very popular. They don’t suffer from rot, have very little expansion or contraction, don’t need painting and are relatively cheap in comparison to hardwood or Aluminium.

Aluminium frames are very lightweight and strong. Having good structural strength, Aluminium can be formed into slim frames which are very appealing – more glass, less frame. However, Aluminium patio doors cost more than UPVC.

4)     Patio Door Glass & Glazing.

With so much glass in the doors, it is important to consider safety, security, and energy efficiency.

For full height glazed doors, building regulations would require safety glass. This can be regular toughened glass, or you could go to laminated glazing. Laminated glass, however, is considerably more costly than standard toughened glass.

If you have children running around, you could also consider using some kind of glazing film on the inside.

Security wise, toughened glass with double glazing is quite tough for burglars to break, but you could also add an internal security film to make the doors even more secure. In this instance, the highest security would come from laminated glass.

For energy efficiency, 28mmArgon or Xenon gas filled double glazing gives the best performance. If you use a low emissivity coating (low-e) this makes them even more efficient.

5)     Who is going to do the work?

Choosing a patio door installer for your job is well work thinking about beforehand. There are a couple of ways to go about getting the job done:

  1. Buy patio doors yourself and get a builder to do the work.
  2. Use a double glazing company for everything – supply & fit.

The first option can be an attractive option to some. You can shop around for the best patio door price deal you can find and you are not limited to the product range of a single company.

That’s also true for the contractor, you can get several quotes for the job. However, you need to do your homework first.

You can certainly go online to look for local builders to do the work, but there are also organisations that can potentially guide you to lists of reputable contractors such as:

  • Your local council.
  • Trade associations.
  • Recommended trade schemes.

Checking with your local council first may be a good idea. Their website may list approved traders’ in their Trading Standards section.

There are schemes that also recommend contractors such as:

Check to see if the contractor that you are considering using is a member of a relevant industry Trade Association.

Once you have a shortlist, get recommendations or references from their latest customers – see evidence of similar work that they have carried out (local jobs preferred). Where possible, speak to the referees personally.

Make sure you get things in writing such as a detailed description of exactly what work you are having done. Make sure they are insured for the work.

Ask lots of questions to get all the information you need to compare those contractors (make a list so you can ask the same questions to each contactor).

The second option is probably the simplest of the two. Again, you could easily go online to search for double glazing companies that install patio doors (most, if not all will) in your area.

Get several written quotes from local and regional companies and compare them in your own time.

The double glazing industry has great Trade Associations that pre-vet and continually check their members for competence and quality of work. So if you go for a company that is a member of FENSA. CERTASS, GGF, DGCOS or similar, then you should be confident of ending up with a trustworthy company.

Good luck.

If you want to know more about how much does it cost to put a patio door in your house, then just send us some simple details and we will arrange free quotations for you from our Nationwide panel of trusted installers.

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