What We Do
Building Services in Portsmouth & Hampshire
From home extensions and loft conversions to full renovations and commercial construction, J A Build & Develop provides professional building services in Portsmouth, across Hampshire and throughout the South of England.
More space. More value. Less hassle.
Extensions
A well-designed home extension is one of the best ways to create more space and add value to your property. J A Build & Develop delivers high-quality home extensions in Portsmouth and across Hampshire, managing everything from planning and building regulations through to structural work, construction and the final finish.
- Single-storey rear extensions
- Double-storey extensions
- Side-return extensions
- Wrap-around extensions
- Orangeries and garden rooms
- Planning permission guidance
- Structural calculations & architectural drawings
Unlock the space above your head.
Loft Conversions
A loft conversion is one of the most effective ways to create additional living space without sacrificing your garden. J A Build & Develop delivers high-quality loft conversions in Portsmouth and across Hampshire, managing everything from structural steelwork and building regulations through to insulation, plumbing, electrics and the final decoration.
- Dormer loft conversions
- Hip-to-gable conversions
- Mansard conversions
- Velux / rooflight conversions
- En-suite and bathroom fitting
- Planning permission guidance
- Structural calculations & architectural drawings
Bringing tired properties back to life.
General Building & Renovations
J A Build & Develop is a Portsmouth-based building company providing high-quality general building and renovation services throughout Portsmouth, Hampshire and the surrounding areas. From complete property renovations and structural alterations to smaller building works, our experienced team manages each project with a strong focus on workmanship, reliability and attention to detail.
- Full-house refurbishments
- Structural repairs and underpinning
- Internal reconfigurations
- Plastering, rendering, and finishing
- Bathroom and kitchen fitting
- Period property restoration
Built to perform. Delivered on time.
Commercial Construction
We work with businesses, landlords, and developers on commercial projects of all sizes. Our commercial team understands the importance of programme, budget, and quality — and we deliver on all three.
- Office fit-outs and refurbishments
- Retail and hospitality builds
- Industrial and warehouse units
- Landlord and tenant works
- Strip-out and demolition
- CDM-compliant project management
From plot to profit.
Property Development
We partner with developers and investors to deliver residential and mixed-use property development projects. From site acquisition advice through to full build and handover, we bring the experience and expertise to maximise the value of every development.
- Residential new builds
- Site clearance and groundworks
- Full project management
- Planning permission support
- Structural calculations & architectural drawings
- Turnkey build and handover
Maximise your rental yield.
HMO Conversions
We specialise in converting residential properties into Houses in Multiple Occupation (HMOs). From layout redesign and fire safety compliance through to full fit-out, we deliver HMO conversions that meet all licensing requirements and attract quality tenants.
- Full property conversion and fit-out
- Fire safety and compartmentalisation
- HMO licensing compliance
- En-suite and bathroom installation
- Kitchen and communal area fit-out
- Planning permission guidance
Reliable pipework. Efficient heating systems.
Plumbing & Heating
From new boiler installations and central heating systems to full bathroom plumbing and pipework, our qualified plumbers and heating engineers deliver reliable, efficient solutions for residential and commercial properties across Hampshire.
- Boiler installation and replacement
- Central heating system installation
- Underfloor heating
- Bathroom and en-suite plumbing
- Radiator installation and upgrades
- Pipework installation and repairs
- Gas Safe registered engineers
- Annual boiler servicing
Solid craftsmanship. Built to last.
Brickwork & Masonry
From new brick walls and repointing to chimney repairs and decorative stonework, our brickwork and masonry team delivers high-quality results on both residential and commercial projects. We take pride in matching existing materials and finishes to ensure a seamless result.
- New brick walls and boundary walls
- Repointing and mortar repairs
- Chimney repairs and rebuilds
- Decorative brickwork and feature walls
- Retaining walls and garden structures
- Stone and block work
- Matching existing brickwork and materials
Go below to gain above.
Basement Conversions
A basement conversion unlocks valuable living space that's often overlooked. Whether you're converting an existing cellar or undertaking a full dig-out, we manage the entire process — from waterproofing and structural work through to full fit-out and finishing.
- Cellar and basement conversions
- Full dig-out and underpinning
- Tanking and waterproofing systems
- Structural steelwork and reinforcement
- Natural light solutions — lightwells and sun tunnels
- Full fit-out including electrics, plumbing and plastering
Our Process
How We Work
A straightforward process designed to keep you informed and in control at every stage.
Free Consultation
We visit your site, listen to your brief, and give honest advice — completely free of charge.
Detailed Quote
You receive a clear, transparent quote with no hidden costs. We explain everything upfront.
Build Begins
Your dedicated project manager oversees every stage, keeping you updated throughout.
Handover
We complete a thorough inspection before handing over the keys. Your satisfaction is our sign-off.
Not sure which service you need?
Get in touch and we'll talk you through your options — no pressure, no obligation.