Anthracite bi-fold doors and roof lantern open to garden — A1 Window Construction Ltd, Surrey
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Service

Doors

Composite, bi-fold, sliding and French doors — aligned precisely, sealed properly, finished to last.

Getting the Fit Right

A door that sticks, draughts or fails to lock is not just inconvenient — it is a security risk. Every door we fit is aligned to precise tolerances, the frame is plumb and square, and every seal and lock is tested before we leave.

Whether it is a new composite front door, a full-width bi-fold system, or a set of sliding patio doors, the attention to the frame preparation and the installation detail is what separates a door that performs from one that causes problems.

Every frame checked for plumb, level and square before installation

Full multi-point lock testing before sign-off

Correct weatherseal and draught-proofing throughout

New internal and external trim, matched to your finish

Written quotation covering all frames, hardware and labour

Composite doors, bi-fold doors and French doors — A1 Window Construction Ltd

Door Types

Every Type. Every Material.

GRP composite front door installed Cheam Sutton Surrey — A1 Window Construction Ltd

Composite Front Doors

The most secure, thermally efficient door for any home. GRP skin over a solid core — looks like timber, never warps, never rots, never needs painting. Available in dozens of colours and styles.

Solid GRP skin over insulated core

Multi-point locking as standard

Anthracite, Black, Red, Blue, Chartwell Green + more

A-rated thermal efficiency

PAS 24 security rated

Get a Quote
Aluminium bi-fold doors open to garden Cheam Sutton Surrey — A1 Window Construction Ltd

Aluminium Bi-Fold Doors

Open your home fully to the garden. Slim-framed aluminium bi-folds with ultra-smooth operation, weather-tight sealing, and available in any RAL colour.

2, 3, 4, 5 or 6-panel configurations

Traffic door option — no need to fold the whole system

Any RAL colour powder-coated

Low threshold for level access

Multi-point locking throughout

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Aluminium sliding patio doors fitted Surrey — A1 Window Construction Ltd

Sliding Patio Doors

Large-format aluminium sliding doors that glide effortlessly. Minimal frames maximise the glass area, and the running gear is engineered to stay smooth for decades.

Inline and lift-and-slide options

Up to 6m wide openings

Anthracite or any RAL colour

Superior thermal break construction

Low-profile sill options

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UPVC French doors garden access Surrey — A1 Window Construction Ltd

French Doors

Classic double doors in UPVC or aluminium — ideal for conservatory access, extensions, and garden-facing rooms. Outward or inward opening to suit your layout.

UPVC or aluminium frames

Outward or inward opening

Multi-point locking

Full glazed or partially obscure options

Matching side panels available

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Composite Door Range

Style. Colour. Character.

The CompDoor range gives you over 18 colours, multiple style profiles, and configurations including French door and Stable door options. Below is a selection — every door is made to measure and available in any combination inside and out.

CompDoor composite door styles — Winslow, Norfolk, Aston, Middleton, Whitmore, Cambridge
CompDoor French doors and Stable door configurations — A1 Window Construction Ltd

FAQs

Door Questions Answered

How long does a door installation take?

A single door replacement is usually completed within half a day. Bi-fold and sliding door installations take a full day or more depending on the size of the opening.

Are composite doors more secure than UPVC?

Composite doors offer higher security than standard UPVC due to their solid GRP-over-timber core and multi-point locking. All our composite doors are PAS 24 security rated.

Can bi-fold doors be opened from one side?

Yes. We always include a "traffic door" option, which allows you to open one panel independently without folding the entire system — ideal for everyday access.

What is the maximum width for bi-fold doors?

Aluminium bi-fold door systems can span up to 7 metres across. We design and specify each system to suit your exact opening width.

Do you install new frames or just replace the door?

We can do both. If the existing frame is in good condition, we can retain it and replace only the door leaf. If the frame needs replacing, we do that too as part of the same job.

Ready for a New Door?

Free, written quote. Will or Sam will visit your property, assess the opening, and advise on the best solution for your home.