Scores based on 12 reviews

Reliability & timekeeping

Invoice history based on 8 reviews.

Invoice History
Charged as per quote / estimate100%
Appointments reported as missed (6 months) 0
Average score 10.00
12 reviews
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Keystone have been designing and building for over 10 years. Our aim has always been to challenge the stereotyped perception of general building contractors.

We do this though skilled management of projects, inspiring ideas, cutting edge thinking and developing collaborative relationships with customers and suppliers.

We have built a diverse team with complementary skills whose shared passion is to design and build living environments that maximise light and space.

Extensions, Refurbishments & Loft Conversions in Sussex, Surrey & Kent

At Keystone our mission is to help our clients imagine, design and build environments that enhance their everyday routines and create a sense of joy in the place they live. Discover our full range of services below from small refurbishments to complete property renovations.


A home extension will not only give you the extra space you are looking for, it will also alter the dynamics of the home. Creating an opportunity to reorganise existing rooms to improve the flow and function of all your living spaces.


A home refurbishment is an opportunity to tap into the full potential of your living environment by enabling the best possible use of space. Our design team will help you create bold upgrades and stylish remodelling to meet your changing needs.

Loft Conversions

Take advantage of the potential in your roof space by opening it up to a world of light and space. Clever and innovative loft conversions create a whole new canvas for you to rest, work or play

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Based in

Haywards Heath, West Sussex

Works in

Sussex, Surrey, Kent, Haywards Heath, Hassocks, Lindfield, Brighton, Shoreham, Worthing, Chichester, Horsham, Crawley, Redhill, Sevenoaks, Tunbridge Wells, Eastbourne, Lewes, Uckfield, East Grinstead