What Really Matters in Shopfitting
You are running two businesses at once. The margin is lost in the gap between them.
Walk into any shopfitting factory in the country and ask the Production Manager how the week has gone. You’ll get a straight answer in seconds. Units off the bench. What’s on the paint line. Which job is waiting on a delayed carcass or an ironmongery delivery.
Walk onto the fit-out and ask the Site Manager the same question. Same result. Where they are against programme. Which trade held them up. What’s landing on site Thursday night when the centre closes.
Now ask either of them what margin that job is making today — not at final account, today. That answer is vague, and usually optimistic.
That gap, between what the factory and site both know and what the accounts eventually show, is where shopfitters quietly lose money. Not through bad workmanship or a thin order book, but because the numbers arrive too late, and in the wrong shape, to change anything. By the time the job is properly costed, it’s handed over, the team has moved on, and the chance to protect the margin has gone.
Shopfitting is two business models stitched together
This is what makes the sector genuinely harder to run than either construction or manufacturing on their own.
In the factory you have a manufacturing business: raw board, laminates, solid surface, glass and metalwork bought up front, bills of materials, machine capacity, direct and indirect labour, scrap and rework, and finished units sitting on a pallet in the yard waiting for a site that isn’t ready.
On site you have a construction business: applications for payment, valuations, certification, variations, main contractor programmes, subcontracted M&E and flooring, snagging, practical completion and retentions held for a year or more.
Each of those models has its own way of tying up cash. Shopfitting does both, in sequence, on the same job. You fund the materials and factory labour months before you can apply for a penny of it. Then you fund the installation. Then you wait for a signature, a certificate and payment terms. Then you wait again for retention.
💡 On a typical £100k job you can be £70k out of pocket before the first payment lands — on a job that is genuinely profitable.
Scale that across a full order book and you can see why so many shopfitters hit a wall somewhere between £500k and £1m of turnover. The work increases, the projects get more complex, admin explodes, cash tightens, and the business starts running you.
Busy is not the same as profitable
Order book full. Factory at capacity. Three fit-outs running. Everyone flat out. And yet the bank balance never quite reflects the effort.
Growth makes this worse, not better. Every new contract needs board, hardware, factory hours and site labour funded before any of it is certified. Win three good jobs at once and your cash position gets tighter, not easier. Plenty of shopfitters have grown themselves straight into a crisis while making a perfectly respectable gross margin on paper.
The ones that thrive are the ones that know, in real time, how much cash is tied up at each stage of each job, how long it stays there, and exactly when it comes back. We’ve covered the mechanics of that separately in shopfitting cash flow: why it’s not your bank balance.
The numbers that actually matter
Every business has a handful of drivers: the few numbers you can genuinely influence, measure and improve. Focus on those and you stop reacting to last month and start controlling next month. For shopfitters, these are the ones that earn their place.
✅ Margin by job, monthly — and split factory versus site
✅ Estimate versus actual, while the job is live
✅ Cost to complete
✅ Work in progress, and over or under-billing
✅ Variations and change control
✅ Factory labour efficiency and site labour recovery, separately
✅ Materials yield
✅ Scrap, rework and remakes
✅ Materials, stock and bought-in price drift
✅ Retentions
✅ Application-to-cash days
✅ Site preliminaries against programme
✅ Secured workload, pipeline and capacity
✅ A rolling thirteen-week cash forecast
Each of these is explained in the appendix and glossary at the end of this article.
Why standard accounting doesn’t cut it here
General bookkeeping handles buying and selling. It struggles with making, and it struggles with contracting. Shopfitting needs both.
From the manufacturing side you need multi-stage inventory valuation, bill-of-materials costing, and variance analysis so a drift in material usage or factory efficiency gets spotted in weeks rather than at the year end. From the construction side you need revenue recognised on percentage of completion rather than when a product leaves the building, WIP valued consistently, accrued and deferred income handled properly, retention accounted for rather than forgotten, and job costing that runs all the way down to contract level instead of a profit and loss for the company as a whole.
⚠️ Most shopfitters already have Xero or QuickBooks. The problem is almost never the software: it’s the setup.
Set up the standard way, it satisfies Companies House and keeps HMRC happy while telling you almost nothing useful about which jobs are making money and which ones are quietly taking it. If costs are coded to the wrong job, captured late, or missed altogether, your job reports can’t be trusted, your WIP is wrong, and your estimate versus actual comparison is meaningless. You cannot manage margins on blurry data.
And the timing matters as much as the accuracy. If month-end takes three weeks, that’s a fifteen-day delay between something going wrong in the factory or on site and anyone in the office finding out. On a twelve-week fit-out, that’s most of a phase. If your WIP figure is a best guess until the year end, you have no reliable margin data for eleven months of the year.
