Basement Conversions

Basement Conversions in Sheffield

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Our Approach

Create High-Quality Living Space Below Ground

A basement conversion allows you to add valuable living space without changing the footprint of your home. From cinemas and gyms to bedrooms, offices, and self-contained living areas, a well-built basement can completely transform how your property works.

We deliver basement conversions in Sheffield as part of our wider conversions and residential building services. We stand out from the crowd through our build quality, structural expertise, and full end-to-end delivery.

With 70 years in the construction industry, we have the experience to manage complex groundwork, structural alterations, and waterproofing – all handled by one trusted team.

Unlock Space Without Extending or Moving

Basement conversions make use of existing foundations and unused space beneath your home.

Built for Long-Term Durability

We prioritise structure, drainage, ventilation, and waterproofing for safe, compliant results.

Designed to Suit Modern Living

Every basement conversion is tailored to your lifestyle, layout, and property type.

What We Deliver

Basement Conversion Services in Sheffield

Basement projects require careful planning, experienced builders, and a focus on quality at every stage. Our team manages all aspects of the build, integrating basement work seamlessly with wider renovations or property upgrades where required.

Full Basement Conversions

Transform existing basements into habitable living spaces.

Structural Alterations

Underpinning, strengthening works, and layout changes.

Waterproofing & Damp Control

Installed to current building regulations.

WHY US?

Why Choose Us for Basement Conversions in Sheffield?

Quality-Driven Construction

We are builders first and foremost. Every basement conversion is delivered with a focus on structural integrity, finish, and long-term performance.

Complete End-to-End Service

From initial assessment through to completion, all work is managed in-house, alongside related extensions or refurbishments where required.

Experience You Can Trust

With 10,000+ projects completed and 1,000s of happy customers, our reputation is built on consistent results.

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OUR PROCESS

How to Get Started

We believe your basement conversion journey should be as simple as possible, structured, and stress-free. Here’s how it works:

1. Contact Us

Tell us about your basement conversion ideas and arrange a free consultation.

2. Site Visit & Quotation

We assess your designs, discuss options, and provide a fixed-price quote – no surprises.

3. Plan & Design

We finalise layouts, manage building regulations, and prepare the project for construction.

4. Build Begins

Our experienced builders complete the conversion efficiently, safely, and with minimal disruption.

Get Started

1,000's

of happy customers

10,000+

jobs completed

70 years

in the industry

Google

Nick Nelson Piercy

5 stars

The work undertaken by Jenkinson Construction has been first rate. From Richard coming round to estimate the job to Ian and his team getting on with it - I cannot find fault. They worked tirelessly, cut no corners, explained every step they were taking and involved me in every decision. Minor adjustments were gladly absorbed. They were on the job virtually every day. This was the first sauna and shower room they had built and installed, but they went about it with consummate skill and expertise. The result is better than I had ever imagined. All to budget and above board. I can recommend 100%.

Google

Adam Hulley

5 stars

Jenkinsons completed an attic extension project for us in 2025. From tender to completion the level of detail and communication was always good from Richard, Nathan and Martin. Minor changes and additions (at our request) were managed professionally and with no surprises. Nothing was a problem and all works were completed to a high standard. Big thank you to the whole team who worked on the project. Wouldn't hesitate to use Jenkinsons again in the future

Google

Nel

5 stars

Jenkinson’s did a complete house renovation for me and did an absolutely awesome job. Fantastic team who went over and above. Massive thanks to Ian who project managed everything to make everything come together seamlessly and went above and beyond to get all my requests completed, Lee who managed to make old walls covered in coral anaglypta wallpaper look like newly plastered perfectly painted walls (and was my secret interior designer) and Luke who did a fantastic job with all the joinery. Will definitely use again and would highly recommend.

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Basement Conversion FAQs

Do Basement Conversions Need Planning Permission?

Most basement conversions do not require planning permission, but building regulations approval is essential. This is usually submitted once the planning drawings are complete, and your architect will be able to advise on approvals during the design phase of your project.

How Do You Deal With Damp & Waterproofing?

We install compliant waterproofing systems designed for long-term protection and durability, ensuring comfort and longevity for your conversion.

Can You Work on Older or Period Properties?

Absolutely! Being based in Sheffield, we regularly carry out basement and structural works in older or listed Sheffield homes.

How Long Does a Basement Conversion Take?

Timeframes vary depending on complexity, but most projects take around 4-6 weeks following preparation.

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Ready to build something great?

Tell us about your project and we’ll show you how we can bring it to life.

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