You’ve got three quotes for the same extension. £42,000, £48,500, and £54,000. Same project, same house, wildly different prices. One builder is nearly £12,000 cheaper than another. So which one do you pick?
Most homeowners go for the middle quote, thinking it’s the safe option. Some go for the cheapest, hoping they’ve found a bargain. Very few understand why the prices vary so much in the first place.
Here’s what’s actually going on behind those numbers, why cheap quotes often cost more in the long run, and why at Rosebrick we’re rarely the cheapest option but our clients end up better off.
Key Topics Covered
- What’s actually included (or missing) from different builder quotes
- The hidden costs that cheap quotes don’t mention
- Insurance, warranties, and protection you’re paying for (or not)
- Quality differences that don’t show on paper
- Why experience costs more but saves money
- What you’re really comparing when you compare quotes
The Brutal Truth About Comparing Builder Quotes
You’re not comparing three quotes for the same work. You’re comparing three completely different services that happen to involve extending your house.
One builder is quoting to build you a shell with basic finishes. Another is pricing for a complete extension with everything finished. The third has included contingency, professional fees, and long-term warranties.
They all call it “kitchen extension – 25m²” but that’s where the similarity ends.
The Numbers from Our Mansfield Projects:
When we analyse why our quotes differ from competitors, the breakdown typically shows:
- Basic shell extensions: £1,200-£1,700 per m²
- Standard complete extensions: £1,800-£2,400 per m²
- High-quality extensions with proper warranties: £2,200-£3,000 per m²
For a 25m² extension, that’s £30,000 to £75,000 for what looks like the same project on paper.
What’s Actually in (or Missing from) Your Quote
The £42,000 Quote Probably Doesn’t Include:
Building regulations fees (£650-£3,000). Skip hire and waste removal (£400-£1,200). Making good the existing house after work (£800-£2,500). Plastering internal walls (£500-£1,200). Electrical work beyond basic first fix (£1,000-£2,500). Decorating (£600-£1,800). Floor finishes beyond basic screed (£800-£2,000). Any contingency for problems (which will definitely happen).
Add all that up and your £42,000 quote becomes £47,150-£56,200 in reality.
The £48,500 Quote Might Include:
Most finishing work but uses budget materials throughout. Includes some making good but not complete decoration. Has basic electrical and plumbing but minimal outlets. Covers building regulations but nothing else. Zero contingency, so any problems add to the price.
The £54,000 Quote Should Include:
Everything to completion, properly finished. Quality materials and good specifications. All professional fees and regulations. Proper contingency for unexpected issues. Decent warranty coverage. Insurance throughout the build.
The £54,000 quote looks expensive until you realise it’s the only one that delivers what you actually need.
Why We’re Not the Cheapest (And Why That Protects You)
At Rosebrick Developments, we quote properly from day one. This means our prices include things that cheap quotes conveniently forget.
What Every Rosebrick Quote Includes:
Complete specification of work. Every task, every material, every finish is detailed. You know exactly what you’re getting.
All professional fees factored in. Building regulations, structural engineer, party wall if needed. Not “extras” that appear later.
Quality materials as standard. We don’t use the cheapest materials then upsell you later. Our specifications are clear and realistic.
Realistic labour costs. Our teams are skilled, insured, and paid properly. This costs more than cash-in-hand cowboys but delivers better work.
Proper contingency. We include 10-15% contingency because problems happen on every project. Better to plan for it than panic when it occurs.
Long-term warranties. Our work is guaranteed. If something goes wrong years later, we sort it.
Full insurance coverage. Public liability, employers liability, proper protection for you and us.
The Hidden Costs of Cheap Quotes
Cheap quotes stay cheap in only one way: they don’t include stuff. Then halfway through your extension, the “extras” start appearing.
Real Examples from Mansfield Homeowners Who Hired the Cheapest Quote:
Family hired builder at £38,000 for kitchen extension. By completion, paid £52,000 because of “unforeseen” extras that should have been obvious from day one.
Couple saved £6,000 going with cheapest quote. Work failed building regulations three times. Paid another builder £11,000 to fix it properly before they could get sign-off.
Homeowner picked budget builder. Work took 18 weeks instead of 10 because builder was juggling multiple jobs. Extra accommodation costs and eating out added £3,200 to their budget.
Extension built for £43,000 instead of quoted £56,000. Looked fine until they sold three years later. Survey flagged poor workmanship. Had to reduce sale price by £15,000 to account for remedial work needed.
Every one of these homeowners thought they’d found a bargain. All of them ended up paying more than if they’d hired quality builders from the start.
What You’re Really Paying For: Experience and Skill
Experienced builders charge more because they’re worth more. Not because they’re greedy, but because they deliver outcomes you can’t get from inexperienced teams.
