The short answer
The price of a composite door is driven mainly by its size, glazing, colour, hardware, core construction, brand, frame and the fitting scope. A plain standard-size slab in a common colour with minimal glazing sits at the bottom of the range, while a large, decoratively glazed, bespoke-coloured door with premium hardware and side panels sits at the top. Fitting adds labour, removal and sealing, and any structural change to the opening adds more. Because installers package these elements differently, two quotes for what looks like the same door can differ by hundreds of pounds, so understanding the factors helps you compare fairly.
Several distinct factors move a composite door quote; knowing each one explains why prices vary so widely and helps you read a quote properly.
Quick reference
- Biggest factorSize and glazing
- ColourStandard lowest-cost, bespoke dearest
- CoreSolid-core dearer than foam-filled
- FittingLabour, removal, frame, structural
The main price factors
Composite door prices vary because of a handful of specification choices. The table summarises the main factors and the direction each moves the cost, for guidance rather than as fixed figures.
Size and glazing usually have the biggest effect, followed by colour and hardware. Core construction and brand set the baseline quality and price, while the frame and fitting scope determine how much of the total is labour and building work. Understanding which lines are driving a quote helps you decide where to spend and where to economise.
| Factor | Effect on price | Why |
|---|---|---|
| Size / double doors | Higher | More material, bigger frame |
| Glazing | Higher | Decorative / double glass costs more |
| Colour / finish | Standard cheaper | Bespoke shades cost extra |
| Hardware / security | Higher | Upgraded locks and furniture |
| Core / brand | Higher | Solid core, recognised maker |
| Frame / fitting | Higher | New frame, labour, structural work |
Indicative direction of effect for guidance. Sources: Checkatrade and MyJobQuote door cost guides.
Specification choices
On the door itself, the choices that move the price most are:
- Size and configuration — non-standard widths, taller doors, double doors and side panels all add material and frame cost.
- Glazing — a solid slab is lowest-cost; obscured, decorative, bevelled or coloured double glazing adds more.
- Colour and finish — standard colours are lowest-cost, with bespoke shades, dual colours and woodgrain finishes costing extra.
- Hardware — the handle, letterplate, knocker, numerals and especially the locking system can lift the price, and accredited high-security locking adds more.
- Core construction — a solid-core composite slab generally costs more than a foam-filled GRP door.
Brand matters too: recognised manufacturers often command a premium over unbranded equivalents, reflecting their warranty, consistency and accreditation.
Frame, fitting and the opening
Beyond the door, the rest of the quote depends on the fitting scope. Replacing the whole frame costs more than reusing the existing one, but a slab fitted to an old frame may not seal or last as well. Labour varies with the complexity and your location, with rates generally higher in the south-east. Removal and disposal of the old door, sealing, trims and making good all add to a fitted figure.
The biggest swing comes from the opening itself. A like-for-like replacement into an existing opening is predictable, but widening a wall for a larger door or side panels is a structural change needing a lintel or steel beam, brickwork, plastering and separate building control approval. That can add a significant sum on top of the door, so it is worth deciding early whether the opening is changing.
How to read a quote
Because installers bundle these factors differently, the best way to compare is to fix your specification first, then ask each installer to quote for that exact door and to itemise the lines. A quote that separates the door, the glazing, the colour, the hardware, the frame, the labour, removal and any structural work is far easier to judge than a single lump sum, and makes it clear where any difference between quotes comes from.
Check whether VAT is included, as a net figure adds twenty per cent. Confirm whether the price is supply-only or fully fitted, since this is a common source of confusion when comparing. Ask about the warranty on the slab, glass and hardware, and whether the installer is registered with FENSA or an equivalent scheme so the glazing is self-certified. The lowest-cost headline figure is not always the best value once you account for the door brand, the core construction, the scope included and the installer's accreditation. By understanding the factors behind the price, you can decide where the extra cost is justified, such as a solid core and good lock on a main door, and where you can sensibly economise, such as a standard colour or simpler glazing.
Frequently asked questions
Why are some composite doors so much cheaper?
A cheaper door usually has a foam-filled rather than solid core, a standard size and colour, minimal glazing and basic hardware, and may be unbranded. The price can also exclude fitting, a new frame or VAT, so always check what the figure covers.
Does colour affect the price?
Yes. Standard, popular colours are the lowest-cost, while bespoke shades, dual-colour finishes and woodgrain effects add to the cost. Choosing a common colour is one of the simplest ways to keep the price down.
Is a solid-core door worth the extra cost?
A solid-core composite slab feels more substantial and can offer better durability and security than a foam-filled door, which many homeowners value on a main entrance. For a low-traffic secondary door, a cheaper core may be adequate.
Sources & further reading
- Checkatrade — composite doors buying guide
- MyJobQuote — new front door cost
- HomeOwners Alliance — front doors guide
Figures on this page are typical UK ranges drawn from published sources and depend on your specific door and opening. They are guidance, not a quotation.