Renovating your home can increase its appeal, improve the way you live and, in some cases, increase its value.
But there is a dangerous assumption homeowners sometimes make:
If I spend £20,000 improving my house, my house will automatically be worth at least £20,000 more.
Unfortunately, property doesn’t work like that.
Some renovations can cost considerably more than the value they add. Others may make your home beautiful for you but do very little for future buyers.
And occasionally, an “upgrade” can actually make a property harder to sell.
If increasing your home’s value is one of your main reasons for renovating, here are 12 renovations that may not be worth the money in the UK — and what you could consider doing instead.
1. An extremely expensive kitchen
Kitchens matter.
That doesn’t mean the most expensive kitchen produces the greatest return.
Imagine spending £30,000–£40,000 installing premium cabinetry, stone worktops and high-end appliances in a relatively modest property.
You may love it.
Future buyers may love it too.
But that doesn’t mean they’ll pay £40,000 more for the house because of it.
There is usually a point where you’re improving the kitchen beyond what buyers expect for properties in that price bracket.
Consider instead
If the existing kitchen is structurally sound, you might achieve much of the visual transformation by:
- Replacing cupboard doors
- Painting suitable cabinets
- Changing handles
- Replacing a tired worktop
- Updating lighting
- Replacing damaged flooring
- Refreshing splashbacks
- Repainting the room
Match the renovation budget to the property — not just your Pinterest board.
2. A luxury bathroom in an average property
The same principle applies to bathrooms.
Beautiful tiles, bespoke cabinetry, premium taps and designer sanitaryware can easily push bathroom renovation costs upwards.
But buyers primarily expect bathrooms to be:
Clean.
Functional.
Well maintained.
Modern enough.
Once you’ve achieved that, spending substantially more may deliver diminishing returns if you’re renovating specifically for resale.
If your current bathroom works perfectly well, replacing silicone, refreshing grout, painting and changing inexpensive fittings may be enough.
3. Removing a bedroom to create a huge master suite
This one deserves careful consideration.
Turning two bedrooms into one enormous bedroom with a dressing room may create your dream home.
But you’ve also potentially changed:
a four-bedroom property into a three-bedroom property.
Bedroom count can influence how buyers search for homes and how properties compare locally.
A family searching specifically for four bedrooms may never even see your newly renovated three-bedroom house in their search results.
That doesn’t automatically mean you should never combine bedrooms.
It means you should investigate the local market before permanently sacrificing one.
4. Converting the garage when buyers actually want parking
Garage conversions can provide useful additional living space.
But they aren’t automatically a value-adding renovation.
Ask:
What do buyers in this particular area value more — another room or secure parking/storage?
This becomes especially important where:
- Street parking is difficult
- Properties have limited driveways
- Garages are commonly used for storage
- Family buyers dominate the market
A well-designed conversion may make perfect sense.
But converting a garage simply because “garage conversions add value” is too simplistic.
5. Overly personalised renovations
Your home should absolutely reflect your personality while you live there.
But if you’re renovating specifically to sell soon, extremely personalised permanent features deserve caution.
Think:
- Highly unusual fitted furniture
- Very bold permanent finishes
- Unusual bathroom suites
- Extremely specific themed rooms
- Elaborate murals
- Highly unconventional kitchen colours
Paint is relatively easy for a buyer to change.
A £15,000 highly personalised fitted installation isn’t.
The closer you are to selling, the more sensible it may be to keep expensive permanent elements broadly appealing.
6. A swimming pool
A swimming pool sounds like the ultimate luxury upgrade.
But in the UK, the financial calculation can be complicated.
A pool can introduce:
- Installation costs
- Heating costs
- Maintenance
- Cleaning
- Safety considerations
- Lost garden space
- Ongoing running costs
Some buyers may see a swimming pool as a fantastic feature.
Others may see it as something expensive they’ll have to maintain.
If you’re considering one because you genuinely want a pool, that’s one decision.
Installing one primarily because you expect it to increase your property’s value is another.
7. Overly expensive landscaping
A beautiful garden can undoubtedly improve a property’s appeal.
But there is a huge difference between:
making a garden attractive
and
spending tens of thousands creating a luxury landscaped garden.
If resale is your priority, buyers may appreciate a tidy lawn, attractive planting, usable patio and good fencing without assigning significant additional value to every expensive landscaping detail.
You can often improve a garden substantially through:
- Weeding
- Lawn maintenance
- Pressure washing
- Painting or repairing fences
- Pruning
- Simple planting
- Creating a usable seating area
You don’t necessarily need to redesign the entire garden.
