Pricing and Approving Variations Before You Do the Work

Understanding Job Variations

Variations happen on every site. You plan to fit a kitchen but find rotten floor joists under the old units. You quote for retiling and the customer asks for underfloor heating halfway through. A variation is anything that changes the scope of work agreed in the original contract or estimate. It can be customer-driven, like extra sockets or a new door, or site-driven, like discovering structural timber decay or hidden drainage issues. Treat them as normal, not as an emergency excuse to lose money. The key is spotting them, classifying them, and pricing them properly.

Too many tradespeople treat variations as free extras or ad hoc goodwill. That’s how profit disappears and jobs overrun. Every variation draws on labour, materials and often time from subcontractors. You also have overheads to cover for those extra hours on site — fuel, insurance, tool wear, the lot. Don’t forget the knock-on effect: adding work may push other jobs back, costing you in lost productivity and irritated clients. When you recognise a variation, you need to stop, assess costs, and decide if it’s worth taking on and how to charge for it.

Explaining variations to customers is part of the job. They rarely understand how much goes into that extra request. Use straightforward language: explain what you found, what needs doing to make it right, and why it costs extra. Back it up with pictures, simple sketches or a short note on the job sheet. When clients see the issue and the remedy, they’re far more likely to accept the cost. If they don’t, offer them options — a cheaper fix, a phased approach, or a full repair — but get their choice in writing.

Why Discussing Price Upfront Is Essential

Get the price agreed before you touch the extra work. Period. It’s tempting to crack on and hope the customer will be reasonable when you hand over the final bill. That gamble loses too often. Agreeing price upfront avoids arguments, keeps cashflow healthy and protects your reputation. If a customer balks at a cost you’ve already committed to, you’re left with wasted hours and materials. Say you fit extra sockets and the client expects it free because it’s “only a couple of sockets” — that’s where a pre-agreed price saves you from eating the cost.

Being upfront also demonstrates professionalism. Tell the client exactly what the variation involves, give them a written price or a firm verbal estimate confirmed by text or email, and explain the payment terms. If you do call-outs or day rates make those clear from the off — for example, £35 call-out plus labour at £40 per hour, materials at cost plus 10%. Use plain examples from your last jobs: ‘Replacing rotten joists will take XX hours and materials will be about £YY’ — that kind of clarity removes confusion and shows you’re not trying to sneak anything in.

If customers refuse to sign off, put the work on hold. That’s not being awkward, it’s protecting your business. Tell them calmly you can continue once they agree in writing, and give them a deadline for acceptance — 48 hours, for example. If they delay, you keep the right to reschedule and charge for any waiting or remobilisation. Most clients understand and will agree. Those who don’t are often the ones who cause late payments or disputes later on. A short pause on site is a lot cheaper than chasing unpaid invoices and arguing over sums after the fact.

Creating an Effective Approval Process

Set a simple, repeatable process that everyone on your team follows. When a variation appears, stop the work that’s affected and make a note on the job sheet. Photograph the issue, measure, and list the materials and hours you expect to need. Then provide a written variation form or a clear message that lists the extra work, the cost breakdown and the time it will add to the project. Keep the language plain. You don’t need legalese, you need clarity. Make it routine so your apprentices, subcontractors and office staff all know how you want it recorded.

Get the approval in a way that’s easy for the customer and solid for you. A signed paper note on the job sheet is fine if your client is on site. Better still is a text or email that contains the cost and the scope — it’s quick and it leaves a timestamped record. I use texts when I’m on site and follow up with an email when I’m back in the van. If they reply ‘OK’ to your message, that’s usually enough. For bigger sums, require a signature or a formal written reply. Make sure every approval references the original job number and the date so you can tie it back to the main contract.

Include practical rules: every variation must show labour hours, materials cost, and any subcontractor fees. Add a line for contingencies if a job often throws up unknowns — 10% contingency on top of the variation sum keeps you covered. Note whether prices include VAT. If a variation changes completion dates, record that too. Keep copies of all approvals and append them to the job file and invoice. The paperwork might feel dull, but it’s what protects you if a customer later disputes a charge or claims you did unauthorised work.

Train your team to have the conversation, not to hide it. If someone has the knack for explaining technical bits in plain English, let them handle client calls about variations. Role-play common scenarios — customer asks for a cheaper alternative, customer wants to wait until later, customer refuses to sign. Create standard responses: ‘I can do that cheaper but it won’t be as durable’ or ‘If you want to proceed now, the cost will be X; otherwise I can schedule it for the next visit and the price will be Y.’ Consistency makes the process smooth and your clients appreciate the no-nonsense approach.

