Basement Conversion in Islington

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Average Basement renovation cost in Islington

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 Islington, as reported by local LeadsDoWork members.

Basement renovation installation cost in Islington 2026

Labour cost £28,000
Material cost £10,000
Waste removal £2,000
Time frame: 1-6 months
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Islington

The London Borough of Islington is a London borough in Inner London. It was established in 1965 by merging the previous metropolitan boroughs of Islington and Finsbury, however the merged entity remains the second smallest borough in London and also the third smallest district in England. It covers a total area of 5.74 square miles. The borough consists of two Westminster parliamentary constituencies, Islington North and Islington South & Finsbury.

The 2011 Census indicated that Islington contains the highest population density of local authorities in England and Wales, with 13875 people per square kilometre. According to population estimates collected part way through 2014, Islington has a permanent population of about 221030 people. The borough is served by a wide selection of transportation services, with direct connections to the suburbs plus the City and West End. In 2011, the main forms of transports that residents used were the underground, metro, light rail and tram, which were employed by 19.4 per cent of all residents. Another 10.3 per cent used the bus, as well as 10.3 per cent being the figure for people who would walk.

The borough is recognised as the home to football club Arsenal, one of the most successful clubs in England and Emirates Stadium, which is one of the largest football stadiums in Britain. Other notable attractions include the London Canal Museum and the King's Head Theatre.

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Basement renovation pros in Islington

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 Islington

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 >

08 Jul

Basement renovation

Bushey - WD23

Enquiry from: Guy W

Start Date: Less than one month

Excavation of a two-room (30 sq. m) under garden basement with lightwells in one of the rooms and reconstruction of patio above. single storey extension of rear of property 1-2m back to enable interna

Property: terrace · When: less than one

Post a similar request >

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FAQs

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.

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.

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.

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.

Basement renovation

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Customer Reviews

Overall rating:


Islington Basement renovation pros are rated 4.5 out of 5 on average: 13 rated pros, 66 reviews, of 82 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 Islington Basement renovation contractors

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