Then there’s the compliance
Heavier here than in most sectors.
⚠️ CIS. Verification before you pay any subcontractor, deduction at 20%, 30% or nil depending on status, monthly returns, and deductions suffered on your own income reclaimed correctly. Get the reclaim mechanism wrong and you’re lending HMRC money you badly need. Gross payment status, if you qualify for it, transforms your working capital position, and keeping the compliance record clean enough to hold onto it is worth designing into how you run the business.
⚠️ The domestic VAT reverse charge. It changed the cash flow of every subcontractor it touched and it remains one of the most commonly misapplied rules in the sector. Shopfitting makes it harder, because the same job can involve supply-and-fix work that falls within the scheme and goods-only supplies that don’t.
⚠️ VAT liability on the work itself. Standard rate on most commercial fit-out, but the picture changes on conversions, listed buildings, charity and certain residential work. Charge 20% where you needn’t and you’ve made yourself uncompetitive. Charge less than you should have and you’ll fund the difference out of your own margin when HMRC catches up, with penalties and interest on top.
The bit almost everyone underestimates
Cross-functional working is the single biggest lever, and it costs nothing.
When estimating, production, site, buying and finance all work from the same numbers, the arguments stop and the decisions get better. The estimator stops pricing from a labour rate that’s two years stale. Buying sees what a minimum order quantity is really doing to working capital. The Contracts Manager finds out on the 5th of the month that a job has slipped, not at the final account eight months later, while there’s still time to tighten the scope, push the variation claim, challenge a subcontractor’s costs or move the factory schedule.
This is where the right system earns its keep: job costing that talks to your accounts, your applications and your subcontract ledger, and to whatever system you use to plan the factory, so operational and financial data stay aligned instead of drifting into two versions of the truth. For some businesses that’s a well-run set of integrated packages. For others it’s sector-specific software. What matters is that there is one set of numbers, not two.
And the numbers need a meeting. A monthly session where profit and loss, WIP movements, estimate versus actual by job, the cash forecast and the key risks — retentions building up, slow-paying clients, jobs with margin drift — get reviewed by the people who can actually do something about them. That’s the point at which numbers stop being history and start being a decision-making tool. Our strategic planning cycle sets out how that review loop works in practice.
Don’t Leave the Tax Reliefs on the Table
Shopfitting sits across two of the best-served sectors in the UK tax system, and it’s one of the worst at claiming.
R&D tax relief
This doesn’t require a laboratory. Solving a genuine technical problem where the answer wasn’t obvious can qualify: an unusual structural or material solution, developing a new fixing or jointing method, achieving a finish or tolerance nobody on the job had achieved before, adapting to offsite and modern methods of construction, or hitting a sustainability or fire performance standard that was new to you. It’s routinely missed because to the people doing it, it just looks like Tuesday. The rules and the evidence requirements have tightened considerably, so this is one to get properly assessed rather than assumed either way.
Capital allowances
These materially change the real cost of CNC machinery, spray plant, extraction, vans and site equipment — and the rules moved in 2026:
✔️ The Annual Investment Allowance still gives 100% relief on up to £1 million of qualifying plant and machinery a year, for companies and unincorporated businesses alike.
✔️ Full expensing gives limited companies uncapped 100% first-year relief on qualifying new main rate plant and machinery. Assets must be new and unused, and sole traders and partnerships are excluded.
✔️ A new 40% first-year allowance arrived on 1 January 2026 for qualifying main rate expenditure — aimed at spend that couldn’t reach full expensing or the AIA, notably assets for leasing and unincorporated businesses.
⚠️ The main pool writing down allowance fell from 18% to 14% from 1 April 2026 for companies. That only affects expenditure dropping into the main pool, but when it does, relief now arrives noticeably more slowly.
Which route suits you depends on your profit position, your timing and your structure, and getting that choice right before you sign the order is worth considerably more than getting it right afterwards. There’s also the structures and buildings allowance, and the frequently overlooked embedded fixtures in a commercial property you’ve bought, which are often worth a great deal and almost never claimed without someone going looking.
Patent Box
If you’ve developed and protected a product, system or fixing method of your own, this cuts Corporation Tax to 10% on the profits attributable to it. Rare in shopfitting, but genuinely valuable where it applies.
Where to start
You don’t need to fix everything at once. Pick the number that’s currently costing you the most. For most shopfitters that’s either real-time margin by job split between factory and site, or the cash locked up in WIP, unbilled variations and retention. Get that one right first.
💡 Because the real question isn’t whether your numbers are perfect. It’s whether they’re good enough, and timely enough, to make the next decision well.
If they’re not, that’s worth a conversation. Book a free 30-minute call and let’s look at what your numbers are actually telling you.
