Twelve Things to Nail Down Before a Composite Door Surveyor Knocks

Booking a composite door survey can feel like the point of no return. In reality, it is just a conversation with a tape measure attached. The trouble is that plenty of homeowners treat it as a formality, then discover halfway through the order that nobody discussed drainage, making good or who actually backs the guarantee. A few direct questions beforehand can save a lot of polite but firm phone calls later.

A good surveyor should welcome this list. If they squirm, that is useful information too.

Start with the people and the paperwork

1. Who employs the person standing in my hallway?

Is the surveyor directly employed by the company, a subcontractor, or a self-employed fitter working under the firm's banner? None of those answers is automatically bad, but you should know who has responsibility if something goes wrong. Ask for the trading name, company number and registered address in writing.

2. Which accreditation can I check myself?

Competent-person scheme membership is worth confirming rather than admiring on a certificate. If the company claims to be part of a scheme such as FENSA or CERTASS, ask for the registration number and check it on the scheme's own website. Accreditation is not a magic wand, but it gives you a route for advice and redress if the work falls short.

3. What does the guarantee actually cover, and who is behind it?

A ten-year guarantee sounds brilliant until you read the small print and find it covers the frame but not the hinges, or the glass unit but not the labour. Ask what is covered, what is excluded, how long each part lasts and whether the policy is insurance-backed. An insurance-backed guarantee is designed to still mean something if the installer stops trading.

4. Is my deposit protected if the company goes under?

Deposits are normal for made-to-measure doors, but the protections vary. Ask how the deposit is held and whether it is covered by a deposit protection scheme or insurance. Get the answer in writing before any money changes hands. A glossy brochure is not a financial protection policy.

Measuring, making and making good

5. Will the person who measures also fit the door?

Sometimes yes, sometimes no, and both can work. The key is communication. If a separate fitting team takes over, ask how the measurements and any awkward details are passed on. You do not want the surveyor noting a wonky reveal in a little black book that never reaches the person with the silicone gun.

6. What happens if the opening is out of square?

Older UK homes are rarely plumb, level and true. Ask how the company deals with uneven brickwork, a tired lintel, rendered reveals or a threshold that has seen better decades. Will making good be included, priced separately or left to you? Get the likely range of remedial costs discussed before the door is ordered.

7. What is excluded from the quote?

This is the question that separates a clear quote from a hopeful one. Brickwork repairs, plastering, skirting, decorating, old-door disposal and parking permits may all sit outside the price. Ask for a written list of inclusions and exclusions. If the answer is that everything is included, ask them to write that down too.

8. How will you protect the house and remove the old door?

A front-door replacement creates mess and noise. Ask whether dust sheets, floor protection and old-door removal are standard. Confirm where the old door goes and who is responsible for taking it away. It is a small detail until you are left with a battered upvc door leaning against your wheelie bin.

The specification questions

9. Can I see the full door specification in writing?

You want more than a colour and a picture. Ask about the frame material, reinforcement, glass specification, thermal performance, weather seals and the threshold. If the door is sold on energy efficiency, ask for the relevant U-value or energy rating in writing. If it is sold on security, ask what exactly makes it secure.

10. What security features are included as standard?

Locks, cylinders, hinges and reinforcing plates should not be vague. Ask about the locking mechanism, whether the cylinder is snap-secure or anti-bump, and what testing the door has been through. Good security is a system, not a single shiny lock. Ask how the door meets UK security expectations and whether the hardware is covered by the guarantee.

11. How is the threshold and drainage handled?

Water is patient. A poorly detailed threshold or blocked drainage path can turn a smart door into a damp problem. Ask how rainwater is directed away, whether a low aluminium threshold is suitable for your opening, and how the door seals at the bottom. If you have a step or a sloping path, mention it now rather than on fit day.

12. What is the snagging and aftercare process?

Even good installations can need a tweak after a few weeks as the door settles. Ask how you report a problem, how quickly someone responds and whether adjustment visits are included. Find out who you call in year one and who you call in year eight. A clear aftercare process is a sign that the company expects to still be around.

The answer that matters most

You are not looking for a surveyor who can recite a sales script. You are looking for one who answers plainly, puts the important bits in writing and does not mind you checking the paperwork. If a question is met with a sigh, a distraction or a promise that it will all be sorted, slow down. A composite door is a long-term purchase. The pre-survey conversation is your chance to see how the company behaves when you ask for clarity.