We are driven by a passion for the bespoke restoration of London’s finest architectural homes.

GBG Building Services Ltd was established in 2005
by Mariusz Gawecki, with his father Eric.
During the past eighteen years of growth and building partnerships, we’ve gained experience in prime property construction and refurbishment, delivering projects for our clients across London.  Our team brings its technical and project management expertise, as well as exemplary craftsmanship
to every building project
, helping our clients’ designs come to life.
The team consists of engineers and project managers, as well as long-standing craftsmen, who have over 30 years of experience with various finishes from marble to wood, glass and metal.

Cadogan Square grade listed victoria building - luxury maisonette refurbishment

Our Mission

We want to show you
that there is a better way
to renovate your home

Reliability in construction is not an impossible goal. Delivering well-managed renovation projects with clean sites and efficient communication at all levels, within an agreed time frame, is what we excel at. We analyse site complexities, potential risks and delays, and the requisite specialist skills to advise on buildability early on during pre-construction meetings, then adapt quickly to ever-changing build environments to keep additional costs at a minimum. We provide honest and realistic pricing based on over 30 years of on-site experience.

This is the method of work that we have chosen. Will you join us?


About us


Mariusz Gawecki BSc

Mariusz is the Founder and Director of GBG Building Services Ltd. His key role is building relationships and meeting new clients, as well as general company management. He is a qualified Construction Project Manager with over 15 years of hands-on experience. This gives him an invaluable advantage of how to run difficult projects smoothly through to completion. He is an extremely passionate and results-driven professional who has built a great team around him. He is a proud father of daughter Hannah, as well as a foodie and sushi lover, a keen skier and photographer.

portrait of Mariusz Gawecki, Director of GBG building Services Ltd closeup

Eric Gawecki

Eric is an established site manager with over 30 years of experience working on prime properties in the most affluent areas of London. Eric’s main duties are running sites and leading other site managers within the company.nHis specialties are: interior fit-outs & refurbishments, antique furniture restoration, and electromechanics. He enjoys spending free time on mastering his target shooting, and finding peace by going off-road in his 4×4.

Eric Gawecki - Co-owner of the GBG Building Services Ltd

Six steps to start your project with us:

Bespoke joinery - hand scraped oak vaneered panels and bronze custom made handle

Would you like to discuss

a property renovation?

Contact us