Skip to content Forget hidden costs, hand-offs, overdue timelines and middlemen overpricing your project. Our team of architects, builders and project managers offer a start-to-end, seamless solution for new builds and extension projects across the Midlands, incl. Northamptonshire, Warwickshire, Beds, Herts & Leics.
Transforming your home has never been easier. When you work with us, we’ll manage your entire home remodelling project from design-to-handover, with clear deadlines and budgets in mind, ready for use on day one of completion. By keeping everything under one roof, we make sure every stage runs smoothly as our tried-and-tested team are held accountable every step of the way, from build work to electrical, planning permissions, and structural engineering – you wont be left with guesswork.
“Les and him team were amazing. We had a two storey extension built – taking about 3 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.”
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.”
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 remodel transformed a tight layout into a spacious modern home, complete with new kitchen, bathrooms, joinery, and glazed extensions. Every detail—from the oak staircase to the garden-facing glass—was rebuilt for light.
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.
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.
When you work with L.D. Design & Build on your next home project, you’ll be working with our director and founder, Les, and Milena—our architectural designer who believes residential projects should be straightforward, well-managed, and built to last. Les brings years of hands-on experience on site, making sure every job runs smoothly and stays on budget. Milena handles the design side, turning ideas into practical plans that work in the real world.
We stay on schedule because we front-load every decision—each structural detail, finish and fixture is signed off before demolition begins—run one crew under a single chain of command, order long-lead items the same week you approve them (on our Great Houghton project a 14-week glazing package arrived exactly when the opening was ready, letting us hand over three days early), track progress through weekly micro-milestones so a one-day slip is caught immediately, and assign a dedicated site lead whose phone number you have, whose name is on every Friday report, and who signs off the snag list before you move back in.
Building or renovating a home shouldn’t ever be a gamble. From the offset, we’ll start with a proper walk-around — no guesswork. Whether it’s a tight London extension or a new-build on a sloped plot, we’ll assess access, services, tree issues, and planning restrictions early. You’ll get a clear breakdown of what’s possible, what’s not, and what it’s likely to cost. We will also produce early CGIs and feasibility sketches to help visualise things before you commit to spending on full plans.
This is where ideas take shape. Our architect Milena will turn your brief into a full set of scaled drawings, layouts and elevations — ready for planning submission and builder pricing.
We’ll handle permitted development, conservation queries, or full planning applications as needed. We also produce blueprints for structural engineers and building control, so nothing gets held up later. You’ll know exactly what’s being built, to what spec, and why.
No vague day-rates or shifting quotes — you get a fixed price, agreed up front, with every material and stage specified. We manage all trades in-house or through trusted subcontractors we’ve worked with for years. Materials are ordered in advance to avoid delays. You’ll get regular updates, and the site stays secure and tidy throughout — alarms, fencing, and access controls are standard.
Once the dust settles, we do a full walk-through, fix any snags fast, and hand over all warranties, certificates and manuals — boiler, electrics, glazing, roofing. We offer optional maintenance packages and always remain reachable if anything crops up. No chasing, no call centres — just direct contact with the same people who ran your job.
Building a home project or extension shouldn’t ever be a gamble. From the offset, we’ll start with a proper walk-around — no guesswork.
Whether it’s a tight London extension or a new-build on a sloped plot, we’ll assess access, services, tree issues, and planning restrictions early. You’ll get a clear breakdown of what’s possible, what’s not, and what it’s likely to cost. We will also produce early CGIs and feasibility sketches to help visualise things before you commit to working with us or spending on full plans.
This is where ideas take shape. Milena will turn your brief into a full set of scaled drawings, layouts and elevations — ready for planning submission and builder pricing. We’ll handle permitted development, conservation queries, or full planning applications as needed. We also produce blueprints for structural engineers and building control, so nothing gets held up later. You’ll know exactly what’s being built, to what spec, and why.
No vague day-rates or shifting quotes — you get a fixed price, agreed up front, with every material and stage specified. We manage all trades in-house or through trusted subcontractors we’ve worked with for years. Materials are ordered in advance to avoid delays. You’ll get regular updates, and the site stays secure and tidy throughout — alarms, fencing, and access controls are standard.
Once the dust settles, we do a full walk-through, fix any snags fast, and hand over all warranties, certificates and manuals — boiler, electrics, glazing, roofing. We offer optional maintenance packages and always remain reachable if anything crops up. No chasing, no call centres — just direct contact with the same people who ran your job.
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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