Day Rate vs Fixed Price for Trade Jobs UK — Which Should You Charge? (2026)

Every tradesperson faces this question on every job: do you charge a day rate or give a fixed price? The answer isn't the same for every job, every trade, or every customer. Get it wrong and you either lose the work or lose money on it. This guide breaks down exactly when each model works, how customers react to each, and how to protect yourself whichever you choose.

The fundamental difference

The core distinction is simple: who carries the time risk?

On a day rate, you charge per day (or per hour) regardless of how long the job takes. If it takes longer than expected, the customer pays more. If you're fast, they pay less. The client bears the time risk. Your daily income is predictable; the total bill is not.

On a fixed price, you quote a total for the job. The customer knows exactly what they'll pay before you start. If it takes you longer than planned, you absorb the loss. If you're efficient, you earn more per hour than your rate implies. You bear the time risk. The customer's total cost is predictable; your earnings per job are not.

Neither model is inherently better. The right choice depends on the job, the client, and your ability to estimate accurately.

When day rate works well

Day rate is the appropriate model when the scope of work genuinely cannot be determined upfront. Common situations include:

• Investigative or exploratory work — fault-finding on an electrical installation, diagnosing a plumbing issue, or a structural survey where you don't know what you'll find until you start. Quoting a fixed price here is guesswork dressed up as certainty.
• Strip-outs and opening-up works — removing old plasterboard, lifting floors, or breaking out old pipework where hidden problems are common. What looks like a half-day job can turn into two days the moment you open a wall.
• Large or ongoing refurbishments — a long-running renovation where scope changes constantly as the client makes decisions, finds issues, or changes their mind. Trying to fix-price this leads to endless variation arguments.
• Regular trade clients who trust you — if you work regularly for a property developer or facilities manager who knows your quality and trusts you, day rate is clean and simple. They budget by the week, not by the job.
• Very small jobs — if a job will take two hours and producing a formal quote takes an hour, quoting is disproportionate. A simple day rate or half-day rate keeps it efficient.

When fixed price works well

Fixed pricing is the right approach when scope is clear and defined before you start. It works best in these situations:

• Defined-scope domestic jobs — a new bathroom suite installation, a boiler replacement, a rewire of a defined area. You know what you're installing, you can see the existing conditions, and you can price it accurately.
• Domestic customers who want certainty — most homeowners hate open-ended costs. A fixed price removes their biggest anxiety and makes it easier to say yes. This is not a small thing.
• Competitive situations — when a customer is getting three quotes, they're comparing total costs. A day rate with "plus materials" is much harder for them to evaluate than a clear fixed price. You're more likely to win with a fixed quote presented professionally.
• Commercial and procurement-led jobs — many commercial clients, housing associations, and councils require a fixed tender price. They cannot approve work without a defined budget commitment. Day rate is simply not an option in these contexts.

How customers feel about each model

This is where most tradespeople underestimate the psychology involved.

The majority of domestic customers dislike day rates — not because they're necessarily more expensive, but because they create anxiety about the unknown final cost. A customer who has budgeted £800 for a job and is given a day rate of £250 has no idea whether the final bill will be £750 or £1,500. That uncertainty is uncomfortable, and many customers will choose a fixed-price competitor even if you're more skilled, more experienced, and your day rate would actually come out cheaper.

There's also a practical problem: some customers on a day rate become clock-watchers. They notice when you stop for a brew. They wonder whether you're moving quickly enough. It introduces a friction into the working relationship that fixed pricing avoids entirely.

Fixed pricing builds trust and removes the customer's biggest anxiety upfront. That has real commercial value. It's not just about covering costs — it's about removing the friction that stops people saying yes.

The risks of day rate

Day rate looks simple but carries its own risks:

• If you're slow or the job runs over, you earn less than expected per day but the customer has no grounds to complain — they're paying for your time. Your income takes the hit without any dispute mechanism.
• If you're fast and efficient, the customer may feel overcharged even though your rate is fair. A customer who pays two full days for a job done in a day and a half may push back — even though speed is a function of experience, not laziness.
• Perception risk — particularly on longer jobs, customers can feel the meter running. Every conversation, every tea break, every trip to the merchant becomes something they're paying for. This can damage the working relationship even when you're doing nothing wrong.
• Harder to win competitive work — when customers are shopping around, a day rate is harder to compare than a fixed quote. You'll lose quotes to competitors who present fixed prices more confidently, even if your total cost would be lower.

The risks of fixed price

Fixed pricing shifts the time risk entirely onto you. The main dangers are:

• Underestimating the job — if you quote £1,200 and it takes double the time due to complications, you either absorb the loss or have a difficult conversation with the client. Neither is a good outcome.
• Scope creep — the single biggest risk on fixed-price work. The customer assumes that "while you're there" you'll also move the radiator, shift that socket, and re-route the pipe. If you've quoted a fixed price with no variation clause, you have a problem.
• Hidden conditions — on domestic work especially, you often can't see what's behind walls, under floors, or above ceilings. Old wiring, corroded pipes, or asbestos-contaminated materials can turn a profitable job into a loss.
• Underpricing to win — the temptation to sharpen a price to win competitive work is real. But if you win a job at a margin that doesn't cover your real costs, you're working for less than your day rate while carrying all the risk. You'll resent the job, and it often shows.

