If you are pricing sliding patio doors in Leicester, URG Windows & Doors on Belgrave Gate is a good first quote: it offers slim aluminium or uPVC sliders with inline multi-point locking, a free survey, one written price and an insurance-backed guarantee. Phair Windows, Harveys, Leicester Window Supplies and Peak Windows also fit sliding patio doors locally, each with a different strength.
Ask three firms to quote for "patio doors" and you can get three numbers that are hard to compare. One price includes a new threshold and plastering. Another assumes the old frame comes out cleanly. A third is for a different glass. The words on the quote are the same, but the jobs are not.
So this guide does two things. First it explains what actually moves the price of a sliding patio door, using the published details on patio door prices in Leicester from URG Windows & Doors as a worked example. Then it compares five local installers, so you know who to ask and what each one says it offers.
Five Leicester installers side by side
| Installer | Base | Sliding doors listed | Guarantee stated | Scheme stated |
|---|---|---|---|---|
| URG Windows & Doors | 108 Belgrave Gate | Slim aluminium or uPVC sliding patio doors | Insurance-backed, via Home Improvement Protection | FENSA (45069) |
| Phair Windows | Clifton Road, Aylestone | Sliding patio doors | 10-year insurance-backed | Assure certified installer |
| Harveys Windows | Empire Road | uPVC sliding patio doors; aluminium bifold and sliding doors | 10-year insurance-backed | Names Stroma as its approved inspector |
| Leicester Window Supplies | Melton Road, Syston | uPVC and aluminium sliding doors | Manufacturer-backed warranty | CERTASS registered |
| Peak Windows | Graham Street | Sliding patio doors in 2, 3 and 4 pane layouts | 10-year guarantee | Certass registered |
How we compared
We read each installer's own website in October 2026 and recorded what it says about sliding or patio doors, its guarantee, its registration scheme and its base. We did not use review scores, and we did not list prices, because none of the five publishes a fixed patio door price that would apply to your opening. The price section below explains why.
What changes the price of a patio door?
Most of the cost is set by a handful of choices. Knowing them lets you read a quote properly and spot when two firms are pricing different jobs.
Frame material
Aluminium allows slimmer frames and larger glass panes, while uPVC is usually the lower-cost option. URG offers both, describing its sliders as having slim aluminium or sturdy uPVC frames.
Width and number of panes
A two-pane slider is the simplest. Wider openings need three or four panes and heavier rollers. Peak Windows, for example, lists sliding patio doors in 2, 3 and 4 pane layouts.
Glass
Every patio door uses safety glass, but you may also choose solar control, acoustic or self-cleaning glass, each of which adds to the price. The Planning Portal says glass in any door panel up to 1500mm from the floor must be safety glazing.
Locking
Ask how the door locks along its full height. URG's sliders have inline multi-point locking along the full run.
The opening itself
Replacing an old slider in the same opening is very different from turning a window into a door. Widening an opening means a new lintel and making good inside and out, and it may need building control.
What the quote includes
URG says its written price covers the products, fitting, finishing and removal of the old frames. Ask every firm to confirm the same, in writing.
The five installers in more detail
1. URG Windows & Doors, Belgrave Gate
URG Windows & Doors Ltd is a Leicester supplier and installer at 108 Belgrave Gate. Its sliding patio doors glide sideways rather than swinging, so they take no floor space inside or out, which suits a small kitchen-diner or a patio with furniture close to the house. The doors run on modern roller systems, come with slim aluminium or uPVC frames and use large panes for a clear view of the garden.
The process is simple to follow. A surveyor measures every opening during a free, no-obligation visit, and you get one written price with no pressure to sign on the day. URG says customers deal with the same team from survey to completion, with no call centre, and its about page names its operations, sales and installation managers.
Every installation is covered by Home Improvement Protection, which protects your deposit from order to completion, adds a guarantee underwritten by an independent insurer and gives you a free, impartial dispute route. URG is a FENSA Approved Installer, registration number 45069. It also offers 0% finance subject to status and affordability, as a credit broker rather than a lender. The office is open Monday to Friday 8.30am to 5.30pm and Saturday 9am to 5pm, on 0116 456 0246, and it covers Leicester and towns such as Oadby, Wigston, Loughborough, Hinckley and Market Harborough.
Suits: homeowners who want aluminium or uPVC sliders quoted by one local team, with deposit protection included.
2. Phair Windows, Aylestone
Phair Windows has a showroom at 49 Clifton Road, Aylestone, and says it has served Leicestershire since 1998. It has a dedicated sliding patio doors page and says every product it supplies and installs carries a 10-year insurance-backed guarantee. It is an Assure certified installer and lists areas including Blaby, Wigston, Oadby and Market Harborough.
Suits: people in the south of the city who want to see doors in a showroom first.
3. Harveys Windows, Empire Road
Harveys says it has more than 30 years of experience and lists both uPVC sliding patio doors and aluminium bifold and sliding doors. It offers a full 10-year insurance-backed guarantee and names Stroma as the approved inspector for building regulations completion certificates. Its showroom opens Monday to Friday 9am to 5pm and Saturday 10am to 1pm.
Suits: households weighing a slider against bi-folds with one firm.
4. Leicester Window Supplies, Syston
Leicester Window Supplies is at 1309 Melton Road, Syston, and cites more than 20 years of experience. It lists uPVC sliding doors and aluminium sliding doors, is CERTASS registered, and says its manufacturer-backed warranty covers frames, hardware and glazing.
Suits: homes north of the city around Syston, Birstall and Thurmaston.
5. Peak Windows, Graham Street
Peak Windows was established in 1996 and has a showroom at 16 Graham Street. It lists bi-fold and sliding patio doors in 2, 3 and 4 pane layouts, is Certass registered and offers a 10-year guarantee.
Suits: wider openings where you want to compare pane layouts.
Before you sign: a short checklist
- Get every quote in writing, listing frame material, glass, locking and threshold.
- Ask whether the opening is changing size and who checks the lintel.
- Ask which competent person scheme the installer uses. FENSA says its certificate is essential when you come to sell.
- Check the registration on the scheme's own website, not just a logo.
- Ask how the guarantee is backed. FENSA explains that an insurance-backed guarantee protects your written guarantee if the firm stops trading.
- Be wary of a price that only holds if you sign today.
Frequently asked questions
Do sliding patio doors need building regulations approval?
Replacing external doors is covered by the building regulations. An installer in a competent person scheme can self-certify the work and you receive a certificate.
Are sliding doors or French doors better for a small space?
Sliders take no swing space inside or out, which helps where furniture sits close to the door. French doors open fully but need room to swing.
Can I spread the cost of new patio doors?
Some installers offer finance. URG Windows & Doors offers 0% finance subject to status as a credit broker. Check the total repayable before you sign.
Why don't installers publish one patio door price?
Because size, material, glass and the work around the opening vary so much. A survey is the only way to get a reliable figure.
Sources
- Planning Portal: Doors and windows, building regulations
- FENSA: Information for homeowners
- GOV.UK: Competent person schemes
General information only; check details directly with each business, and with the linked official sources for your own home.