8. Expensive smart-home technology
Smart lighting.
Automated blinds.
Integrated sound systems.
Advanced security.
Smart heating.
Automated gates.
Some buyers will appreciate them enormously.
Others won’t care.
Technology also ages differently from traditional property improvements.
A beautiful wooden floor may still look beautiful ten years later.
A sophisticated piece of technology installed today may look outdated much sooner.
If you’re adding smart technology because you’ll use and enjoy it, that’s perfectly reasonable.
But don’t automatically assume every pound spent on home automation will return another pound when you sell.
9. Converting too much garden into an extension
Extensions can add extremely useful living space.
But bigger isn’t automatically better.
Suppose you create an enormous kitchen-diner but leave a family house with a tiny garden.
You’ve gained something.
But you’ve also lost something.
For family buyers, usable outdoor space may be an important part of the property’s appeal.
The ideal balance depends on:
- Plot size
- Property size
- Local buyer expectations
- Extension cost
- Planning constraints
- Comparable properties nearby
Before extending, think about the property after the extension rather than only thinking about the extra square metres.
10. Installing expensive finishes throughout
Premium marble.
Designer tiles.
Bespoke joinery.
Luxury flooring.
Custom lighting.
These features can create an incredible home.
But there’s a ceiling to what buyers will pay for a particular property in a particular location.
If similar properties on the street sell within a relatively narrow price range, installing extremely expensive finishes doesn’t automatically allow your home to escape that market.
This is where homeowners can fall into the trap of over-improving.
You’re effectively creating a specification that the local property market may not financially reward.
11. Replacing perfectly good features simply because they’re old
Old doesn’t necessarily mean bad.
Before replacing something, ask:
Is it actually damaged, inefficient or unattractive — or is it simply not new?
Perfectly serviceable:
- Internal doors
- Wooden floors
- Kitchen cabinets
- Bathroom fittings
- Built-in storage
- Period features
may sometimes be restored or refreshed instead.
Repairing, repainting or refinishing can cost dramatically less than replacement.
This is especially important in period properties, where original features may actually contribute to the character buyers value.
12. Renovating immediately before selling without checking local prices
This is perhaps the biggest mistake of all.
Before spending £20,000 preparing a property for sale, determine whether the local market gives you any realistic chance of recovering it.
Suppose your property might currently sell for around £280,000.
Comparable renovated properties nearby sell for around £295,000.
You then spend £25,000 renovating yours.
Even if you achieve £295,000, you’ve spent £25,000 chasing a potential £15,000 increase.
And that’s before considering the disruption, time, financing and possibility of unexpected costs.
This is why renovation decisions should start with numbers rather than inspiration.
The problem of over-improving your home
One of the most important concepts when renovating for value is over-improvement.
Every local property market has limits.
A house isn’t valued solely according to how much you’ve spent inside it.
Its value is also influenced by:
- Location
- Property type
- Size
- Condition
- Bedroom count
- Outdoor space
- Parking
- Local demand
- Comparable sales
You could potentially install a £50,000 kitchen in a £200,000 property.
That doesn’t automatically turn it into a £250,000 property.
The kitchen is still sitting inside the same house, on the same street, in the same local market.
Renovating for yourself vs renovating for resale
These are two completely different decisions.
Renovating for yourself
If you’re staying for ten years and desperately want a beautiful kitchen, the financial return isn’t the only consideration.
You’ll use that kitchen thousands of times.
Your enjoyment has value too.
Renovating for resale
Now the calculation changes.
You need to ask:
Will buyers realistically pay enough extra to justify what I’m about to spend?
That’s a much stricter test.
Something can therefore be a fantastic lifestyle renovation while being a poor investment.
How to know whether a renovation is worth it
Before starting an expensive project, do some basic research.
Step 1: Estimate your property’s current value
Look at genuinely comparable recently sold properties — not simply asking prices.
Step 2: Find renovated comparable properties
How much more are buyers actually paying for homes that already have the improvement you’re considering?
Step 3: Calculate the complete project cost
Don’t only include the builder’s initial quote.
Consider:
- Materials
- Labour
- Professional fees
- Planning costs where applicable
- Building control where applicable
- Waste removal
- Decorating
- Finishing
- Contingency
Step 4: Compare the numbers
If the potential increase in value is smaller than the project cost, it probably isn’t a particularly compelling renovation from a purely investment perspective.
The £20,000 renovation question
Before spending £20,000 on your home, ask yourself:
Would I still want to do this if it added only £5,000 to the property’s eventual selling price?
