Starting a construction project can be tough. Between finding the time to manage everything, trying to get the design you want while sticking to your budget, and dealing with the noise and mess, it's easy to feel overwhelmed. These hurdles can quickly turn your exciting dream project into a big, stressful headache.

At GS&M Construction, we don't just recognise these concerns - we offer effective solutions. Our mission is to provide a seamless construction experience, addressing these challenges to ensure your journey towards your dream space is smooth, enjoyable, and stress-free.

Why Choose GS&M Construction? Because...
We finish projects on time
We create beautiful spaces
We keep you updated
We have years of experience
Your own project manager
High-quality results

When you choose GS&M Construction, you'll be able to confidently envision your dream spaces and build a successful home improvement project.

Cellar Conversions
Custom Build / Self Build
External and Internal Wall Insulation
Garage Conversions
House Builders
Loft Conversions
Contact us:
We present excellent workmanship nad great value for money. We offer detaild quotes.
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
Garage conversions
Basement/Cellar conversions
Loft conversions
General extension
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