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Trusted Builders in Hemel Hempstead for Over 35 Years
Established over 35 years ago, S Johnson & Sons Builders has built a reputation for delivering high-quality building services across Hemel Hempstead and surrounding areas. Our family-run business combines traditional craftsmanship with modern techniques to provide comprehensive solutions for home extensions, renovations, and structural alterations. With a focus on transparency and client collaboration, we manage projects from foundations to final touches, ensuring meticulous attention to detail at every stage.

Our team of skilled tradesmen works on-site daily, offering weekly progress updates and maintaining open communication throughout the build. Backed by public liability insurance and a commitment to competitive pricing, we prioritise client satisfaction through reliable service and durable results. Testimonials highlight our professionalism, punctuality, and ability to complete projects within budget while minimising disruption to residents and neighbours.
Services
Home Extensions Garage Conversions Loft Conversions Project Management Porches & Driveways Structural Alterations Bathroom Fitting Plumbing & Electrical Landscaping Damp Proofing
Highlights and features
  • We offer free estimates and expert advice with no obligation
  • Full public liability insurance for complete client protection
  • Family-run business with 35+ years of local construction experience
  • All work completed by in-house tradesmen with daily site presence
  • Competitive pricing maintained through direct contractor relationships
What people say
Genuine decent guys Very reliable Good people to work with Quotes competitive Excellent finished results
Services
Home Extensions
Transform your living space with custom-designed home extensions that enhance property value and functionality. Our full-service approach includes architectural coordination, foundation work, and finishing touches. With daily tradesmen presence and weekly progress updates, we ensure seamless execution from planning to completion.
Garage Conversions
Convert existing garages into functional living areas including kitchens, utility rooms, and storage spaces. We handle structural modifications, electrical upgrades, and interior finishes while maintaining building regulations compliance. Clients praise our ability to complete projects within agreed budgets.
Project Management
Comprehensive project management covering all construction phases from foundations to final inspections. Our team coordinates material procurement, trades scheduling, and quality control, providing clients with peace of mind through regular site visits and transparent communication channels.
Porches & Driveways
Design and installation of durable porches, driveways, and outdoor living spaces. Services include ground preparation, concrete work, and installation of fencing or paving. Our efficient approach minimises disruption while ensuring long-lasting results that enhance property kerb appeal.
Structural Alterations
Expert structural modifications including steelwork installations, chimney reinforcement, and load-bearing wall adjustments. We provide necessary calculations and planning support, with recent projects demonstrating our capability to handle complex engineering challenges while maintaining safety standards.
People
Simon Johnson
Director
With over 35 years in the construction industry, Simon leads projects personally, ensuring quality control and client satisfaction. His hands-on approach and commitment to transparent communication have earned repeat business and client recommendations across Hertfordshire.
Questions
What building services do you specialise in?
We specialise in home extensions, garage conversions, loft conversions, structural alterations, and full property renovations across Hemel Hempstead and surrounding areas.
How long has the company been operating?
Simon Johnson has over 35 years of construction experience, with the current company structure established to serve local communities continuously.
Do you provide project management services?
Yes, we offer full project management including material sourcing, trades coordination, and regular client updates throughout the construction process.
Are your builders insured?
We carry full public liability insurance for all projects, providing clients with complete protection during the construction period.
How do you handle client communication?
We maintain daily contact through on-site presence and weekly progress reports, with direct access to Simon Johnson for any concerns or adjustments.
What areas do you cover?
Primarily serving Hemel Hempstead and Hertfordshire, we also undertake projects in surrounding counties with competitive pricing maintained across all locations.