SJ Developments logo Telephone and email icons loft A home extension in progress A row of new build houses A man calling for HIS free quote

As well as designing and constructing the extensions, we provide all the associated building services, from joiners and plasters to plumbers and electricians.  


Having worked with us for several years each one is an expert in their own right.



Expert craftsmen

S.J. Developments is a family run building company specialising in loft conversions and domestic extensions.


With over 20 years of experience in the industry, we pride ourselves on producing work of the highest quality.



Loft conversions & home extensions

Get your free quote today

Guaranteed work

All our workmanship and materials come with a minimum 5 year guarantee, including no charge for future repairs on our work. All our Dormer roofs come with a 10 year guarantee, meaning you can be sure you're paying for something that will last and hold its quality.


As members of the Federation of Master Builders (FMB), you can be sure that we offer a service that you can rely on. You can view our portfolio for examples.