Is a Loft Conversion Cheaper Than Moving House?
If your house is getting too small for you, there are two common choices people in the UK face; either a loft conversion or moving to a bigger place. Although each choice will fix the problem of lack of space, these choices differ greatly when it comes to their cost. This article considers the costs of both so that you could make an informed decision rather than act purely on intuition.
As a quick summary, a loft conversion costs less than moving to a new place in a variety of situations. This becomes even more evident after you take into account the costs associated with selling your current home and purchasing a new one.
The Real Cost of Moving House in the UK
Most individuals only see the difference in prices of their present house compared to the bigger house they hope to purchase. It is not all that goes into it and there are additional costs associated with selling and purchasing a new property.
Here is what moving house can cost in the UK in 2026:
Stamp Duty Land Tax
Stamp Duty is among the largest additional expenses when you are considering moving to a new house. Stamp duty is also among the most overlooked expenses while doing your budget calculations. The cost of stamp duty will be £10,000 for a property worth £400,000, and for a property worth £500,000 it will be £12,500. For second homes and investments, the rates are even higher. First time buyers are given some relief up to £425,000 but no relief for existing homeowners.
Estate Agent Fees
The sale of the existing property may require you to pay around 1% to 3% of the sale price as commission fees to an estate agent. On a property worth £350,000, the figures would be in the range of £3,500 to £10,500. It would depend on the type of agent you go for.
Conveyancing and Legal Fees
You require the services of a solicitor to sell your existing property and buy your new one. Legal costs associated with a typical transaction will amount to somewhere between £2,000 and £4,000.
Surveyor Fees
The mortgage company will usually request an assessment of the house you wish to buy. There might be a need for an overall structural survey before you purchase the property. This is very advisable in many cases and costs from £500 to £1,500.
Removal Costs
Moving all your belongings can add another £800 to £2,500 to the cost. A professional removal company will charge based on how much you have and how far you are moving.
Mortgage Arrangement Fees
Arrangement fees associated with many mortgages can range from £500 to £2,000. There could be an early repayment fee on the other hand for leaving the fixed rate mortgage earlier than what is agreed upon initially. The amount of money involved in this case could be several thousands of pounds.
The Emotional and Practical Costs
There are also some expenses that cannot be shown in a spreadsheet. You will have to move out of your current neighborhood and switch your kids from their school. Also, you will need to get adjusted to a totally new environment. It is hard to assign money value to these, but these factors may influence your choice in a huge way.
Total cost of moving: £20,000 to £35,000 or more on top of the difference in purchase price.
What a Loft Conversion Actually Costs
Loft conversions in 2026 in the UK cost about £22,000 at the low end of the scale for a simple Velux loft conversion and up to £95,000 for an entire mansard loft conversion. The most popular loft conversion is the rear dormer loft conversion and the average cost for this type ranges from about £45,000 to £65,000 across the UK. The cost in London and the South East may be 20% to 30% higher.
To find out more about loft conversion costs, including our free loft conversion cost calculator, see our full guide to loft conversion costs.
Side by Side Comparison
Let us take an example and use actual numbers. There is a family who resides in a semi-detached home that has three bedrooms and the value of this home is around £350,000. They wish to add a fourth bedroom so they have two main options.
Option 1: Move to a four-bedroom property at £450,000
| Cost | Amount |
|---|---|
| Stamp duty on £450,000 | £10,000 |
| Estate agent fees on sale | £5,250 |
| Legal fees both sides | £3,000 |
| Survey on new property | £800 |
| Removal costs | £1,500 |
| Mortgage arrangement fee | £1,000 |
| Total moving costs | £21,550 |
| Plus the £100,000 difference in purchase price | £100,000 |
| Total financial impact | £121,550 |
Option 2: Dormer loft conversion creating a fourth bedroom with en-suite
| Cost | Amount |
|---|---|
| Dormer loft conversion | £55,000 |
| En-suite bathroom | £10,000 |
| Contingency 10% | £6,500 |
| Total cost | £71,500 |
In this example, the cost of loft conversion is around £50,000 lower than moving to a new house. The difference becomes even more interesting when you consider the value the conversion could add to the property.
Does a Loft Conversion Add Value?
Absolutely, the increase in value to your home can be quite substantial. In a research conducted by Nationwide Building Society, it was found that an addition of a double bedroom and a bathroom through a loft conversion can add up to 21% in value to your property. This would mean a potential increase in value worth £73,500 on a £350,000 property.
Practically speaking, a £55,000 dormer loft conversion can add a potential increase in the value of your property worth £70,000 to £80,000. You do not only have the extra bedroom and living space that you wanted but you do not need to move and buy another home. Of course, these figures are just guides and would still depend on your property and market situation.
However, moving house is a completely different story. You are not adding value to your existing property. Instead, you are simply selling the existing one and buying another one.
When Moving House Makes More Sense
A loft conversion is not something that suits everybody. In certain circumstances, moving to a new house makes more sense both practically and financially.
If your home does not have the correct dimensions or even the correct location, having more room will not help you. You can get an extra bedroom with a loft conversion but if you require 3 extra bedrooms or wish to relocate to another location, moving becomes the better choice.
Your loft may also not be suitable for conversion because of low head height, a flat roof pitch, or a complex roof construction, all of which will increase the expense of conversion and may end up being not worth it at all. A free survey conducted by an expert will help you make sure that your loft is indeed suitable.
If you already have a large property, moving may appear much more attractive due to the fact that there will be no substantial difference between the expense of moving and the stamp duty in relation to the price of the house that you will buy.
The Bottom Line
For most homeowners in the UK, a loft conversion will be much more economical than moving to a new home. Depending on the type of conversion and its specification, the conversion can cost you between £22,000 and £95,000 whereas moving house would cost you between £20,000 and £35,000 in additional transaction costs alone. You will then need to consider the higher buying price of the new house.
Loft conversion can also increase the value of your property. Instead of spending money on things like estate agents, solicitors and stamp duty, you are increasing the living area of the house that you currently have.
The first practical thing that you can do is seek a free survey from an expert who is experienced in doing loft conversions. This way, you will know whether your loft is suitable for conversion and what type of conversion could suit your needs. When you have a quote, you will be able to compare it to the overall cost of moving.
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