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Office - 01438 216138

Mobile - 07890681129

Email - info@jharrisbuilding.com

Testimonial - Knebworth, Hertfordshire - Large 3 storey rear, side and loft extension plus renovation works to existing house.
James is an extremely professional and knowledgeable builder. He ran the entire build very well, managing all aspects from start to finish and was on call at any time during the entire 6 month build. His technical knowledge and attention to detail was exceptional. James and team can clearly handle both small and very large builds. James and team were very friendly throughout and James's knowledge and attitude made him very easy to work with. We would highly recommend as a quality builder - Checkatrade.com

J Harris Design and Build are a construction company that deliver on time, on budget and with attention to detail that result in the highest quality finish.


Currently working alongside some of London and Hertfordshire leading architects on projects in around the surrounding area.  


We know it is the technical details that will turn your project from concept into something special.


Feel assured by our itemised costings spreadsheet produced as part of our quotation pack.


A fixed price that gives you full peace of mind and confidence in the way in which your budget is managed.


Clear lines of communication geared towards delivering client with a personal service which puts their needs and requirements first. 

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  • Architectural Drawings 
  • Engineers Calculations
  • Full Planning
  • Home Extensions
  • Loft Conversions
  • Roofing
  • Landscaping and Ground Work
  • Kitchen Installs
  • Bathroom Installs
  • Ceramic Tiling
  • Plastering
  • Rendering
  • Flooring
  • Plumbing Work
  • Electrical Work
  • Windows
  • Driveways
  • Structural Steel Work
  • Stair Cases 
  • Bespoke Carpentary