Business Details
28 Years
experience
Expert Building Services in Kent & London
Hennessy has been delivering high-quality building and maintenance services across Kent and London since 1998. As a family-run business, we combine decades of industry experience with a commitment to reliability, competitive pricing, and technical excellence. Our team of fully insured, skilled tradesmen specialises in extensions, loft conversions, roofing, plumbing, and comprehensive property repairs, serving both private and public sectors. With a focus on customer satisfaction, we offer end-to-end solutions from design to completion, backed by a 10-year IWA insurance guarantee on major projects.Our reputation for punctuality, transparency, and exceptional workmanship has been built through over 25 years of consistent service delivery. We maintain strong partnerships with architects and designers to ensure seamless project execution, whether for domestic renovations or commercial developments.
Services
Extensions
Loft Conversions
Roofing
Plumbing & Heating
Electrical
Details
- Year established: 1998
Highlights and features
- 25+ years of experience in construction and property maintenance
- Family-run business with direct owner involvement
- 10-year insurance-backed guarantees on major projects
- Fully qualified, insured tradesmen across all disciplines
- End-to-end project management from design to completion
What people say
Exemplary relationship
Done on time
Highly professional
Second to none attention to detail
Completed to high standard
Services
Extensions
Hennessy's extension service simplifies property expansion with end-to-end management. We handle planning permissions, design, and construction for single or multi-story extensions. Our team ensures compliance with building regulations while maintaining structural integrity and aesthetic coherence with existing properties.
Loft Conversions
Specialist loft conversion solutions maximising property space and value. We manage structural modifications, insulation, and staircase installations while ensuring compliance with safety standards. Projects include dormer, mansard, and hip-to-gable conversions tailored to client requirements.
Roofing
Comprehensive roofing services covering tiled, flat, and slated roofs. We repair guttering, fascias, and structural damage while offering full roof replacements. Preventative maintenance packages ensure long-term property protection against weather damage.
Plumbing & Heating
Full domestic and commercial plumbing solutions including boiler installations, central heating systems, and emergency leak repairs. Our certified engineers provide energy-efficient heating upgrades and pipework maintenance with 24-hour call-out availability.
Electrical
Professional electrical installations and repairs for residential and commercial properties. Services include fuse board upgrades, emergency lighting, and full rewiring. All work complies with BS7671 standards, with detailed testing and certification provided.
People
Brendan Hennessy
Director
With 25+ years in construction, Brendan oversees project delivery and quality assurance. His expertise in heritage building restoration and commercial developments ensures technical excellence across all projects.
Mark Hennessy
Director
Managing director responsible for client relations and business development. Mark's focus on customer service and operational efficiency has driven the company's growth since 1998.
Questions
What areas do you cover?
We operate throughout Kent and London, with our main office located in Hextable, BR8 7SE.
Do you offer guarantees on your work?
All major projects include a 10-year IWA insurance-backed guarantee covering structural elements.
How long has your company been trading?
Hennessy has provided building services since incorporation in 1998, with directors having industry experience since 1990.
Can you manage full property renovations?
Yes, we offer complete design-and-build solutions for residential and commercial renovations, including heritage building restoration.
Are your tradesmen fully qualified?
All operatives hold relevant certifications, with electricians, plumbers, and roofers registered with appropriate trade bodies.
Reviews (1)
Elaine Carey
Aug 15, 2019
Report
We never provide recommendations about companies because people have different expectations of what they consider good work. However, we are so impressed with the professionalism and expertise of Henessey that we are more than happy to make an exception. If you want a professional service carried out to a high standard with a company that keeps you informed every step of the way you could do no better than choosing this company.
Hennessey installed a new boiler, earthed our water, removed our pebble dash and then re-dashed and half rendered the house. All to our complete satisfaction.It was so
Hennessey installed a new boiler, earthed our water, removed our pebble dash and then re-dashed and half rendered the house. All to our complete satisfaction.It was so
