Replacement doors: composite, uPVC and timber compared

If you are choosing between composite, uPVC and timber for a replacement door in England, you expect one material to be best for security, one for heat loss and one for upkeep. The two sources covered here do not give you that table. They explain where to check a company and how police assess security, and they leave the direct comparison of materials to your own checks.

That limit shapes how you should read this guide. It shows what the Glass and Glazing Federation publishes for homeowners and the trade, what Secured by Design publishes about crime prevention, and what neither page publishes about composite, uPVC or timber. You can then ask sharper questions of any quotation instead of relying on a generic claim about a material.

01 What the two pages put in front of you

The federation page divides its audience in two, with one route marked for homeowners and one marked for trade. Around those routes you find a search by company name, a member login, the latest news and events. The trade side lists executive groups for glazing and for home improvement, with pages that set out rules, a code of conduct and board details.

The police initiative page takes a different angle. It describes itself as the official police security initiative, owned by UK Policing, with the specific aim of reducing crime and helping people live more safely. It offers separate routes for people who want to protect home and belongings, for built environment professionals, for members and for police users.

02 Does the door material decide security on its own?

No, not in the way these pages describe it. Secured by Design explains its work as improving security of buildings through design and police-approved standards, accrediting products and practices that meet crime prevention standards, and promoting the use of recognised products across the UK. Only members can obtain product accreditation under the Police Preferred Specification.

That framing matters when a brochure praises a composite skin or a solid timber core. The pages do not publish test results by material and do not state that one material passes while another fails. You need to ask which named standard the complete doorset meets, including frame, locks, hinges and installation, and whether the logo shown relates to that exact combination.

03 Efficiency without numbers on the page

Heat loss is where readers often want a number, usually a U-value or a rating band for the whole door. The federation page mentions an energy savings calculator in its list of sections, but the page itself does not publish figures, worked examples or thresholds for doors. It does not compare heat loss from composite with heat loss from uPVC or timber.

You can still keep efficiency in view by judging the door as a complete fitted unit. Look at how glass details, frame and seals are described together in the quotation. If you want context on the industry body behind member firms, you can read the Glass and Glazing Federation site and see how it keeps homeowner advice separate from trade support. The page does not give a numeric limit, so ask the supplier to write the thermal detail down.

04 Upkeep and what the membership pages can tell you

Upkeep is often described in sales talk as no maintenance or regular painting, but neither source uses those labels for doors. What the federation page does publish is the structure around a company: membership details, a code of conduct, rules, health and safety compliance information and a privacy policy for the group. Those sections do not tell you how often to wipe seals or recoat timber.

Read that as a practical filter. A clear company name that appears in search, a readable complaints route and a quotation that names hardware, finish and aftercare together tell you more than a material label alone. Treat any upkeep promise as text to be added to the contract, with product names and time scales stated.

05 How do you check a security claim before you sign?

Start with the complete doorset, not the leaf. Ask who made the door, who made the lock and cylinder, who supplies the hinges, and who fits the whole assembly in your opening. Then ask which accreditation the exact combination holds and whether your chosen size, glazing option and hardware match the accredited scope.

You should also ask how the lock behaves when the door is pulled shut, how the cylinder is protected against attack, and how hinges resist lifting on outward opening doors. The locks, hinges and testing guide shows why those points sit together in a secure door. The source pages do not publish hinge grades or cylinder dimensions, so hold the order until the link to a named specification is in writing.

06 Where MyGlazing and member search fit in your check

The federation page invites companies to join to connect with consumers through MyGlazing.com and describes support for the glazing industry. From your side, that means two simple uses. Use MyGlazing.com to read consumer-facing advice, and use the find a member search by company name to confirm that the name on your quotation matches the list at the time you pay.

The page also lists the latest news items dated 7 May 2026 and 24 April 2026, without summaries on the page itself. Those dates add no door facts, but they remind you to check that advice is current and that receipts keep a clear trail of who did the work.

07 What to ask next when the page stays silent

Because the pages do not publish a comparison of materials, your questions have to carry that weight. Ask for the doorset standard in writing, the thermal detail for the exact size and glazing, the finish warranty with exclusions stated, and the aftercare that keeps seals and drainage working. For the wider rules behind thermal claims, the efficiency rules explained for England help you see why fitting matters as much as the leaf.

The Glass and Glazing Federation is the industry body behind ggf.org.uk. The site offers a homeowner route and a trade route, a search by company name to find a member, consumer advice through MyGlazing.com, an entry for an energy-savings calculator, news and events, and trade sections covering executive groups, rules, code of conduct and board details. Use the search by company name to confirm the name on your quotation before you pay a deposit.