Basement Conversion in Merton

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Average Basement renovation cost in Merton

Basement conversions fluctuate in cost depending on project scale, professionals hired and location. If your basement conversion doesn’t 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.

Average price per Basement renovation job in 2026

Avg. price low

Avg. price low
£30,000

Avg. price

Avg. price
£40,000

Avg. price high

Avg. price high
£46,000

£46500

£34875

£23250

£11625

£0

Prices based on actual Basement renovation costs for Merton, as reported by local LeadsDoWork members.

Basement renovation installation cost in Merton 2026

Labour cost £28,000
Material cost £10,000
Waste removal £2,000
Time frame: 1-6 months
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Basement renovation on Google in Merton

Google searches that showed Local Quotes, 17 July to 14 October 2026

5,110

Searches that showed one of our pages for Merton, all services

Source: Google Search Console, the number of times our pages appeared in Google search results. It counts searches that showed the page, not quote requests.

Basement renovation searches near Merton, 17 July to 14 October 2026

214

Searches that showed our page for Fulham

Merton

The London Borough of Merton is a borough in south-west London, England. The borough was formed under the London Government Act 1963 in 1965 by the merger of the Municipal Borough of Mitcham, the Municipal Borough of Wimbledon along with the Merton and Morden Urban District, all formerly inside Surrey. The borough derives its name from the historic parish of Merton, which was centred on the area now generally known as South Wimbledon. The local authority is Merton London Borough Council.

In accordance with population estimates made during 2014, the borough has a permanent population of about 203515 people. Merton is served by a wide array of National Rail stations across the borough, along with the southern tip of the London Underground's Northern line and the District line on the Wimbledon branch. It is the only London Borough which has tube, rail and tram services.

The key industrial centres in Merton are Mitcham, Morden and Wimbledon, of which Wimbledon is the largest. Other smaller centres include Raynes Park, Colliers Wood, South Wimbledon, Wimbledon Park and Pollards Hill. Every year, Wimbledon, one of the four tennis Grand Slam tournaments, is held at the All England Lawn Tennis and Croquet Club in Church Road Wimbledon. The occasion takes place over a fortnight at the end of June and start of July and it is the largest annual sporting occasion to take place in the UK, attracting over 200000 guests for the duration of the Wimbledon fortnight.

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Basement renovation pros in Merton

Nicholas James Construction

7 review(s)
Based: in Bromley, BR1 3AX

From past fifteen years we have been established as the finest building and construction service provider to clients in Bromley and its surrounding areas.

Latest review

Cosima R., SE13
5

Basement Conversion in London

Very friendly and helpful.

Similar Customer Enquiries for Basement renovation in and around Merton

22 Sep

Basement renovation

London - E5

Enquiry from: David G

Start Date: 1 to 3 months

Like full basement works

Property: terrace · When: 1-3 months

Post a similar request >

12 Aug

Basement renovation

Surbiton - KT5

Enquiry from: Luke L

Start Date: Immediate

Addition of a staircase, and make the cellar dry (not damp) so it can be used for storage

Post a similar request >

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FAQs

How to convert a basement into an apartment?

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.

Is a basement conversion worth it?

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.

Are pumps used for basement conversions noisy?

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.

Does a converted basement need windows?

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.

Basement renovation

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Customer Reviews

Overall rating:


Merton Basement renovation pros are rated 4.3 out of 5 on average: 12 rated pros, 66 reviews, of 84 pros covering the area.
The LeadsDoWork rating and review is an overall rating based on verified reviews and feedback from the customers with Basement renovation projects that have been connected with Basement renovation pros to help them. All Basement renovation contractors All Merton Basement renovation contractors

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