The Numbers on Experience:
Builder with 15+ years experience typically charges 20-30% more than someone with 2-3 years experience. But projects completed by experienced builders have:
- 60% fewer problems during construction
- 40% fewer issues in first year after completion
- 90% fewer serious defects requiring expensive remediation
- Half the likelihood of budget overruns
- Quarter the chance of significant timeline delays
At Rosebrick, we’ve been building extensions across Mansfield, Nottinghamshire, South Yorkshire, and Derbyshire since 2014. We’ve completed hundreds of projects. We know what works, what doesn’t, and how to avoid the expensive mistakes that inexperienced builders make constantly.
What Experience Actually Means:
We know local ground conditions. Mansfield soil isn’t the same as Nottingham soil isn’t the same as Sheffield soil. We know what to expect and price accordingly.
We understand local planning. Different councils have different approaches. We know what Mansfield planning officers care about versus what matters in Ashfield.
We’ve seen every problem before. Asbestos, old drains, poor foundations, boundary disputes, party wall issues. Nothing surprises us, so we deal with problems efficiently.
We have established supplier relationships. Better prices on materials, priority delivery, backup options when something is out of stock.
We know proper techniques. Modern insulation standards, damp-proofing that works, structural connections that last decades. This isn’t YouTube builder knowledge.
Insurance and Warranties: The Protection You Can’t See
Cheap builders often skimp on insurance and warranties because most homeowners never check. Until something goes wrong, then it matters enormously.
The Insurance Difference:
Proper Builders Have:
- Public liability insurance: £2 million minimum (£5 million better)
- Employers liability insurance: £5 million minimum
- Professional indemnity: for design work and advice
- Contract works insurance: covers project during construction
- 10-year structural warranty: protects against major defects
Budget Builders Might Have:
- Basic public liability: maybe £1 million, possibly less
- No employers liability: uses “self-employed” workers to avoid it
- Zero professional indemnity: can’t get it due to poor track record
- No contract works insurance: your home insurance supposedly covers it (it doesn’t)
- No structural warranty: couldn’t get one if they tried
What This Means in Practice:
Builder damages your neighbour’s property during works. Proper insurance covers it immediately. No insurance means you’re liable, potentially £5,000-£15,000 out of pocket.
Worker injured on site. Without employers liability, you could face legal action and massive costs.
Major structural defect appears five years later. With proper warranty, it’s covered. Without warranty, you pay £20,000+ to fix it.
The insurance difference between proper builders and cheap builders costs £1,500-£3,000 on a typical extension. Tiny percentage of the total cost but enormous protection.
At Rosebrick, we carry comprehensive insurance on every project. It’s not optional, it’s not negotiable, and it’s factored into every quote we give. You’re protected from day one.
Material Quality: You Get What You Pay For
Builder quotes using “high-quality materials” mean nothing unless they specify exactly which materials.
The Material Quality Spectrum:
Budget Materials:
- Cheapest bricks and blocks available
- Basic concrete for foundations
- Minimum spec insulation
- Budget windows and doors
- Economy roof tiles or felt
- Cheapest internal finishes
Cost per m²: £1,200-£1,500
Standard Materials:
- Decent bricks matched roughly to existing
- Proper concrete mix for conditions
- Building regulation standard insulation
- Mid-range windows and doors
- Standard roof materials
- Reasonable internal finishes
Cost per m²: £1,800-£2,200
Quality Materials (Rosebrick Standard):
- Bricks properly matched to existing house
- Correct concrete specification for ground conditions
- Above-minimum insulation for better performance
- Quality windows and doors with proper guarantees
- Durable roof materials with long warranties
- Good internal finishes that last
Cost per m²: £2,200-£2,800
The material difference adds £20,000-£32,500 on a typical 25m² extension. But that £20,000 buys you:
Better energy efficiency (lower bills forever). Longer-lasting finishes (no maintenance for 15+ years). Proper guarantees on components. Extension that matches your house properly. Work that adds maximum value when you sell.
Cheap materials save money today but cost more tomorrow through higher energy bills, earlier replacement, and lower resale value.
The Labour Cost Question
Skilled labour costs more than unskilled labour. Experienced tradespeople charge more than inexperienced ones. That’s not unfair, it’s reality.
The Numbers:
Budget builder day rate: £150-£200 per day. Often uses cheap labour, minimal skills, corners cut to save time.
Standard builder day rate: £200-£250 per day. Competent work, acceptable quality, gets the job done.
Quality builder day rate: £250-£350 per day. Skilled tradespeople, high standards, work lasts decades.
On a 12-week extension project, the labour cost difference between budget and quality builders is £8,400-£12,600.
