About us:
G S & M Construction is a reliable, conscientious and personable family-run business with a combined experience of over 50 years. We are extremely dedicated with a professional attitude to our work, respecting our customers wishes and working closely with them to achieve the best results. Based in London, we serve all areas of Kent, South London and Croydon.
We offer a first-rate service with good timekeeping and value maintaining good customer relationships as the core of our continued success. We attend regular training to maintain up-to-date trade skills and techniques.
We pride ourselves on the precision and attention to detail in our work, with client requirements central to achieving the desired result. G S & M Construction specialise in bricklaying, extensions, re-pointing, drainage & ground works.
At G S &M Construction, we believe in delivering a high-quality product at a fair price. Covering a wide range of landscape gardening, we can create gardens of all shapes and sizes to suit our customer’s needs. As loft conversion specialists, we pride ourselves in making unused loft space into attractive and functional accommodation to be enjoyed by your family or guests. We uniquely tailor every conversion to meet your specific requirements.
Cellar Conversions
Custom Build / Self Build
External and Internal Wall Insulation
Garage Conversions
House Builders
Loft Conversions
Contact us:
We present excellent workmanship at competitive rates and consider no job as too large or too small. We offer free quotes and estimates and are happy to offer discount for Senior Citizens.
Please contact us today to discuss your requirements or for free friendly, professional and helpful advice. We look forward to hearing from you.
P: 020 3664 9099
E: [email protected]
Click here to visit our website.

Trades offered

Builder general
Basement/Cellar conversions
Loft conversions
General extension
Garage conversions
House Builder
Custom/Self Build
New build

Case studies

Kitchen extension

  • 26 Apr 2020


  • 12 Mar 2020

See more case studies

Customer testimonials

25 Aug 2021

Sean and his team were fantastic. Very easy to work with, explained everything as they progressed and delivered an extension and refurb we are delighted with. Great work! - Philip Mclaughlin


24 Aug 2021

GS&M Construction have totally transformed our driveway and we couldn't be happier with their standard of work and professionalism. We would certainly use them again on any future building works. Thank you to Sean and his team. - Chris Chapman


26 Apr 2020

really happy with the work carried out. Sean and his team was really helpful and offered some great advice whilst working on out house. would recommend to a friend. - pj


28 Jul 2018

I Highly recommend Sean and his team. We was having a rear extension where our old bathroom was which meant we would be without a bathroom for the duration of the build. Gary came up with a great idea of putting a shower room above our stairs in wasted space which meant we didn't have the extra cost of living elsewhere while the work was carried out. really happy with the end product couldn't recommend them enough - cs