How Much Should You Budget for a Home Renovation in London? (2026 Guide)
- regalltd
- 5 days ago
- 6 min read
If you're thinking about renovating your home, one of the first questions you'll probably ask is:
"How much is this actually going to cost?"
Whether you're planning a new kitchen, a house extension, a loft conversion or a full property renovation, understanding the likely costs upfront can help you avoid unnecessary stress, costly surprises and budget overruns later on.
As a London-based renovation company with more than 15 years of experience and over 120 completed projects, we've seen firsthand how proper planning can make the difference between a smooth, enjoyable renovation and one that becomes more expensive than expected.
The challenge is that no two projects are the same. The size of your property, the level of finish, structural requirements, planning considerations and even access to the site can all influence the final cost.
That's why we've created this guide.
We'll walk you through typical renovation costs in London, the hidden expenses many homeowners overlook, how much contingency you should allow, and practical ways to keep your project on budget from start to finish.
If you're currently planning a renovation, this guide will help you budget with confidence and make informed decisions before work begins.
Quick Renovation Budget Checklist
Before starting your renovation, make sure you've budgeted for:
✓ Construction costs
✓ Materials and finishes
✓ Design and planning fees
✓ Building Control costs
✓ Contingency fund (10–20%)
✓ Temporary accommodation (if required)
✓ Furniture and final styling
Don't worry if you're unsure where to start—our team can help you build a realistic renovation budget during your free consultation.
Start With Your End Goal
Before looking at numbers, take a step back and think about what you're trying to achieve.
Are you looking for more space for a growing family?
Do you want to modernise an outdated property?
Are you trying to increase the value of your home?
Or are you simply tired of living around problems that have been on your to-do list for years?
Having a clear goal makes budgeting much easier because it helps separate the things you genuinely need from the things that would simply be nice to have.
At Regal Construction Services, we've worked with homeowners who initially planned a full property refurbishment, only to discover that a carefully designed extension or loft conversion would better meet their needs while delivering a stronger return on investment.
How Much Does a Renovation Cost in London?
This is where most people head straight to Google.
The challenge is that online estimates can be wildly different depending on the source.
As a general guide, homeowners in London can expect:
Kitchen Renovations
Typically between £15,000 and £40,000+
The biggest cost differences usually come down to cabinetry, worktops, appliances and the level of finish.
Bathroom Renovations
Typically between £8,000 and £25,000+
Factors such as premium tiles, bespoke joinery and plumbing alterations can have a significant impact on costs.
Loft Conversions
Typically between £45,000 and £85,000+
The type of conversion, structural requirements and whether you're adding an en-suite all influence the budget.
House Extensions
Typically between £60,000 and £150,000+
Extensions often involve groundwork, structural steelwork, roofing, glazing and significant finishing works, which is why costs can vary considerably.
Full House Renovations
Typically between £80,000 and £300,000+
The condition of the property, the size of the home and the level of specification will largely determine where your project sits within that range.
It's important to remember that these figures are indicative only. Every project we undertake at Regal Construction Services is individually assessed to provide homeowners with a detailed and transparent quotation based on their specific property and requirements.
The Costs Most Homeowners Forget About
One of the biggest causes of budget overruns isn't overspending.
It's simply forgetting to budget for everything.
Most people remember the exciting things—new kitchens, beautiful bathrooms, flooring and decorating.
What often gets overlooked are the costs behind the scenes are things like:
Architectural drawings
Structural engineer calculations
Planning applications
Building Control fees
Temporary works
Waste removal
Upgrading old electrics
Plumbing improvements
Contingency costs
None of these are particularly glamorous, but they're often essential to delivering a successful project.
As a fully managed construction company, we help clients identify these costs early in the planning process so there are fewer surprises once work begins.
Why We Always Recommend a Contingency Budget
If there's one piece of advice we'd give every homeowner, it's this:
Leave room for the unexpected. Especially in London's older housing stock.
Until walls are opened up and floors are lifted, it's impossible to know everything hidden beneath the surface.
