Retention & Reminders for Builders
Nothing recurs. So retention is the twelve months after handover
The trade with no repeat purchase at all
A single storey extension is £19,450. A dormer loft conversion, £17,200. A garden room, £12,850. A garage conversion, £5,900. An internal wall removal with an RSJ, £2,750.
Almost every other trade on this site has something that comes round again. A boiler is serviced annually. A garden needs maintaining. A house wants redecorating every six years. Even a roof produces gutter work.
You have nothing. The household that spent £19,450 on an extension has finished. There is no second extension, no service interval, no certificate expiring. On any conventional measure, retention does not apply to building.
Which is why most builders leave it alone entirely, and why the trade loses so much value at the exact point where it has the most.
Because there is one thing that recurs, and it is the only asset a builder generates that keeps producing: the household’s willingness to talk about you. That is at its absolute peak in the twelve months after a build finishes, and in most building businesses it is left completely unattended.
Retention for a builder is therefore not about selling them something else. It is about managing the year after the job in a way that converts one build into the two or three that follow it down the same street.
What the defects year actually is, commercially
Most building contracts carry a defects or rectification period, commonly twelve months, during which you return to put right anything that has emerged — a settlement crack, a door that has dropped, a bit of pointing.
Builders treat this as a liability. It is the single most valuable structured contact opportunity in the trade.
Consider what it gives you: a legitimate, expected reason to be back in a house that has just had a large amount of money spent on it, at three, six and twelve months, when the neighbours have watched the whole build, the customer is living happily in the result, and the extension is being shown to every visitor.
Handled as an obligation to be minimised, it produces one grudging visit and a customer slightly annoyed about the crack. Handled deliberately, it produces three warm conversations, a snagging list closed out properly, photographs of the finished space in use, a review, and the referral conversation at the moment it is most likely to land.
The ratio
An extension is £19,450. Our Booked package is £99 a month — £1,188 a year. One extension covers more than sixteen years.
On referral: building work travels down streets more reliably than almost any trade, because the whole road watched it happen. A handover programme that produces one additional referred job a year is £19,450 from work you have already done and been paid for. There is no acquisition cost anywhere in that number.
What we’d actually set up
A scheduled aftercare programme — contact at three, six and twelve months, prompted automatically off the completion date rather than depending on anybody remembering.
A proper completion pack, handed over rather than posted: certificates, warranties, structural calculations, sign-offs, maintenance notes for the finishes. It is what their conveyancer will ask for in eight years, and it is what gets shown to visitors now.
A first-winter note, covering what is normal — drying out, hairline cracking, condensation while the building settles. It prevents the call that starts badly.
The referral ask, at the right moment. Six to eight weeks after completion, when the novelty is at its height and the neighbours are still asking.
A snagging process that closes, with a written list and dates, so the defects year ends cleanly rather than trailing.
A ten-year contact, because the household that extended in 2019 may well be moving, and their buyer inherits a building you know.
What good looks like at twelve months
- Every completed job entering a three, six and twelve month sequence automatically
- A completion pack handed over on every build
- Snagging closed with a written list rather than left open indefinitely
- Referral conversations happening while the interest is live
- At least one job traceable to a neighbour of a previous customer
The mistakes we see most
Disappearing after the final invoice. The most common pattern in the trade and it forfeits the asset the job created.
Treating snagging as an argument. It is the last impression, and it is the one that gets described to the neighbours.
Never asking for the referral. Customers are entirely willing and almost never prompted.
No completion pack. It resurfaces years later as a problem at sale, with your name on it.
The first ninety days
Weeks 1–4. The completion pack template, assembled from the job record so it is a document rather than an envelope.
Weeks 5–8. The aftercare sequence set live against completion dates, and the first-winter note written.
Weeks 9–12. The referral ask built into the six-week contact, and a snagging process that produces a closed list.
At ninety days the measure is whether every job finished this quarter is on a scheduled aftercare programme rather than off the books the day the invoice cleared.
Where this lands in Gaffer
Completion dates drive the aftercare sequence, so a three-month contact happens without anybody holding a date in their head.
Certificates, warranties and sign-offs attach to the job as they arrive, which is what makes the completion pack an assembly rather than a search through three inboxes.
And because snagging items sit against the job with dates, the defects year closes with a record rather than trailing into a disagreement about what was ever agreed.
The other thing that comes back: the building itself
There is a second recurring stream and it is the structure you put up rather than the household who paid for it.
An extension built in 2019 is a building with a life. Flat roofs over single-storey extensions have a covering with a finite life. Render cracks and needs attention. Rooflights need seals and, eventually, replacement. Bifold and sliding doors need adjusting after a few years of settlement. Guttering on the new elevation blocks like any other. Cladding on a garden room weathers.
None of that is dramatic and all of it is work, on a building whose construction you know intimately because you built it. Nobody is better placed to maintain it and nobody else has the drawings.
The commercial point is that these intervals are predictable. A flat roof at year twelve, render at year eight or ten, door adjustments at year two or three. Set against completion dates they become a schedule rather than a hope, and a builder with sixty completed jobs behind them has a maintenance base nobody has ever contacted.
It also does something for the referral engine. A builder who returns at year three to adjust the doors is a builder who is still present in that household when a neighbour asks — nine years after the extension went up, at which point most of the trade has vanished entirely.
The record is what makes it possible. Without knowing what you built and when, none of it can be scheduled.
Questions builders ask
Is aftercare not just free work? The defects period exists either way. The choice is whether it is a grudging obligation or three structured contacts that produce referrals.
When is the best moment to ask for a referral? Six to eight weeks after completion, when the neighbours are still asking about it.
What if the customer is unhappy? Then you want to know at three months rather than at eleven, which is the other reason the sequence exists.
Does any of this bring the customer back? Not as a buyer. As a referrer, repeatedly, for years.
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