Conversion | Basement
Northolt - UB5
Enquiry from: Alex D
Start Date: Immediate
knock down garage build a gran annexe flat
Basement conversions fluctuate in cost depending on project scale, professionals hired and location. If your basement conversion doesnât need any construction work, then it should cost relatively little. However, the majority of projects at least need damp proofing and water proofing work, if not insulation, heating, electrical work and more. This means that even smaller basement conversion projects are still relatively expensive. The average UK cost ranges from £30,000 - £50,000.
Avg. price low | Avg. price low |
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Avg. price | Avg. price |
Avg. price high | Avg. price high |
£46500
£34875
£23250
£11625
£0
Labour cost | £28,000 | |
Material cost | £10,000 | |
Waste removal | £2,000 |
Requests for quotations in Hillingdon in March 2025
Requests for Basement renovation quotations in Hillingdon in March 2025. 0% change from February 2025.
Requests for Basement renovation quotations in London County in March 2025. 0% change from February 2025.
The London Borough of Hillingdon is the westernmost borough in Greater London. It was formed in 1965 from the districts of Hayes and Harlington, Ruislip-Northwood, Uxbridge, and Yiewsley and West Drayton within the historic county of Middlesex. The borough covers an overall area of 44.67 square miles. This makes it the second largest of the 32 London boroughs by area.
Hillingdon Council governs the borough, featuring its headquarters within the Civic Centre in Uxbridge. The south of the borough's former powerful connection with industry has diminished since the 1980s to be replaced by a substantially residential suburban population; the north has remained a consistently residential suburban area.
The borough's residential areas expanded with the extension of the Metropolitan Railway from Harrow on the Hill to Uxbridge during the early 20th century plus the gradual establishment of stops along the line, becoming referred to as 'Metro-land'.
The population increased from 2001 to 2011 by 11.5 per cent, which is 4.4 per cent above the England and Wales mean of 7.1 per cent, making the borough a part of the quickest population-growth area. In this time, the amount of households also increased by 3.3 per cent, with an average of 2.7 inhabitants per household.
The borough maintains more than 200 green spaces, totalling about 1800 acres. As a great deal of the area is within the Metropolitan Green Belt it was, in 2008, among the list of least densely populated of all the London boroughs; open spaces differ in size from the Colne Valley Regional Park to smaller sized gardens which include Lake Farm Country Park. For all your home upgrades, be sure that you use trustworthy experts in Hillingdon to make sure you get the top quality.
Northolt - UB5
Enquiry from: Alex D
Start Date: Immediate
knock down garage build a gran annexe flat
Amersham - HP7
Enquiry from: Russell T
Start Date: Immediate
Work at PwC
Amersham - HP6
Enquiry from: S
Start Date: Immediate
thinking to consider converting the basement into a self-contained studio apartment
Slough - SL2
Enquiry from: S
Start Date: Immediate
Would like to extend the house underground. No Basement right now. So would like to do underground extension below the existing house and back garden.
Beaconsfield - HP9
Enquiry from: Hayder H
Start Date: Immediate
Front garden new basement extension to incorporate a cinema room, swimming pool and gym area (with shower/w.c). Planning application has already been submitted. Decision date 16th May. Planning app...
Windsor - SL4
Enquiry from: Nerissa M
Start Date: Immediate
Homeowner Basement conversion, 200 sqm Please contact to appoint
Windsor - SL4
Enquiry from: Nerissa M
Start Date: Immediate
Homeowner Basement conversion, 200 sqm Please contact to appoint
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If your basement has a cavity drain membrane, it’ll need a pump to move water away from the exterior of your basement and prevent flooding.
Sump pumps can be noisy, but they don’t have to be. Generally, if you have a well-designed pump that’s installed correctly, you shouldn’t find it a problem. For best results, hire a skilled, experienced professional to supply and install your drainage system.
Windows or lightwells can be a great way to introduce natural light into your basement, making it a more valuable, enjoyable space. However, they’re not always an essential requirement.
It’s important for your basement conversion to meet ventilation and fire safety building regulations. Windows can be a good way to do this, but they’re not the only option. Stack or mechanical ventilation, or ensuring that stairs up from your basement connect to an exit can be a good alternative.
So, while windows can be a great asset to your basement conversion, if you can’t afford them or they’re not structurally feasible, you can still create a basement conversion without them.
Whether a basement is worth converting depends on your location and how much work it requires.
A basement conversion can be a great way to add space to your home, and can raise your property value. However, it can also be one of the most expensive ways to do this, so if there’s a possibility to extend your property, or convert a loft or garage, it’s worth considering this first.
You should also compare how much your basement conversion will cost with the amount it could raise your property value by. In some areas, a quality basement conversion could earn you money in the long run, but in others it’ll only cost you. If you’re planning on staying in your property for a long time this might not matter to you, but if it’s not your forever home then it’s an important thing to think about.
In some cases, it’s possible to convert a basement into an apartment. This can be a great way to incorporate an additional dwelling into your property and increase its value. However, converting a basement into an apartment can be quite expensive and time-consuming.
As with any type of dwelling, you’ll need to think about basic things like access, damp proofing, ventilation, insulation, heating, electrics, plumbing, lighting and décor. If you’re planning on extending your basement, then you’ll also need to ensure that your property is sufficiently supported.
It’s a good idea to consult a professional, like a basement conversion building specialist, to find out how feasible your project is before you go ahead with it.
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