Experienced building contractors specialising in quality extensions, loft conversions, new builds, full property renovations and commercial fit-outs.
Explore our workDiscuss your projectColemack Construction Ltd is led by directors Stuart Coles and Stuart McKenzie. Both are carpenters by trade, bringing nearly 30 years of experience each to every project.
From structural alterations and timber construction to complete homes and specialist interiors, we bring practical building knowledge and attention to detail to projects of all sizes.
We work closely with clients, architects, interior designers and other specialist trades to deliver the complete job.
We design and construct high-quality single- and two-storey extensions that create valuable extra space and complement your existing property. From groundworks and structural alterations to roofing, glazing and interior finishes, we manage every stage with care and attention to detail.
Make the most of your home with a professionally constructed loft conversion, tailored to your space and requirements. Whether creating additional bedrooms, an en-suite or a spacious master suite, our experienced team delivers the structural carpentry, roof alterations and finishing works needed to bring your plans to life.
From the initial construction stages to the finishing details, we undertake bespoke new-build projects with a practical, hands-on approach. Our extensive building and carpentry experience helps us coordinate the trades, maintain high standards of workmanship and deliver homes built for lasting quality.
We transform existing properties through comprehensive renovations, sympathetic refurbishments and carefully planned structural remodelling. From opening up living spaces and reconfiguring layouts to installing new kitchens and completing interior finishes, we focus on creating homes that are both beautiful and functional.
With almost 30 years of carpentry experience each, our directors bring specialist craftsmanship to every project. We undertake traditional cut roofs, timber framing, structural carpentry, roof construction and detailed first- and second-fix joinery, combining sound construction methods with precise workmanship.
We deliver commercial refurbishments and office fit-outs designed around the needs of each business. Working alongside architects and interior designers where required, we construct practical, well-finished spaces including partitions, bespoke layouts, glazed meeting rooms and feature interiors, with close attention to quality throughout.
A selection of our residential and commercial construction work. We are adding photographs from our completed projects as the portfolio develops.
A complete transformation of this family home, combining a two-storey side extension with a substantial rear extension and renovation throughout. Our work brought the existing property and new spaces together to create a larger, more practical home with a cohesive finish.
View project photos & details →A substantial structural transformation of a large bungalow into a two-storey property. We removed the existing roof, carried out the necessary first-floor structural alterations and constructed the new timber-framed upper storey, complete with a trussed roof and external cladding. A major project showcasing our specialist carpentry and timber construction experience.
View project photos & details →A spacious rear extension designed to transform everyday family living. The finished scheme includes a bespoke media wall, electrically operated rooflights and folding blinds, bifold doors, a dedicated utility room, practical dog-wash area and a built-in bar. A carefully planned combination of open living space and tailored features.
View project photos & details →An extensive remodelling of the rear of the property, involving the removal of the existing back section and construction of new living space. Our work reshaped the layout to create a more open, functional home, with the new construction integrated into the existing building.
View project photos & details →A complete two-level office fit-out delivered from a blank starting point. Working alongside the architect and interior designer, we created new office spaces and distinctive curved walls, bringing the design concept to life through accurate construction and careful attention to detail.
View project photos & details →A selection of residential building and interior works at Pond Croft Road, demonstrating the careful workmanship and finishing detail we bring to our projects. The gallery highlights areas of the completed property, with further project details to follow.
View project photos & details →
Colemack Construction opened up the front of this Welwyn property to create a traditional brick-built porch with a pitched tiled roof and exposed timber detailing. The new entrance also incorporates a compact shower room with WC, finished with classic metro tiling, decorative floor tiles and contemporary chrome fittings.
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We transformed the entrance to this home by opening up the front of the property and building a new brick-built porch designed to complement the existing house. Inside, the hallway was opened up and a new timber staircase with glass balustrading and a galleried landing created a brighter, more welcoming entrance.
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This substantial renovation transformed the layout and use of the property. We relocated the kitchen from the ground floor into the basement, carried out structural alterations to create a generous open-plan space, installed a handmade kitchen and opened up the rear with bifold doors. The ground floor was then refurbished to provide a new lounge and dining area.
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A substantial loft conversion designed to create two additional rooms and an ensuite bathroom. We carried out significant structural alterations to open up the roof space, transforming the upper floor into bright and practical accommodation.
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We constructed a carefully integrated rear extension and opened up the existing building with structural steelwork to create a more spacious kitchen and dining area. The project included the installation of a handmade kitchen and a full refurbishment of the connecting living space.
View project details →We understand construction from the tools up. Our directors are experienced carpenters who stay closely involved with the building work, coordinating the trades required to bring each project together.
Whether you are opening up the back of your home, creating a new floor or commissioning a full refurbishment, we focus on sound construction, clear communication and the finished result.
Tell us what you have in mind. Colemack Construction works across Hertfordshire, Bedfordshire, Cambridgeshire and London, on residential and commercial projects.
