Jb Carpentry Plus Ltd

JB Carpentry Plus Ltd is a Hertfordshire-based building company specialising in high-quality house extensions and conversions, delivering well-planned residential projects from initial concept through to completion. Established in 2010, we focus on projects that require careful coordination, structural understanding and attention to detail, bringing together all elements of the build under one managed process. This approach allows us to deliver homes that feel cohesive, practical and purpose-designed, not simply extended or altered as an afterthought.

By managing the full scope of works in-house, we provide clients with a single point of responsibility, clear communication throughout the build, and confidence that every stage is delivered to a consistently high standard. Founder James Brand remains closely involved in every project, ensuring that standards are upheld and that clients always have a clear point of contact throughout the build. This hands-on approach, combined with a carefully selected professional trade team, allows projects to run smoothly and consistently from start to finish.

We specialise in the design and construction of high-quality house extensions and conversions, delivering well-planned builds that add meaningful space and long-term value to your home. From groundwork, drainage and structural alterations to steelworks, roofing, and final finishes, we manage the entire build process from start to completion, ensuring every stage is coordinated, compliant, and built to a consistently high standard. Our experienced team handles complex projects including single and double-storey extensions, loft and garage conversions, and major structural reconfiguration, with careful attention to sequencing, detailing and site management throughout.