One of the biggest worries homeowners have about building projects is going over budget. The good news: with the right approach, most overspends are avoidable. Here's a practical guide to setting a realistic budget and keeping control of it throughout your build.
The golden rule
Never spend your entire budget on the build itself. Always hold back a contingency — and treat it as money you're not allowed to touch unless something unexpected genuinely requires it.
Set a Realistic Total Budget — Not Just a Build Budget
Your total project budget needs to cover more than just the builder's quote. Before you agree to anything, add up all the costs involved:
Get a Detailed, Itemised Quote
A professional builder provides a comprehensive, itemised quotation — not a single lump sum. Your quote should clearly show what is and isn't included. Common exclusions to watch for:
Tip: Ask your builder to walk you through the quote line by line. Any item you're unsure about — ask. A good builder will explain clearly.
Build In a Contingency — Always
No matter how thorough the planning, building projects can throw up surprises. The most common unexpected costs include:
Tip: As a rule of thumb, hold back 10–15% of your total budget as contingency. On a £60,000 project, that's £6,000–£9,000 set aside and untouched unless genuinely needed.
Understand How Variations Work
A variation is any change to the agreed scope of work after the contract is signed. Every variation should be agreed in writing before work proceeds — with a clear cost and any impact on the programme. Common causes of variations:
Tip: Never agree to additional work verbally. Always ask for a written variation order with the cost clearly stated before saying yes.
Track Your Spending as You Go
Keep a simple running total of everything you're spending — not just the stage payments to your builder, but every associated cost. A basic spreadsheet works perfectly. Track:
Understand the Payment Schedule
Reputable builders work on stage payments linked to progress milestones — not large upfront deposits. A typical payment schedule might look like:
Tip: Never pay for work that hasn't been done yet. If a builder asks for a large upfront payment before starting, that's a red flag.
Avoid Mid-Build Upgrades (Unless You've Budgeted for Them)
One of the most common ways projects go over budget is through upgrade creep — small decisions during the build that each seem reasonable but add up significantly. Examples:
Tip: If you want to upgrade something, go back to your budget spreadsheet first. Can you afford it from your contingency? If not, save it for a future phase.
Budget Summary: What to Expect
How We Help You Stay on Budget
At Paul Bailey Construction, we believe in complete transparency from day one. Our approach to budgeting:
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