Business Details
33 Years
experience
Award-Winning Construction Services in Borehamwood
Established in 1993, we have delivered over 500 high-end residential, public arts, and commercial construction projects across London. Our expertise spans new builds, refurbishments, and heritage conservation, with notable achievements including RIBA award-winning projects and Stirling Prize finalists. We collaborate with leading architects and developers, maintaining direct oversight through two company directors. Our commitment to quality is demonstrated through in-house craftsmanship, rigorous project management, and third-party health & safety audits. With a directly employed workforce, we ensure precision in brickwork, carpentry, and specialist finishes.Our portfolio includes iconic structures like Juergen Teller's Studio and the House in Highgate Cemetery. We provide end-to-end support from concept to completion, offering monthly progress reports and defect management. Our heritage work balances modern innovation with historical integrity, while commercial projects prioritise functionality and aesthetic excellence. This combination of experience, technical skill, and client-focused delivery has cemented our reputation as a trusted construction partner in London's competitive market.
Services
New Builds
Refurbishments
Basement Conversions
Heritage Conservation
Commercial Projects
Structural Alterations
Groundworks
Electrical Installations
Mechanical Installations
Landscaping
Details
- Year established: 1993
Highlights and features
- We have completed over 500 projects since 1993
- Our projects have received multiple RIBA awards
- We maintain a directly employed workforce of tradesmen
- Two company directors oversee each project personally
- We implement fortnightly third-party health & safety audits
Services
New Builds
We deliver bespoke new build projects combining architectural innovation with technical precision. Our process includes concept development, planning approvals, and full construction management. Clients benefit from our directly employed workforce and director-level oversight throughout the project lifecycle.
Heritage Conservation
Specialising in historic building preservation, we balance modern functionality with traditional craftsmanship. Our approach maintains structural integrity while incorporating contemporary requirements. Services include period-appropriate material sourcing and conservation-compliant construction techniques for listed buildings.
Commercial Projects
We execute commercial construction projects with emphasis on operational efficiency and aesthetic impact. Our capabilities span office spaces, retail units, and mixed-use developments. The process includes space optimisation, compliance management, and phased construction to minimise business disruption.
Basement Conversions
Our basement conversion service creates functional subterranean spaces with waterproofing certified by Newton Systems. We handle structural reinforcement, access solutions, and mechanical installations to transform underused areas into habitable environments.
Refurbishments
We undertake comprehensive building refurbishments that enhance property value and functionality. Services include structural upgrades, facade restoration, and modernisation of mechanical systems while maintaining architectural character in heritage contexts.
Questions
What types of construction projects do you specialise in?
We specialise in high-end residential, commercial, and heritage construction projects across London and surrounding areas.
How long has Harris Calnan been in business?
We have been delivering construction projects since 1993, completing over 500 developments to date.
Do you handle both new builds and renovations?
Yes, we provide both new build construction and comprehensive refurbishment services, including heritage conservation.
What makes your construction approach unique?
Our approach combines directly employed tradespeople, director-level oversight, and third-party safety audits for quality assurance.
Can you work on listed buildings?
Yes, we have extensive experience in heritage conservation and listed building renovations with award-winning credentials.
How do you ensure project quality?
We implement fortnightly health & safety audits, monthly progress reporting, and maintain direct workforce control for quality management.