How to protect yourself on fixed price

Fixed pricing is manageable if you build the right protections into every quote:

• Write a clear scope description — spell out exactly what is and is not included. "Supply and fit bathroom suite as specified, including removal and disposal of existing suite, installation of bath, WC, basin and shower enclosure. Does not include tiling, flooring, or any electrical work." If it isn't written down, it's ambiguous.
• Include a variation clause — your quote should state clearly: "Any work outside the agreed scope will be priced and agreed in writing before proceeding." This is not aggressive — it's professional. Most customers respect it.
• State your assumptions — "This quote assumes existing pipework is in good condition. If issues are identified during works, a variation will be raised and agreed before proceeding." This protects you without alarming the client.
• Photograph before and during — document existing conditions before you touch anything. If a client later disputes additional charges for unforeseen issues, photos showing the state of the pipework, wiring, or structure before you started are your evidence.
• Add a contingency — on jobs with any uncertainty, build 5-10% contingency into your price. If you don't need it, it's profit. If you do, it covers you without a variation conversation.

The hybrid approach

Many experienced tradespeople don't use either model in isolation — they use a hybrid that gives clients cost certainty on the main works while protecting against the genuine unknowns:

• Fixed price for labour on the defined scope
• Materials at cost plus a margin (20-30% is standard) — this prevents you from carrying risk on material price changes and is transparent to the client
• Day rate for unforeseen additional works — agreed in writing before any extra work proceeds

Presented clearly in a professional quote, this model is widely accepted by domestic and commercial customers alike. The client knows their baseline cost and understands that genuinely unforeseen work will be handled transparently rather than buried in an inflated fixed price.

Setting your day rate — what to consider

Many tradespeople set a day rate based on what they've "always charged" or what they think the market expects. This is how you end up undercharging. Start from your actual costs:

• Labour cost — your time plus any employees or subbies on the job
• Van costs — fuel, depreciation, insurance, servicing (divide annual van costs by working days per year)
• Tools and equipment — annual tool cost divided by working days
• Overheads — public liability insurance, trade memberships, software, accountant, phone, website — all divided by working days
• Your profit margin — this is not the same as your wage. Profit is what the business makes above all costs, including paying you fairly for your time

Once you know your floor, check market rates. In London, electricians typically charge £300-500 per day in 2026; outside London the range is more commonly £180-300. Gas engineers and plumbers follow similar patterns. Specialist trades and NICEIC/Gas Safe registered engineers command the upper end. Research rates in your specific area before setting yours — what works in Manchester may not reflect what the market in rural Cornwall or central Edinburgh will bear.

Fixing a price — what to consider

A fixed price is only profitable if your estimate is accurate. The discipline of good fixed pricing:

• Estimate labour time carefully — include setup, cleanup, trips to the merchant, and any sign-off or testing time. Tradespeople habitually underestimate because they price the core work and forget the surrounding time.
• Price materials with a margin — 20-30% on materials is standard and widely accepted. You are carrying the risk of price changes, organising supply, and taking responsibility for quality. A margin is fair.
• Add a contingency on uncertain jobs — even on "defined" scope, build in a buffer for the unexpected. 5% on a clean job, 10% where conditions are unclear.
• Don't undercut yourself to win — if your accurate price is £1,400 and you sharpen it to £1,100 to beat a competitor, you're working below your real cost. The customer who picked the cheapest quote is not necessarily a customer worth winning.

Communicating your pricing to customers

Confidence in how you present your pricing matters as much as the number itself. Some practical language:

On fixed price: "For this job I price on a fixed basis, so you know exactly what you're paying before I start. The quote covers everything listed — labour, materials, and disposal. If anything unforeseen comes up during the works, I'll let you know before proceeding with any additional work."

On day rate: "For this type of work I price on a day rate basis — this job isn't something I can fix-price accurately without knowing what we'll find. My rate is £X per day including all labour and standard consumables. Materials are priced separately at cost plus my standard margin. I'll give you a progress update each day so there are no surprises."

In both cases, write it down. A verbal agreement is unenforceable and leads to disputes. A professional, clearly worded quote — whether it shows a fixed price or a day rate with scope — protects you and gives the customer confidence.

The bottom line

There's no universal right answer between day rate and fixed price. The right model is the one that accurately reflects the risk profile of the job and gives both you and the customer appropriate certainty. Use day rate where scope is genuinely unknown. Use fixed price where scope is clear and you can estimate accurately. Use a hybrid where the job has a defined core with genuine uncertainty around it.

Whatever you choose, write it down, define the scope clearly, and include a variation clause. Most pricing disputes don't come from the model — they come from ambiguity that could have been avoided with a well-written quote.