That sounds like a lot until you consider:
Quality work takes less time overall (fewer mistakes, less rework). Better finish requiring minimal snagging. Work that passes inspections first time. Fewer callbacks and issues after completion. Extension that adds maximum value to property.
At Rosebrick, we pay our teams properly. This means they’re motivated, skilled, take pride in their work, and deliver quality that reflects well on us and you.
What About VAT?
Most extension work is subject to 20% VAT. Some builders are VAT registered, others aren’t. This creates price differences that confuse comparisons.
The VAT Reality:
Builder quoting £42,000 + VAT means actual cost is £50,400. Builder quoting £48,000 with VAT included might be the same actual price. Builder not VAT registered quotes £42,000 total, but you’re taking risks on their legitimacy and longevity.
Builders register for VAT when turnover exceeds £90,000 (2025 threshold). Successful, busy builders are almost always VAT registered. New or small builders might not be.
At Rosebrick, we’re fully VAT registered. Our quotes clearly state whether VAT is included or additional. No surprises, no confusion, complete transparency.
The Estimate vs Quote Distinction
Some builders give “estimates” not “quotes” and homeowners don’t spot the difference until it’s too late.
Estimates are:
- Rough approximations based on limited information
- Can vary by 25% or more from actual final cost
- Not legally binding
- Often used to win work with low numbers then increased later
Quotes are:
- Detailed breakdowns of specific work
- Fixed prices for defined scope
- Legally binding contracts
- Can only change if you change the work scope
What This Means:
Builder A gives £42,000 “estimate”. Final bill is £53,000 because “problems were worse than expected.”
Builder B gives £48,000 quote for specified work. Final bill is £48,000 (or £50,400 including contingency you approved).
Always insist on fixed-price quotes, not estimates. At Rosebrick, every quote we provide is a fixed price for the specified work. Changes only happen if you request them, and we price them clearly before proceeding.
The Specification Detail Problem
Vague specifications let builders quote low then charge extras. Detailed specifications cost more upfront but protect your budget.
Vague Quote: “Kitchen extension 25m², brick to match existing, tiled roof, bifold doors to garden, electrics, plumbing, all finished to good standard.”
What does “good standard” mean? Which bifold doors? How many electrical sockets? What flooring? What tiles?
Every vague element is a place where the builder can install cheap options then charge extra for what you actually wanted.
Detailed Quote (Rosebrick Style): “Kitchen extension 25m² external dimensions, walls: Ibstock red multi brick to match existing, cavity construction with 100mm Kingspan insulation. Roof: Redland concrete tiles to match existing, fully insulated to current regulations. Windows: Aluminium bifold doors, 3m span, Schuco brand, anthracite grey finish, U-value 1.4. Electrics: 8 x double sockets, 4 x USB charging points, downlights throughout, all to 18th edition wiring regulations. Flooring: screed ready for your choice of finish.”
That detail means you know exactly what you’re getting. No surprises, no arguments, no extras.
Our quotes run to multiple pages because we specify everything. This takes longer to prepare but protects both of us from disputes later.
Why Timeline Matters for Cost
Fast, good, cheap: pick two. You can’t have all three.
The Timeline-Cost Relationship:
Budget builders juggle multiple jobs. Your extension takes 16-20 weeks instead of 10-12 weeks because they’re not there every day.
This costs you money through:
- Extended disruption to your life
- Longer period without use of kitchen
- More eating out and convenience costs
- Additional temporary accommodation if needed
- Delayed start on other planned work
On a kitchen extension, the extra 6-10 weeks of disruption costs families £2,000-£4,000 in additional expenses.
Quality builders complete work efficiently because:
- Dedicated team stays on your job until complete
- Proper planning means materials arrive on time
- Experience means fewer mistakes and rework
- Work passes inspections first time
At Rosebrick, we commit to realistic timelines then stick to them. We’re not the fastest builders (those who promise 6-week extensions are usually lying), but we complete work when we say we will.
The Mansfield and Nottinghamshire Difference
Extension costs vary by location. London prices are 20-30% higher than Midlands prices. But local knowledge matters more than regional pricing.
Why Local Experience Adds Value:
We know Mansfield building regulations officers and what they care about. Projects move through approvals faster.
We understand Nottinghamshire ground conditions. Accurate pricing because we know what foundations actually need.
We have relationships with local suppliers. Better prices, priority service, backup options when needed.
We’re established locally. Our reputation matters. We can’t afford to do poor work because everyone knows everyone.
National companies or builders from outside the area don’t have these advantages. They might quote cheaper because they don’t understand local requirements, then face problems and delays that cost you money.
What About the Middle Quote?
Most homeowners pick the middle quote thinking it’s the safe compromise. Sometimes that works, often it doesn’t.
