Skip to content Based in Northampton, we’ve delivered hundreds of projects across the county and beyond, winning a reputation for tidy sites, honest communication and finishes that last.
At L.D Design and Build, we specialise in bespoke extensions in Northamptonshire and the Midlands—without the headache of juggling architects, builders and paperwork. From designing your idea to hand-over, we handle every step in-house: concept sketches, planning approval, structural engineering and full-spec construction. The result is a seamless process that keeps budgets clear, timelines tight and craftsmanship consistently high.
Whether it’s a light-filled rear kitchen, a two-storey side wing or a wrap-around that completely reimagines the ground floor, we design each extension to feel as though it was always part of the original house—only better insulated, better lit and built for modern living. Based in Northampton, we’ve delivered hundreds of projects across the county and beyond, winning a reputation for tidy sites, honest communication and finishes that last.
“Les and him team were amazing. We had a two storey extension built – taking about 7 months in all. Les has a team who can take on all aspects of the build – and a long list of contacts for any jobs that needed a specialist (windows, gas etc). The quality of the build has been amazing – especially the detail of the finishing – tiling, plastering.”
This 1970s 2-bedroom house in Great Houghton was completely transformed—inside and out— into a modern 4-bedroom home. The result was a light-filled, family home that fits seamlessly into its village setting. Read more.
This rear extension adds a clean, modern cube to a traditional brick home, featuring full-height glazing on two sides and clean white render throughout. Slimline frames and bifold doors open fully onto a new patio.
This mid-century home at Spyglass Hill was extended with a full-width rear extension, opening up the kitchen and living space to panoramic views. A new glazed terrace and steel-framed overhang complete the indoor-outdoor transition.
This modern conversion completely transformed a dated layout into a bright, open-plan family home. With a full-width rear extension and total reconfiguration, the space now flows naturally from kitchen to dining to lounge.
While respecting the original design and tudor-style characteristics, this two-storey home extension added a two-door garage and top floor studio space to a small home in a historic town.
This Northamptonshire pitched-roof extension added a newly remodelled kitchen to the original home.
Our team and interior showroom are based in Northampton and complete around 30 conversion projects a year across Northamptonshire and the Midlands, including Lincolnshire, Leicestershire, Bedfordshire and Hertfordshire. Occasionally we also complete projects in London.
I recently had the pleasure of working with Leszek on a loft conversion, and I cannot recommend him highly enough. The project has now been completed, and I am thrilled with the results. From the outset, Leszek and his team demonstrated an incredible level of professionalism and skill. The team was on-site from Monday to Friday, and often on Saturdays as well, demonstrating their commitment to meeting deadlines.
The initial plan was to extend into the garage and vault the bedroom ceiling. However Les was able to do much more within the budget and had some great ideas. We finished with what we wanted plus more – new kitchen, ground floor underfloor heating, new patio and front door, dressing room in loft space above extension. Some aspects took longer than first thought, but all finished to high standard.
“Les and his team were fantastic from start to finish. Arriving on time and working solidly to a high standard. They left the house clean each day and were careful to protect carpets and other elements of the house. Les also managed to contact the Local Authority after the planning permission via the portal went to the incorrect area. He made several calls and nothing was too much trouble.”
“Leszek is more than just your average builder, he listened to our needs, gave us the right advice and more importantly the best price/quote by far vs other builders. His team was made of very respectful and friendly guys who came to work on time, always clean after themselves, worked long hours and without disturbing us and/or our neighbours, as they completed the work within the agreed timeline.”
“We had a two storey extension built – taking about 1 month in all… Les was in constant touch with us taking pictures at every stage of the project so we knew exactly where they were at. The cost came in exactly as had been quoted and was cheaper than most of the quotes we had received. He was even able to offer advice on layout of the rooms – that was far more helpful than our architect had been.”
Most people aren’t looking for luxury — they’re looking for peace of mind. That’s where we come in. We don’t just build well — we manage the entire process so you don’t have to chase trades, second-guess quotes, or babysit your own project
Design, planning, and build are all under one roof, with Milena on design and Les on-site. No handovers, no crossed wires.
We don’t sugar-coat timelines or budgets. You’ll get honest advice, upfront prices, and no mysterious extras halfway through.
From tight Victorian terrace extensions to full newbuilds with basements, we’ve done it. We know where jobs go wrong — and how to stop that happening.
Our plans don’t just look good on paper. They’re practical, buildable, and shaped by real costs and site realities.
We don’t vanish after the final invoice. If something’s not right, we sort it — fast.
Our multidisciplinary team of builders and architects builds loft conversions, extensions, bespoke homes and full renovations across Northamptonshire, Beds, Herts, Leics and London.
07722 931994
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