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Your Trusted Basement & Loft Conversion Specialists in Manchester
Established with a commitment to excellence, Up & Under has become Manchester's leading specialist in basement and loft conversions. With over four decades of experience, we combine technical expertise with client-focused service, delivering tailored solutions for residential and commercial properties. Our team manages every project from initial survey to completion, ensuring adherence to the highest standards of design, waterproofing, and construction. We prioritise transparency, offering honest assessments even when no work is required, and stand by our 10-year guarantees for added peace of mind.

Utilising environmentally tested materials and cavity drainage systems, we transform underused spaces into functional, energy-efficient areas that enhance property value. Our reputation for reliability, built through thousands of successful projects, reflects our dedication to quality and customer satisfaction.
Services
Basement Conversions Loft Conversions Basement Waterproofing Design Consultations Commercial Conversions
Highlights and features
  • We offer 40+ years of specialist experience in basement and loft conversions.
  • Our projects include 10-year guarantees with insurance-backed protection.
  • We use environmentally tested materials compliant with Health and Safety Executive standards.
  • We provide honest, obligation-free assessments prioritising client needs over sales.
  • We manage all aspects of conversions, from design to completion, minimising costs and delays.
Associations and certifications
  • British Waterproofing Association (BWPDA)
What people say
Fantastic results Very professional Excellent work Great guys to have around Increased property value
Services
Basement Conversions
We convert underused basements into functional spaces like bedrooms, offices, or playrooms. Our process includes waterproofing, structural design, and finishing touches tailored to client needs. Projects adhere to BWPDA standards, ensuring durability and compliance with building regulations.
Loft Conversions
Transforming loft spaces into habitable rooms, we maximise property value without planning permission in many cases. Services include structural reinforcement, insulation, and bespoke design to create bedrooms, offices, or entertainment areas.
Basement Waterproofing
Our cavity drainage membrane systems combat dampness in basements, featuring sump pumps and channels. With 25+ years of success, we guarantee long-term dry environments, critical for habitable conversions or storage solutions.
Design Consultations
We provide full architectural design and specification services for conversions. Our retained architects collaborate on structural, electrical, and plumbing requirements, ensuring seamless project execution from concept to handover.
Commercial Conversions
Tailored conversions for commercial clients, including offices, retail spaces, and storage facilities. We manage large-scale projects with minimal disruption, adhering to strict timelines and budgets while maintaining quality standards.
Questions
What areas do you cover for basement and loft conversions?
We operate across Manchester, Altrincham, Didsbury, Bowden, Stockport, Hale, Chorlton, Sale, and Urmston.
Do I need planning permission for a loft conversion?
Many loft conversions don't require planning permission, but we advise on compliance with building regulations during consultations.
What guarantees do you offer?
All projects include a 10-year guarantee, with optional insurance-backed protection for added security.
How long does a typical basement conversion take?
Projects typically take 8-12 weeks, depending on complexity and client requirements.
Can you convert damp basements?
Yes, our cavity drainage systems and 25+ years of experience ensure effective waterproofing for even the dampest basements.
Do you handle both residential and commercial projects?
Yes, we provide tailored solutions for both home and business clients.
Reviews (4)
Ryan Guest
Jan 24, 2022 Report
This is a retrospective review from 9 years ago to show our appreciation for the professional work and durability of the conversions. Like others we had three quotes and chose Up & Under because of the reasonable price as well as Jamie and his honest can do attitude. He worked through all the options suggesting improvements and multiple recommendations that we hadn't considered. We also visited some previous conversions and were convinced by similarly happy customers. The basement conversion consisted of: underpinning to increase the head height (blessed by an independent surveyor); opening up
Munster Construction
Aug 28, 2021 Report
It OK but up stairs in cafe area is a complete rip of it spoils the place it has a nice relaxing area but the price of some thing to eat and drink is ridiculous
Robert Fenlon
Jan 06, 2021 Report
We invited Up and Under to quote to convert our damp basement into a useable living space. Their quote wasn't the cheapest, nor the most expensive from the quotes but it was certainly the most detailed and comprehensive quote we recieved. The work had a slight delay to its completion and this was due to unforeseen circumstances through an old 'maids tap' which we thought was dry and it turned out it wasn't. The builders of Up and Under where fantastic, working through the very hot summer months, in difficult circumstances digging out the basement by hand. The foreman, Darren, was simply brilliant
Steven Alderdice
Jul 10, 2020 Report
I found Up and Under after a recommendation from a friend of a friend. I received a total of 4 quotes for the conversion of 45m2 Victorian cellar in Stockport from various cellar conversion/structural waterproofing companies including Trace, PRS and BAR preservation. The surveys by them all were basically the same but the quote from Jamie at Up and Under was by far the best price and a no nonsense quote.

This was to do everything including building regs, plumbing and electrics - the Trace quote was over double this. Up and Under used all the insulation, fibreboard and specialist waterproofing membrane