The middle quote is middle for a reason. It’s either:
- Proper builder giving realistic price
- Cheap builder with some things included
- Expensive builder who’s bad at pricing
You can’t tell which without detailed analysis of what’s included.
Better Approach Than Picking Middle:
Compare what each quote includes in detail. Ask specific questions about insurance, warranties, specifications. Check references and previous work quality. Look at trade association memberships. Consider the builder’s experience and track record.
The right builder is rarely the cheapest or the most expensive. It’s the one who delivers quality work, includes everything needed, and stands behind their work long-term.
Red Flags in Cheap Quotes
Warning Signs That Cheap Quote Will Cost More:
- Vague specification without detail
- No mention of insurance or warranties
- “Estimate” not fixed quote
- Doesn’t include building regulations
- No contingency for problems
- Unusually short timeline promises
- Cash-only payment preferred
- No detailed contract offered
- Can’t provide proof of previous work
- Not member of any trade association
If a quote has two or more of these flags, it’ll definitely cost more than quoted and possibly cost you double by the time it’s finished properly.
What Rosebrick Quotes Include (That Others Often Don’t)
Every Rosebrick Quote Contains:
Complete scope of work with detailed specifications. Every material specified by brand and model. All labour costs broken down clearly. Building regulations fees included. Party wall requirements if applicable. Realistic contingency for unexpected issues. Our insurance details and coverage. Warranty information for all work. Fixed-price contract with payment schedule. Clear timeline with key milestones. What’s excluded (so there’s no confusion later).
We spend hours preparing accurate quotes because it protects both of us. You know exactly what you’re paying for. We know exactly what we’re delivering. No arguments, no surprises, no problems.
Why We’re Worth the Extra
Rosebrick quotes are rarely the cheapest you’ll receive. But our clients tell us we’re the best value they’ve found. Here’s why:
Our Work Actually Costs What We Quote:
No hidden extras appearing halfway through. No “unforeseen” problems that should have been obvious. No budget overruns except genuine changes you request. Fixed price means fixed price.
Our Extensions Are Finished Properly:
Pass building regulations first time, every time. Quality materials that last decades. Workmanship we’re proud to put our name to. Extensions that add maximum value to properties.
We Stand Behind Everything We Build:
Comprehensive insurance throughout the project. Long-term warranties on all structural work. Available to address any issues that arise. Reputation we’ve spent 10 years building in this region.
We Deliver When Promised:
Realistic timelines we actually meet. Dedicated teams that stay on your job. Professional project management throughout. Minimal disruption to your daily life.
You Get Expertise You Can Trust:
15+ years experience across hundreds of projects. Local knowledge of Mansfield, Nottinghamshire, South Yorkshire, and Derbyshire. Problem-solving skills that prevent expensive mistakes. Advice that protects your investment.
The Real Cost of Getting It Wrong
Hiring the wrong builder costs more than the price difference between quotes.
Real Cost of Cheap Builder Problems:
Poor work requiring £10,000-£25,000 to fix. Extensions that fail building regulations. Projects abandoned halfway requiring new builder. Legal costs from disputes (£3,000-£8,000 typical). Stress, delays, and disruption that can’t be measured in money. Extensions that reduce property value instead of increasing it.
We’ve been called to quote for fixing failed extensions more times than we can count. The homeowner always wishes they’d hired quality builders from the start. It’s always cheaper to do it right first time.
How to Compare Quotes Properly
When you get multiple quotes, here’s how to compare them fairly:
Ask These Questions About Every Quote:
Is this estimate or fixed-price quote? What exactly is included and excluded? What quality materials are specified? What insurance and warranties apply? What’s the payment schedule? What’s the timeline with key dates? What happens if there are problems? What trade associations are you members of? Can I see examples of previous similar work? Can I speak to recent clients?
Compare answers, not just prices. The quote that answers all questions clearly and honestly is usually the one to trust.
Why Choose Rosebrick for Your Extension
We’re not the cheapest builders in Mansfield, Nottinghamshire, South Yorkshire, or Derbyshire. We’re the builders who deliver what we promise, stand behind our work, and build extensions that last.
Our quotes include everything needed from day one. No hidden extras, no budget surprises, no dodgy tactics. Just honest pricing for quality work.
We’ve been building extensions since 2014. Hundreds of satisfied clients across the region. Established reputation we protect by delivering excellent work every time.
When you hire Rosebrick, you’re paying for:
- Experience and expertise you can’t get from cheap builders
- Quality materials and skilled labour
- Complete insurance and warranty protection
- Professional project management throughout
- Extension completed on time and on budget
- Work that adds maximum value to your property
Yes, we cost more than the cheapest quote. But we deliver better value than anyone else. And we’ll be here in 10 years if you need us, which is more than you can say for many cheap builders who appear and disappear with alarming regularity.
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