Appendix and Glossary
Margin by job, monthly — and split factory versus site. Not the margin you tendered. What the job is actually earning right now. And crucially, split between the two halves of the work. A job can look fine overall while the factory made money and the installation lost it, or the other way round. If you only see one blended figure you’ll never know which part of your business to fix, and you’ll keep pricing the next job the same way.
Estimate versus actual, while the job is live. Most jobs start with a clear budget: materials, factory hours, site labour, specialist trades, an expected margin. Once the job starts, that estimate quietly turns into hope. Margin is rarely lost in one big obvious mistake. It’s lost in small extras that never get billed and costs that stop being watched, especially when the business is busy.
Cost to complete. Your accounts tell you what you’ve spent. The harder question is what it will cost to finish: the remaining factory hours, the second and third visits, the snagging. Get that wrong and a job looks profitable right up to the point it isn’t. Rolling forward last month’s estimate is how losses stay hidden. Someone senior who actually understands the job should challenge it every month.
Work in progress, and over or under-billing. This is the heartbeat of a shopfitting business, and it’s the one that explains why your accounts can look terrible one month and brilliant the next when nothing has really changed. In shopfitting the work done, the costs incurred, the invoice raised and the cash received routinely land in four different months. WIP is what puts them back in the same frame. Without it, early months show phantom losses, later months show phantom profits, and nobody can trust a single figure in between.
Variations and change control. Fit-out is the natural home of the unrecorded extra. The site is never quite as surveyed, the client changes a finish, the main contractor asks for something on a Thursday night to keep the handover date. If it isn’t scoped, priced and agreed in writing before you do it, it becomes labour and materials you’ve paid for and may never invoice. Every unsigned variation is an argument you’ll have later, from a weaker position, with the money already spent, instead of what it should be: extra sales at a decent margin.
Factory labour efficiency and site labour recovery, separately. Compare the hours you pay for with the hours you priced. On the factory side, setting, machine downtime, remakes and indirect labour — quality, maintenance, supervision — grow without anyone deciding they should. On site, travel, night and out-of-hours working, waiting for other trades, access restrictions and return visits all cost you money you can’t charge on. Leave any of it out of your job reports and the work looks more profitable than it is, so you price the next one too low. If those costs aren’t recovered, your gross margin is a work of fiction.
Materials yield. Materials are one of the biggest costs on most shopfitting jobs — so how much ends up in the finished job, and how much in the skip? Smarter designs, better cutting layouts and reusing offcuts can turn waste into profit. Don’t rely on an old 10% waste allowance: measure what you actually use and feed it back into your pricing. Less waste, better margins, without winning another job.
Scrap, rework and remakes. Waste is margin you’ve already paid for. Materials bought, hours spent, overhead absorbed, but nothing to invoice. In shopfitting the expensive version is the unit that gets to site, doesn’t fit, and has to be remade and reinstalled: you pay for that one three times over. Put a number on it, by job and by cause.
Materials, stock and bought-in price drift. Bills of materials matter here just as much as in any factory. When board, glass, solid surface or ironmongery prices move, that needs to flow through to the cost of every product and every live estimate, not be discovered at the year end. And slow-moving stock, offcuts and job-specific leftovers are working capital quietly becoming worthless in the corner of the yard.
Retentions. Typically three to five per cent of your turnover is being held by other people, released against dates most shopfitters don’t track, against defects that may already be fixed. Knowing it’s owed isn’t enough. You need an amount, a due date, and a named person chasing it.
Application-to-cash days. Don’t just measure debtor days — it understates the problem badly. Measure the whole cycle: application submitted, valuation agreed, certificate issued, invoice raised, cash received. The gap between what the contract says and what actually happens is your real funding requirement, and it’s usually bigger than anyone expects.
Site preliminaries against programme. Supervision, welfare, access equipment, plant hire, storage, out-of-hours premiums. Priced once at tender against a programme, then spent every single week the job runs. When a fit-out slips because the building isn’t ready, these costs keep running while your income doesn’t. Track them weekly.
Secured workload, pipeline and capacity. There’s no recurring revenue in shopfitting. Track what you’ve won, what’s out awaiting decision, and your actual conversion rate, then look ahead month by month, against both factory capacity and site resource. You might be full today. The question is whether you’re full in six months, and whether the factory and the installation teams are going to be busy in the same weeks.
A rolling thirteen-week cash forecast. Not a budget. A week-by-week view of what’s coming in, what’s going out, and where it gets tight, updated weekly and tied to certification dates rather than hope. It should include VAT, CIS, payroll, supplier payment runs, retentions due and funding headroom.
#Shopfitting #FitOut #Construction #Manufacturing #CashFlow #WorkingCapital #VFD #CFO
