How Much Does a House Extension Cost 2025
A house extension in London is a great option to change your lifestyle and add more value to your place. You might be searching for an extended kitchen, bathroom, bedroom or an extra room. If you plan on building an extension to your home in London, one of the most important things you'll need to do is estimate the cost. By choosing Denham Crescent Ltd's house extension services in London, UK, you will be happy to know that all your house extension cost queries will be answered. House extension is a great alternative to moving from your place while looking for extra space. However, it is necessary to keep the cost in view before starting the actual process of house extension. You should have a budget for all your expected expenditures before considering the house extension in London. It is the foremost step of your house extension because the budget is the primary component that can increase or decrease the cost of your existing property via house extension in London. The following guide will help you remember those factors that can affect your house extension cost in London, UK.
HOW TO ESTIMATE BUILDING COSTS FOR AN EXTENSION
Estimating the house extension budget before surveying the site is too early. The experts consider several factors, i.e.
The House Location
Soil Composition
The Size of the Extension
Type of Extension
Quality of Material
Labour Cost
Condition of the Existing Place
Need of Planning Permission
Finishing Options etc.
However, a rough estimate can be given: £1,500-£2,200 per square metre. You can multiply this value by your house size to get the estimated cost of your extension. For example, a side extension of 20 square metres will cost £30,000-£44,000, plus VAT at 20%.
ADDITIONAL COST FOR HOUSE EXTENSION
Once you get a rough estimate of the place you want to extend. The more specific budget you can get after knowing the accurate price of all factors, i.e., flooring, plumbing, lighting, etc. For example, for a person who needs a side extension of 20 square metres with a budget of £40,000, the key cost might be;
Structure (foundations, walls and roof) £13,333
Plumbing and heating £2,333
Electrics and lighting £2,500
Flooring £1,000
Kitchen units and worktops £9,333
Decorating £1,300
Bifold doors £2,300
Landscaping works/making good £1,400
Denham Crescent Ltd’s team of experts also advise you to keep some extra budget for repairing your existing property, from plumbing and rewiring to adding new siding, doors, or smart appliances to your house, because there must be a symmetry between your old and newly built property. It is suggested that you plan all your actions before starting your house extension, i.e., whether you would like to stay in the house during the extension process or prefer to stay on rent somewhere. Communication is the key that can help you achieve your dream house extension in London if you communicate clearly with your house extension builders about your budget and other extension-related preferences.
SINGLE STOREY EXTENSION COST
The single-storey extension cost in London, UK, depends primarily on your locality and the project size. However, London's average house extension cost can be £1,500-£2,200 per square metre. According to Check A Trade, the average 20 square metre single-storey extension costs around £44,000. Also, the more you pay, the more quality extensions you will get. So, if you want a high-quality finish, you must pay 40% more than the regular finish.
The single-storey extension creates more space for you and saves your energy consumption by connecting your home with the lawn via home extension.
You can consider multiple options as per your family's needs, such as a wide kitchen, a hall for family gatherings, an extra storage place, etc.
DOUBLE STOREY EXTENSION COST
As we discussed above, the cost of a two-storey extension in London, UK, primarily depends on the distance between your house and the builder’s location and the size of your property that has to be extended.
Generally, the two-storey extension costs £2,500-£3,000 per square metre, excluding VAT and finishes.
In London, the property rates are high compared to the overall UK. Similarly, the value added to the existing property by the extension process also increased.
SIDE EXTENSION COST
The average side extension cost in Lonon UK is £3,000-£3,500. However, the exact cost of the side extension can be estimated after knowing the size and location of a house, the quality of material and the chosen finishing options. The side extension in London, UK, is the best option for terraced houses.
CHOOSE DENHAM CRESCENT LTD
If you are looking for a budget-friendly house extension company in London, UK, choose Denham Crescent, Ltd. For over three decades, we have been making our customers happy all over London, UK. We claim to be the best house extension service provider in London. Once you approach us, our professionals will satisfy you with their extensive knowledge and valuable opinions. We would love to hear from you first and provide you with the best-customised house extension services within the given time and budget limit.
Contact us immediately to avail yourself of the best house extension company in London, UK. Call us at 0203 291 1786 or enquiries@denhamcrescent.co.uk to enquire more about the house extension cost and your other queries. Our team of professionals are desperately waiting to respond to you.
FAQ’s
Will an extension add value to my home?
Yes, a house extension can add up to 20% worth to your existing property. So, by extending your house, you upgrade your lifestyle and its resale value.
How Long Does a House Extension Take To Build?
The time required for house extension depends primarily on your property’s size and condition. However, it may take up to 3 to 4 months to extend your house in London, UK.
Do I need planning permission for a house extension?
It is the first thing you should consider before starting your house extension process. Besides this, you also have to pay attention to the party wall act.
What other hidden costs might there be?
There is always a possibility for hidden costs, no matter how precisely you track your expected budget for a house extension, i.e.,
Listed building consent
Survey fees
Building regulations approval fees
Structural engineer fees
Party wall
Insurance
Waste disposal
Electrical upgrades
Council tax
External requirements
