Transform Your Home with Expert Basement Conversions

Specialists in all aspects of basement conversions, structural waterproofing, underpinning, and design & build.

We offer detailed surveys and reports for homeowners across South Yorkshire.

Proud Members of the Basement Waterproofing Association

Finished basement conversion — modern living space

About Acorn

At Acorn Basement Conversions, we are dedicated to helping our customers unlock the hidden potential beneath their homes across Sheffield, Rotherham, Barnsley, Doncaster, Worksop, Dearne Valley, and the surrounding areas. As specialists in basement conversions, structural waterproofing, underpinning, and design & build, we provide comprehensive solutions to create beautiful, functional living spaces.

Our small, family-run company prides itself on delivering high-quality service using the latest techniques and solutions in the industry. We understand the importance of trust and reliability when it comes to transforming your property. That's why we are committed to providing exceptional service that meets the highest standards of quality and professionalism.

With years of experience and a dedicated team of experts, you will always experience the highest level of customer satisfaction. We use the latest systems and proven methods to ensure lasting results. As sister company to Acorn Damp Proofing, our expertise is backed by industry-leading standards. We provide a 10-year guarantee on all our waterproofing treatments.

Basement Conversions

Full basement conversions · Cellar conversions · New living space creation

Structural Waterproofing

Tanking · Cavity drain membranes · Sump & pump systems · Structural waterproofing

Design & Build

Full project management · Architectural design · Planning applications · Interior fit-out

Call Acorn Basement Conversions in South Yorkshire on

0330 043 2939

Products We Use

We only use industry-leading materials to ensure lasting results. Our trusted partner Remmers provides the specialist waterproofing systems we rely on for every project.

Acorn operative applying Remmers waterproofing product on site

Remmers is a world-leading manufacturer of specialist construction chemicals, waterproofing systems, and surface protection products. By using Remmers systems on every project, we can back our work with a comprehensive 10-year guarantee.

What Our Customers Say

A very professional job done from start to finish. From the initial survey to the final fit-out, the team were helpful, friendly and knowledgeable. The basement has been completely transformed into a fantastic living space. I will definitely recommend this company to anyone looking for a basement conversion.

David Hartley

Used Acorn Basement Conversions after being recommended by a neighbour, glad I did as they did an excellent job. I had a dark, damp cellar which has been converted into a beautiful home office. No mess left after the work, the finish was better than I expected and no signs of any damp issues. Would recommend to anyone.

Sarah Mitchell

Excellent job, very professional. Explained exactly what would be done, cleaned up and left the room in the same condition as it was before work was started. The basement conversion has added real value to our home. Would definitely recommend this company.

Checkatrade Review