How to Manage Subcontractors in Joinery — Sprayers, Fitters, and Specialists

Very few joinery workshops do everything in-house. You might have your own joiners on the bench, but spraying goes out. Or spraying is in-house but installation is subcontracted. Glass might come from a specialist glazier. Stone worktops from a fabricator. Metalwork from a welder down the road. The moment you involve subcontractors, your production schedule is no longer just your schedule — it's a chain of dependencies that you don't fully control.

And that's where things go wrong. Not because subcontractors are unreliable — most are perfectly competent. Things go wrong because of timing, communication, and the gap between your plan and their availability.

The scheduling dependency problem

When production is entirely in-house, you control the sequence. Cutting happens Monday, machining Tuesday and Wednesday, assembly Thursday and Friday. If something runs behind, you adjust the schedule and tell your team directly. The feedback loop is immediate.

With subcontractors, the feedback loop has gaps. Your sprayer might be booked two weeks in advance. If your production runs three days late on a kitchen, you can't just move the spray date — the sprayer's slots are already allocated to other workshops. You either wait for the next available slot, which might be another week out, or you rush to finish and send components to spray when the preparation isn't complete. The first option delays the project; the second risks quality issues and costly rework.

This cascading delay pattern is the single biggest source of missed deadlines in joinery workshops that use subcontractors. The problem isn't the individual delay — it's that a three-day slip at the bench becomes a two-week slip at installation because of the gaps between each handover.

What subcontractors actually need from you

Good subcontractors — the ones you want to keep — care about predictability. They don't mind tight turnarounds if they're planned. What they hate is surprises: "Can you fit this in tomorrow?" or "Actually, it's not ready yet, we'll call you." Every time you change plans on them, you're wasting their scheduling capacity, and they'll eventually start prioritising clients who plan properly.

If you can deliver these five things, you'll become your subcontractors' favourite client. They'll prioritise your work, accommodate the occasional emergency, and flag problems early instead of letting them fester. The cost of being a good client is zero — it's just organisation.

Visibility is the fix, not control

The instinct when subcontractors cause delays is to try to control them more tightly — chase them daily, demand progress updates, add penalties to contracts. This usually backfires. Good subcontractors don't need micromanaging, and bad ones won't be fixed by it.

What actually works is visibility. You need to see, at any point, which projects are approaching a subcontractor handover, whether production is on track to meet that date, and what happens downstream if the date slips. If you can see on Monday morning that Project A's spray date is next Wednesday but assembly is two days behind, you have options: reassign a joiner to catch up, call the sprayer to push by two days while the slot is still flexible, or rearrange another project to fill the gap.

Without that visibility, you discover the problem on Wednesday when the sprayer turns up and the components aren't ready. By then your options are limited and expensive.

Tracking subcontractor costs per project

Subcontractor costs are one of the most commonly undertracked expenses in joinery workshops. You know how much you paid the sprayer this month, but do you know how much spraying cost per project? How much per door? Per square metre of kitchen frontage?

Without per-project cost tracking, you can't quote accurately. If your last kitchen project's spray cost was £2,200 but you quoted the next similar kitchen with £1,800 for spraying because that's "what it usually costs," you've already lost £400 before anyone picks up a brush. The only way to avoid this is to record every subcontractor cost against the specific project it belongs to, every time.

This data also tells you when it's time to bring a process in-house. If you're spending £3,500 a month on external spraying and your volume is consistent, at some point it makes financial sense to invest in a spray booth and hire a sprayer. But you can only make that decision with confidence if you have twelve months of accurate subcontractor cost data.

Communication that actually works

The default communication channel between joinery workshops and their subcontractors is phone calls and text messages. This works for simple, one-off arrangements. It fails completely when you're managing multiple projects with multiple subcontractors simultaneously.

The problem with phone and text is that there's no shared record. You told the sprayer the colour is RAL 9010 on the phone, but he heard RAL 9001. Nobody has a written reference. The doors come back in the wrong shade of white and you're arguing about who said what.

The solution isn't a complex communication platform — it's documentation. Every handover should have a written specification: what's being delivered, quantities, finish details, timeline, and collection or delivery arrangements. This can be a simple document, a note in your project management system, or even a structured email. The format doesn't matter. What matters is that it exists, it's unambiguous, and both sides have a copy.

Using your production system to manage the handovers

The best way to manage subcontractors isn't a separate system — it's including them in the production phases of your existing workflow. If your project management tracks phases like Cutting → Machining → Assembly → Spraying → Installation, the spraying phase is where your subcontractor fits in. You can see it on the Gantt chart. You can assign a date. You can attach the specification. When production reaches that phase, everything the subcontractor needs is already documented.

Joinery Core handles subcontractors this way. They're team members assigned to specific project phases, visible on the production schedule alongside your in-house team. Their costs record against the project. Their timeline is part of the project timeline. You're not managing a separate chain of subcontractors — you're managing one production flow that includes everyone involved.