J3 Advisory Structural Warranty

Building Warranties for Conversions & Refurbishments

Conversion Building Warranties

Building warranties for conversion and refurbishments are important to protect against defects that may occur within the structure of a newly converted project.

Major structural faults can often be costly to put right, which is why it is vitally important to seek the right advice and obtain the most appropriate insurance. Where a property is being converted for residential use, a conversion warranty is required to satisfy mortgage lenders, who will also insist that a recognised and reputable policy is in place for each newly built property.

For example, if you built a block of flats a few years ago and now wish to sell, the new purchasers’ mortgage lender will require that a suitable structural warranty is in place. Alternatively, if you wish to refinance your existing loan with another provider, the new lender will also require that a warranty be in place.

J3 Advisory is trusted by developers across the UK to source and advise on the most appropriate policies for their clients’ developments. If you wish to speak to an advisor, call us on 020 3096 0718 or fill in our enquiry form online.

The benefits of our Conversion Warranty:

  • 10-year cover from the date of practical completion
  • Accepted by high street banks
  • First party insurance
  • Backed by A-rated underwriters

Why choose J3 Advisory for conversion warranties?


A-rated insurers

All of our policies are underwritten by A-rated insurers, providing our clients total peace of mind.


Approved by all major lenders

The leading banks and building societies widely accept our conversion building warranty, helping potential buyers obtain the mortgage they need to purchase a home.


Full market comparison

We scour the market to find the most suitable building warranty for each project.

Other Residential Building Warranty Solutions

New Build Warranty

Conversion Warranty

Latent Defects

Retrospective Warranty

Social Housing Warranty

Have a project you wish to discuss?