How to Manage Variation Orders on Fit-Out Projects (Without Losing Money)

5 min read · Published by Lintel

Every fit-out contractor knows the feeling. You're three weeks into a CAT B office fit-out, the client asks for something extra — an additional partition run, a change to the ceiling grid, a different finish on the reception desk. You say yes and get on with it.

But by the time the final account comes around, the client has no recollection of asking for it. Or they remember it differently. Or they claim they only agreed to a verbal estimate, not the final figure. And suddenly you're writing off £8,000 of legitimate work because you can't prove the instruction was given.

This is the variation order problem — and it's costing UK fit-out contractors thousands of pounds per project.

What is a variation order in fit-out?

A variation order (VO) — sometimes called a change order or variation instruction — is any change to the agreed scope of works on a construction or fit-out project. It could be a client-driven instruction (“can we add a server room?”), a design change, an unforeseen condition, or a change in specification.

On CAT A and CAT B fit-out projects, variations are common. Clients change their minds. Architects revise drawings. Site conditions differ from surveys. A well-run project captures every one of these changes formally — with a written instruction, an agreed price, and client sign-off before work proceeds.

A poorly-run project handles them informally, over WhatsApp or verbally on site, with the intention of “sorting it out later.” Later usually means a dispute.

For a full explanation of what variation orders are and what they should include, see our guide on what is a variation order in construction.

Why fit-out contractors lose money on variations

The problem isn't that contractors don't do the work. It's that they don't document it properly. There are three failure modes:

1. Verbal instructions with no paper trail

The client's project manager walks the site and says “while you're at it, can you add a couple of extra sockets in the board room?” Your site manager says yes. The work gets done. Nobody writes anything down.

Six weeks later when you include it in the final account, the client's PM has moved on to another project and no-one can corroborate the instruction. You're left trying to prove a conversation happened.

2. Variations raised but never formally approved

Better contractors raise a VO and send it to the client. But they send it as a PDF email attachment, chase it once by phone, and then assume approval because the client didn't object. That's not approval — that's silence.

Without a formal approval mechanism — a signature, a timestamped digital approval, a written confirmation — the client can dispute at any point. And they often do, particularly on larger projects where the procurement team changes between instruction and invoice.

3. Variations priced too low under site pressure

When you're under pressure to keep the programme moving, there's a temptation to under-price variations to avoid a fight. You quote £1,200 for something that should be £1,800 because you're worried the client will push back. Multiply that across ten variations on a project and you've lost thousands before the final account is even raised.

The fix is a consistent process — one that makes raising, pricing, and approving variations fast enough that cutting corners offers no advantage.

The right process for managing variation orders

Here's the five-step process that protects your margin on every fit-out project.

Step 1 — Raise the VO the moment the instruction is given

Don't wait until the end of the week or the end of the project. The moment a client or their representative gives an instruction that falls outside the agreed scope, it needs to be captured. Description, date, who gave the instruction, which project, which area.

This sounds obvious, but the practical barrier is friction. If raising a VO takes twenty minutes and involves opening a spreadsheet, attaching it to an email, and finding the client's contact — it won't happen on site. It'll get done “later,” and later becomes never.

The process needs to take under 60 seconds. Phone out, description entered, submitted. That's the bar.

Step 2 — Price it from your rate card

Every variation should be priced consistently, using your established labour rates and materials prices — not estimated on the spot or negotiated down under pressure. If you have a rate card (and you should), the pricing should be mechanical: quantity × rate, with a clear breakdown the client can read and verify.

A transparent breakdown also makes it harder for clients to dispute. When they can see exactly what they're paying for — two joiners at £45/hr for four hours, plus materials at £380 — there's less room for “I didn't think it would cost that much.”

Step 3 — Get written client approval before starting

This is the step most contractors skip. The work often starts before the VO is formally approved because the programme won't wait. But starting work without approval is where disputes begin.

The practical solution is to make approval fast enough to happen before the work starts. A digital approval mechanism — where the client receives an email with a single button to approve or reject — can close in minutes rather than days. If the client refuses to approve before work starts, that refusal is itself a documented record.

Step 4 — Chase unapproved variations

Sent but not approved is not the same as approved. Set a follow-up window — 48 hours is reasonable on most fit-out projects — and chase any outstanding approvals systematically. If you're doing this manually, it will fall through the cracks. If it's automated, it won't.

An automatic chase at 48 hours also removes the awkwardness of chasing clients directly. The system does it, not you.

Step 5 — Track everything in one place

At any point in a project, you should be able to answer: how many VOs are outstanding? What's the total value of approved but uninvoiced variations? Which variations haven't been approved yet?

If that information lives across a spreadsheet, your email outbox, and your site manager's WhatsApp messages — you don't have control of your VO position. And at final account, that's where the money goes.

The cost of getting this wrong

Industry data suggests fit-out contractors lose an average of £28,000 per project on undocumented or disputed variations. On a £500,000 CAT B fit-out running at 12% margin, that's more than half your profit on the job.

The frustrating thing is that the work was done. The cost was incurred. The margin was earned — it just wasn't captured. That's not a site problem or a commercial problem. It's a process problem.

And process problems have process solutions.

How Lintel helps

Lintel is variation order management software built specifically for UK fit-out contractors. It handles the entire VO lifecycle — from raising on site to client approval to invoice export — in a single tool.

Raise a VO on your phone in under 60 seconds. Lintel auto-prices it from your rate card. The client receives a VOSign approval email with a single tap to approve. If they go quiet, Lintel chases them automatically at 48 hours. Every approved VO flows into a variation schedule you can export as a clean PDF and attach to your invoice.

No more disputed variations. No more margin lost to poor documentation. Every change, captured and approved.