Over the years we've uncovered:
Old wiring that no longer meets regulations
Hidden water damage
Structural defects
Damp issues
Previous poor-quality workmanship
That doesn't mean you should expect problems.
It simply means you should be prepared if they arise.
As a rule of thumb:
Set aside around 10% for newer properties
Set aside 15–20% for older homes
If you don't need it, great. If you do, you'll be very glad it's there.
Many of the Victorian and Edwardian properties we renovate across London contain hidden issues that only become visible once work is underway, which is why contingency planning is such an important part of our budgeting advice.
Don't Choose a Builder Based on Price Alone
It's natural to compare quotes. In fact, we encourage it.
But it's important to compare what's actually included, as cheaper quote isn't always cheaper. Sometimes it's simply missing items that will appear later as variations and additional costs.
When reviewing quotations, ask:
Is project management included?
Are all labour costs included?
Have waste removal and skips been allowed for?
Are materials clearly specified?
Is there a realistic timeline?
Is there a workmanship warranty?
A detailed, transparent quotation usually tells you far more about a company than the final number at the bottom of the page.
At Regal Construction Services, we believe homeowners should understand exactly what they're paying for before work begins. Clear communication and transparent pricing help build trust and reduce the likelihood of unexpected costs later in the project.
Good Planning Saves Money
One of the easiest ways to keep costs under control is to make decisions early.
Changing your mind halfway through a renovation isn't unusual—but it can become expensive.
The more decisions that are finalised before work begins, the smoother the project tends to run.
That includes:
Layouts
Kitchens
Bathrooms
Flooring
Lighting
Finishes
Paint colours
Good planning doesn't just save money. It saves time, stress and uncertainty.
This is one reason why our team works closely with homeowners during the planning phase, helping them make informed decisions before construction starts.
Why Many London Homeowners Choose a Fully Managed Renovation
For most people, a renovation isn't something they do often.
Managing builders, plumbers, electricians, suppliers, deliveries and schedules alongside work and family life can quickly become overwhelming.
That's why many homeowners prefer a fully managed approach. Instead of coordinating multiple contractors yourself, you have one experienced team overseeing the entire project—from planning and design through to completion.
At Regal Construction Services, our fully managed renovation service provides a single point of contact throughout the project, ensuring every stage is carefully coordinated and delivered to a high standard.
It means fewer moving parts, clearer communication and far less stress throughout the process.
Need Help Budgeting Your Renovation?
We offer free consultations for homeowners across London. We'll discuss likely costs, timelines and the most practical approach for your property.
Frequently Asked Questions
How much should I budget for a house renovation in London?
The answer depends on the size of your property, the level of finish and the amount of structural work required. As a general guide, full house renovations in London typically start from around £80,000 and can exceed £300,000 for larger or high-specification projects.
What is the biggest hidden cost during a renovation?
Unexpected structural issues, outdated electrics and plumbing upgrades are among the most common hidden costs. This is why we recommend including a contingency budget from the outset.
Is it cheaper to renovate or move house?
For many homeowners, renovating can be more cost-effective than moving once stamp duty, legal fees, moving costs and property prices are taken into account. It also allows you to create a home tailored to your lifestyle.
How much contingency should I allow?
We typically recommend setting aside 10% for newer properties and 15–20% for older homes where hidden issues are more likely.
Can I renovate in stages?
Yes. Many homeowners choose to phase larger projects over time. A renovation specialist can help prioritise works and create a realistic plan that aligns with your budget.
Thinking About Renovating?
Whether you're planning a kitchen renovation, bathroom renovation, extension, loft conversion or full property refurbishment, creating a realistic budget is one of the most important steps you can take.
At Regal Construction Services, we've helped homeowners across London plan and deliver successful renovations for more than 15 years.
Our experienced team understands the challenges that come with renovating London properties and can provide practical guidance on costs, timelines, planning requirements and construction options tailored to your home.
If you'd like expert guidance on likely costs, timelines and the best approach for your property, we'd be happy to help.
Book a Free Consultation today and start your renovation with confidence.
Or see some of our past projects here.
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