Practical Pricing Methods for Variations

There are three practical ways to price a variation: fixed price, time-and-materials, and provisional sums. Fixed price works when you can accurately scope the extra work — replacing a window or fitting a shower, for example. It’s tidy for the customer and clean for you, but only use it when you’re confident in the scope. Time-and-materials suits uncertain work, such as uncovering rot or chasing leaks. Quote your labour rate and add materials at cost plus a clear markup. Provisional sums are useful for larger unknowns: set a budgeted figure you can revise once you know the full extent.

Decide your labour rate honestly. Too many blokes undercharge to win work, then flag when a variation comes up. Know your hourly or day rate that covers wages, vehicle costs, tools, insurance and overheads, and stick to it. For materials, use suppliers’ prices plus a transparent markup — 10-20% is common — but be explicit about it. If you’re using subcontractors, include their quotes and any management fee you apply. A simple line showing labour, materials and subcontractor fees keeps the customer informed and makes the maths obvious.

Offer options to help clients decide. Give a standard, economy and premium route for the variation: ‘Option A — replace with like-for-like for £X; Option B — upgrade to better material for £Y; Option C — temporary fix for £Z.’ People like choices, and it prevents the usual ‘I’d have gone for the cheaper one if I’d known’ after the invoice. Also state any expiry on the variation quote — typically 7–14 days — and if accepting will delay the job. That manages expectations and prevents clients leaving decisions open indefinitely while you hold your schedule hostage.

Recording, Invoicing and Avoiding Payment Disputes

Record everything as you go. Use a job book, a digital app, or a folder in the van — whatever you’ll actually use. Note the date, time, who authorised it, and attach photos. When you invoice, present the variation as a clear line item with the approval referenced. Don’t bury extra charges in a long invoice; customers scan and look for surprises. Show the original contract value, the variations with dates and approvals, and the new total. Clean presentation reduces queries and makes it easier for the client to pay without grumbling.

If a customer refuses to pay for an agreed variation, take a calm, step-by-step approach. First, check your records: do you have written approval or a timestamped message? If you do, show it and explain politely. If not, be honest about the gap and see if you can negotiate a smaller payment rather than go straight to legal channels. Most disputes are resolved by clear communication. Keep any escalation professional: final demand letters, mediation, or small claims court are tools of last resort, not first choices — use them only if you genuinely have the documentation.

Prevent disputes by being proactive. Call the client a day before you add any variation to confirm the appointment and re-iterate the cost. When you finish the day’s work, show them what was done and get a signature on the job sheet for the variation. For larger jobs, consider interim invoices for variations so they don’t all pile up at the end. Finally, learn from each dispute: adjust how you communicate, change your paperwork, refine your standard responses. Running a profitable trade business is about controlling small things consistently; that’s how you stop small variations turning into big headaches.

Common mistakes

• –Neglecting to communicate variations promptly to customers, leading to confusion and potential disputes.
• –Failing to account for additional material costs, room hire, or other incidentals in the final price.
• –Not obtaining written consent for variations, relying solely on verbal agreements.
• –Proceeding with work before a price is agreed, risking non-payment or disputes.
• –Underestimating the time and resources needed for variations, affecting other project deadlines.

Questions people ask

What should I do if a customer refuses to approve a variation?

If a customer refuses, ensure they fully understand the necessity and benefits of the variation. If they're still hesitant, document the discussion and proceed only with agreed work. Offering a phased approach, where possible, can sometimes ease concerns.

How do I handle variations that affect the overall project timeline?

Communicate any timeline changes immediately to the client. Adjust your schedule and discuss potential impacts on completion dates. Outlining these changes in your written agreement helps manage expectations and avoids disputes.

Is it okay to proceed with emergency work without prior approval?

In genuine emergencies like safety hazards, proceed but inform the client as soon as possible. Provide an estimate immediately and follow up with details in writing. Quick communication can prevent misunderstandings later.

How detailed should my variation pricing be?

Detailed pricing should include a breakdown of materials, labour, time, and any additional fees. Clarity prevents surprises and helps clients understand the necessity of costs, aiding easy acceptance.

What if the customer doesn't reply to the text?

For anything significant, chase a reply before proceeding rather than assuming silence means agreement. No response doesn't imply consent; ensure you have confirmed approval to proceed.