How do window installers stop losing final balances after the fit?

Why the money goes missing

There's no bad debt problem in most window firms. There's a definition problem.

A window sale is usually deposit plus balance on completion. The trouble is that "completion" in this trade is genuinely ambiguous. The fitters finish on Tuesday. There's a scratched cill and a handle that isn't sitting right. The customer mentions it. Everyone agrees it'll get sorted.

At that moment the job silently changes state. In the fitters' heads it's done. In the office it's "waiting on remedials". In the customer's head it's "not finished, so I'm not paying yet". Three different truths and no invoice.

Four weeks later the remedial has been done, nobody remembers to invoice, and the £3,200 balance is now old money — and old money is harder to collect, because the customer has emotionally closed the job.

The second cause is more human. Installers don't like chasing while they still owe the customer a remedial visit. It feels like bad manners. So the chase gets postponed, and the longer it's postponed the more awkward it becomes, until it's easier to say nothing.

What it actually costs

Work out your own number rather than take a figure off me. Add up every balance currently outstanding on jobs where the fitters have left site. For most firms doing £600k to £2m, that number is somewhere between one and three weeks of turnover, sitting still.

Three consequences follow.

You're financing your customers. You've paid the fabricator, paid the fitters and paid for the glass. The customer has the windows. You have an entry on a spreadsheet.

Collection probability decays. Money at ninety days is materially harder to collect than money at fourteen days, and by then the conversation is uncomfortable in a way it never needed to be.

It distorts what you think you're earning. A month that felt good on order value can be a month where nothing landed in the account, and you don't find that out until the VAT bill arrives.

Why chasing manually doesn't work

Because the person who'd do the chasing is the person dealing with the thing that went wrong.

Follow-up is always the first casualty of a busy fortnight, and busy fortnights are exactly when you've fitted the most jobs and therefore have the most balances outstanding. The workload and the collections need peak at the same moment and the same person handles both. That's not a discipline failure, it's a design failure.

What to do about it

Split the trigger from the snagging. Invoice on installation completion. Track remedials as a separate open item on the job. If the remedial is genuinely significant — a wrong-sized frame, a door that doesn't close — hold a proportionate retention rather than the whole balance. Holding £3,200 hostage to a £40 handle is a decision you've made by accident.

Make completion an event in the system, not a feeling. Fitters mark the job complete on their phone before they leave the drive, with handover photos attached. That event fires the invoice. No human decides.

Send a handover pack, not just an invoice. Photos, care instructions, guarantee details, and the compliance certificate details to follow. A homeowner who's just received something that looks professional pays faster than one who's received a bare PDF with a number on it.

Put the reminders on a ladder. Invoice on the day, polite nudge at day seven, direct message at fourteen, phone call task at twenty-one. Written once, applied to every job, no judgement calls.

Make paying take ten seconds. A payment link in the invoice, card accepted on site. Every extra step between deciding to pay and paying is a place where a customer defers.

Review one list weekly. Jobs fitted, balance unpaid. If that list is longer than five, the problem isn't customers.

Where the certificate comes in

There's a natural completion moment in this trade that most installers waste.

The FENSA or Certass registration produces a Building Regulations compliance certificate the homeowner will need when they sell the property — every conveyancer asks for it. That certificate is a genuinely valuable deliverable arriving after the fit, and it's the perfect anchor for a completion sequence: work done, photos sent, certificate registered, balance settled, all as one professional-looking close rather than three disconnected emails.

If you're fitting in Ireland, the timing runs differently again on grant work. SEAI funds windows to a maximum of €4,000 and external doors to €1,600, and the grant is paid to the homeowner after the works are completed and the paperwork is submitted. Your cash position depends on documentation you don't control being filed promptly, which is exactly the kind of chase that should never depend on someone remembering.

If the problem starts earlier than this — jobs going cold before they're ever sold — read why window and door quotes go cold. If the underlying issue is that nobody can see what state any job is in, start with where a window installer should keep job information.

Where OrderWolf fits

We set the whole chain up and run it: completion marked on site triggers the invoice, the handover pack goes out automatically, the reminder ladder fires without anyone deciding to, and the CRM shows you every unpaid balance and its age on one screen. Live margin tracking sits alongside it, so you can see what a job actually made rather than what it was quoted at.

With GEV, our Irish flagship client, the team recovered roughly 2.5 admin hours per person per day across three months of deployment. Results from one installer — yours depend on your starting point and your market.