If the answer is yes because you’ll enjoy the improvement for years, that may still be a perfectly reasonable decision.
If the answer is no because you’re doing it solely to make money when you sell…
You probably need to investigate the numbers more carefully.
What renovations are usually safer before selling?
Rather than undertaking a major transformation immediately before listing, start with the condition of the existing property.
Priorities may include:
- Fixing genuine defects
- Repairing visible damage
- Fresh decoration
- Deep cleaning
- Improving kerb appeal
- Tidying the garden
- Repairing damaged flooring
- Improving lighting
- Refreshing kitchens and bathrooms
- Decluttering
These projects tend to require substantially less capital than major structural renovation.
Internal link here: Cheapest Ways to Increase Property Value
That article is the perfect companion to this one.
Should you install a new kitchen before selling?
Not necessarily.
If the existing kitchen is extremely poor, improving it may make the property more attractive.
But if it’s functional and simply a little dated, spending tens of thousands immediately before selling could be unnecessary.
Consider whether a cosmetic refresh could achieve enough improvement for substantially less.
Is an extension worth the money?
It can be.
Extensions can provide valuable additional living space, but the financial result depends on both construction cost and the additional value buyers place on that space.
A £60,000 extension that adds £30,000 to the eventual sale price may be worthwhile to a family who enjoys the space for 15 years.
It looks much less attractive as a project undertaken solely to sell six months later.
Is a loft conversion worth it?
Potentially, particularly when it creates genuinely useful additional accommodation.
But don’t assume profitability.
Consider:
Conversion cost
Ceiling height
Staircase placement
Lost space elsewhere
Whether it creates a practical bedroom
Local property values
Building regulations
Planning requirements where applicable
And critically, compare your home with similar properties locally that already have loft conversions.
Should you convert a garage?
Again, it depends.
A garage conversion could provide a bedroom, office, playroom or additional living area.
But removing parking or valuable storage may be undesirable in some locations.
Look at what buyers locally prioritise before deciding.
Can renovations decrease property value?
Potentially.
A renovation could make a property less attractive to some buyers if it removes something they value.
Examples could include:
Reducing bedroom count
Removing valuable parking
Eliminating too much garden
Removing desirable original features
Creating an awkward layout
Installing extremely personalised permanent features
The amount spent doesn’t determine whether something is an improvement.
The finished property does.
What should I renovate first?
If your goal is property value rather than purely personal enjoyment, consider this order:
1. Serious defects
Roof problems, leaks, structural concerns, unsafe systems and significant damp need appropriate professional investigation.
2. Maintenance
Fix damaged doors, taps, sealant, flooring and other obvious problems.
3. Presentation
Clean, declutter and decorate.
4. Functionality
Improve storage, lighting and awkward spaces.
5. Major renovation
Only after the previous stages should you consider whether expensive kitchens, bathrooms, conversions or extensions make financial sense.
Frequently Asked Questions
What home improvements don’t add much value?
Highly personalised upgrades, extremely expensive finishes and improvements that exceed local buyer expectations may fail to recover their full cost. The result varies considerably by property and location.
Can you spend too much renovating a house?
Yes. Over-improvement occurs when the cost and specification of improvements exceed what the local property market is likely to reward.
Is it worth renovating before selling?
Sometimes, but major renovation isn’t automatically necessary. Compare the property’s likely value before and after the work with the complete renovation cost.
Is a new kitchen worth it before selling?
It depends on the existing kitchen and local market. A cosmetic refresh may sometimes offer a more economical alternative to complete replacement.
What should I avoid renovating before selling?
Be cautious about expensive, highly personalised or structural changes unless local comparable sales suggest buyers are likely to value them.
Does spending £10,000 on a house add £10,000 to its value?
Not necessarily. Renovation cost and additional market value are two separate numbers.
Final Thoughts
The best renovation isn’t always the biggest one.
And the most expensive improvement isn’t necessarily the one that adds the most value.
If you’re improving your forever home, enjoyment, comfort and personal taste deserve to be part of the decision.
But if your primary objective is financial return, every major project deserves a much colder calculation:
What will it cost?
What will the house realistically be worth afterwards?
What am I sacrificing to create it?
Sometimes the smartest renovation is a £30,000 extension.
Sometimes it’s a £3,000 kitchen refresh.
And sometimes the smartest financial decision is not renovating at all.
Planning a Home Improvement Project?
Whether you need a builder, painter, kitchen fitter, bathroom installer, electrician, plumber or other local tradesperson, The Right Guy can help you find professionals for your next home improvement project.
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