About Acorn Basement Conversions
South Yorkshire's trusted specialists in basement conversions, structural waterproofing, and underground construction — delivering quality results since 2008.
Our Story
Acorn Basement Conversions was founded in Sheffield in 2008 with a simple mission: to help homeowners across South Yorkshire unlock the hidden potential beneath their properties. What started as a small team of specialist tradespeople has grown into one of the region's most trusted names in basement conversion and structural waterproofing.
Over the past 15+ years we've completed hundreds of projects — from straightforward cellar conversions in Victorian terraces to complex new basement constructions beneath modern homes. Every project, large or small, receives the same level of care, expertise, and attention to detail that has earned us our reputation.
Why Choose Acorn?
We're not the biggest company in South Yorkshire — but we believe we're the best at what we do. Here's why our customers keep recommending us.
Specialist Expertise
We focus exclusively on basement conversions and structural waterproofing. This specialisation means deeper knowledge, better results, and fewer surprises on site.
Fully Managed Projects
From initial survey through to final decoration, we manage every aspect of your project. One team, one point of contact — no juggling multiple contractors.
10-Year Guarantee
All our waterproofing work is backed by a comprehensive 10-year guarantee, giving you complete peace of mind long after the project is finished.
Transparent Pricing
We provide detailed written quotations with no hidden costs. The price we quote is the price you pay — we believe in complete transparency from day one.
Qualified & Accredited
Our team holds all relevant qualifications and accreditations. We're proud members of Checkatrade and TrustATrader, with verified reviews from real customers.
Local Knowledge
We've worked on hundreds of properties across South Yorkshire and understand the local geology, building stock, and planning requirements better than anyone.
Trusted & Accredited
We're proud to be verified members of Checkatrade and TrustATrader. Every review on our profiles is from a genuine customer — you can read them in full on each platform.
Ready to Start Your Project?
Get in touch today for a free, no-obligation survey and quote. We'd love to hear about your project.