40+
Years Combined Experience
500+
Projects Completed
100%
Fully Insured
5★
Rated by Clients
About the company
Experienced Builders in Portsmouth
J A Build & Develop is a Portsmouth-based building company backed by over 40 years of combined industry experience. We specialise in house extensions, loft conversions, full property renovations, structural alterations and commercial construction across Portsmouth, Hampshire and the surrounding areas.
From the initial survey through to completion, every project is carefully managed with a focus on quality workmanship, clear communication and reliable delivery. Whether we're extending a family home or delivering a commercial project, we approach every build with the same attention to detail and high standards.
What We Do
Complete Building Services
J A Build & Develop, based in Portsmouth, provides high-quality building services across Hampshire and the South of England, from home renovations and extensions to complete commercial developments.
Extensions
Single-storey, double-storey, and wrap-around extensions that add space and value to your home.
Loft Conversions
Dormer, hip-to-gable, and mansard conversions — unlock the space above your head without losing your garden.
General Building & Renovations
Complete home renovations, structural repairs, and refurbishments carried out to the highest standard.
Insurance Works
Experienced in handling insurance claims and reinstatement works — from storm and flood damage to fire and subsidence repairs.
Property Development
Residential new builds and mixed-use developments — from groundworks to turnkey handover.
HMO Conversions
Full HMO conversions meeting all licensing and fire safety requirements — maximise your rental yield.
Basement Conversions
Unlock valuable living space below ground — from cellar conversions to full dig-outs, waterproofing and fit-out.
Brickwork & Masonry
New brick walls, repointing, chimney repairs, and decorative stonework — solid craftsmanship built to last.
Plumbing & Heating
Boiler installations, central heating, underfloor heating, and full bathroom plumbing by Gas Safe registered engineers.
Why Choose Us
Building exceptional homes with uncompromising standards.
At J A Build & Develop, we believe true value comes from quality, reliability, and attention to detail. Every project is personally overseen, delivered on schedule, and finished to the highest standard before completion. That's why homeowners across the South of England trust us with their most important investments.
Free consultations
We visit your site, assess the project, and give honest advice — at no charge.
Planning Permission & Drawings
Not sure if you need planning permission? We can help guide you through the process, liaise with your local authority, and provide structural calculations and architectural drawings to get your project approved.
Based in Portsmouth
Local knowledge, local teams across Portsmouth, Hampshire and the surrounding areas. We understand the local planning rules and building regulations inside out.
Our Work
Recent Projects
A selection of completed builds, renovations, and extensions across Hampshire and the surrounding areas.
Southampton, Hampshire
Victorian Terrace Renovation
Winchester, Hampshire
Rear Kitchen Extension
Romsey, Hampshire
Period Farmhouse Renovation
Portsmouth, Hampshire
Commercial Office Fit-Out
Fareham, Hampshire
Loft Conversion
Free Quote
Ready to Start Your Project?
Tell us about your build. We'll be in touch with honest advice and a free, no-obligation quote.