Specialising in bespoke house extensions, dormer loft conversions, whole-house structural renovations, luxury kitchens and designer landscaping across London and surrounding areas.
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GN Build Ltd understands that each project is unique, with specific challenges that must be understood and overcome. Led by founder Baljinder Singh (“Bali”), our dedicated team designs, procures and delivers superior craftsmanship from initial groundwork to final luxury handover.
Complete turnkey construction from architectural drawings through to building control certification.
Bali and senior directors personally supervise site progress daily to maintain exacting quality standards.
Sourced strictly from certified UK partners including British Steel RSJs and Kingspan insulation.
Over 80% of our business comes via personal referrals and returning property developers.
From single-storey wrap extensions to complete interior transformations, our certified trades deliver every trade under one trusted roof.
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Single & multi-storey extensions, wrap-arounds, side returns and open-plan kitchen diners designed for modern family living.
Transform unutilized roof spaces into luxurious master suites, contemporary home offices, or ensuite guest bedrooms.
Complete end-to-end renovations including rewiring, re-plumbing, structural layout reconfiguration and luxury finishes.
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Bespoke handleless cabinetry, quartz waterfall worktops, walk-in wet rooms, freestanding baths and custom designer tiling.
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Energy-efficient wet underfloor heating manifolds, new boiler installations, smart multizone thermostats and architectural lighting.
Weatherproof silicone through-colour rendering, block-paved driveways, premium porcelain garden patios and outbuildings.
Every photo in our portfolio is captured directly on our real client jobs across London and surrounding areas, showing honest craftsmanship at every stage.
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Single & Two-Storey Additions, RSJ Knock-Throughs & Brickwork
Comprehensive structural house extensions delivered from initial groundwork excavation to weathertight envelope across London and surrounding areas. Featuring deep concrete trench footings, heavy British Steel RSJ goalpost insertions for uninterrupted open-plan spans, sub-base concrete slabs, cavity wall construction, and high-insulation warm-roof systems.
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Turnkey Refurbishments, Bare-Brick Remodelling & Heating
Full-scale luxury refurbishment of residential homes across London and surrounding areas. Strip back to bare brick, complete structural load redistributions with massive steel beams, acoustic insulation, multi-zone wet underfloor heating, bespoke bathrooms and integrated wellness suites.
From the first site survey to the day we hand over your sparkling clean keys, every milestone is managed with clear timelines, transparent communication and zero surprises.
We meet at your property to examine feasibility, assess site conditions, discuss layout ideas and provide a free, fully itemised fixed-price estimate.
Our structural engineers produce calculations, submit building control notices, secure party wall agreements, and schedule all plant machinery and materials.
Our certified builders execute groundworks, RSJ steel erection, brickwork, roofing, and 1st/2nd fix services with daily on-site director supervision.
Independent building control officers sign off completion certificates, we carry out deep site cleaning, and deliver your 10-year structural warranty.
Rated 4.9★ across verified Google Reviews. Read real feedback from homeowners across London and surrounding areas.
“This is actually the second major job Baljinder and his team at GN Build have completed for us. They originally carried out our full house refurbishment and extension in 2021, and after being happy with that work we used them again for 60m² of porcelain paving patios, side paths and lawn. Baljinder was reliable and easy to deal with throughout. Would happily use them again!”
“Wonderful people! I was looking for someone to build an outbuilding and back side extension. They initially said 6 weeks but finished within 5 weeks! They didn't rush at all, worked very hard and their work is neat. I ended up doing my bathroom and other work around the house. No issues at all and lots of compliments. I was so lucky to find them!”
“Baj and his team were amazing. They built our garden outhouse and landscaped the garden. It was gruelling work as we did not have a side access; his team worked tirelessly and carried everything by hand through the house. They were very professional, polite, clean and reasonably priced. Highly recommended.”
“I have nothing but praise for Baljinder (Bali) and his team. I first used Bali in 2015 when he installed my kitchen and have used him ever since for all my building needs. He is my go-to person for any building work, big or small. He’s a gentleman and a pleasure to have around. Bali is a highly skilled builder who won’t let you down.”
“Superb job! Had the front of my 1930s pebble dash house silicone rendered and insulated. They removed all the old surface fully before taking their time to complete a clean finish... leaving the house looking like brand new. Friendly, accommodating, reasonably priced and efficient. Would happily recommend Bal and the team!”
“I had the pleasure of working with Bali and his team who led our full house renovation, including loft, single rear and side return extensions. He was extremely accommodating to our needs, had great suggestions and walked us through everything. Couldn't recommend them more.”
Our building teams operate daily across all of London and surrounding areas, providing fast on-site surveys, expert advice, and punctual project starts.
Contact our directors directly for a free site visit, structural advice, and a comprehensive fixed-price quotation.
