Comfort That Lasts
Craftsmanship
You Can Trust
Experts in Insulation, Rendering & Construction Across Bristol and the South West.
Trusted Bristol Builders Specialising
in Insulation & Rendering
High-Quality Building Services with Energy-Saving Expertise
LenexBris is a full-service construction company in Bristol, delivering high-quality building work for homeowners across the South West. From home extensions and loft conversions to complete refurbishments, we bring reliable craftsmanship and proven experience to every stage of the build.
What sets us apart? We don’t just build, we optimise. As certified specialists in External Wall Insulation (EWI), Rendering, and Infrared Heating, we help create homes that are not only beautiful, but energy efficient, future-ready, and built to last.
Whether you’re updating a single room or taking on a full property transformation, our team of builders, renderers, and insulation experts work as one to bring your vision to life safely, efficiently, and with zero shortcuts.
We’re fully certified, locally trusted, and committed to quality at every stage. If you’re looking for experienced builders in Bristol who can do it all from structural work to finishing touches, LenexBris is ready to deliver.
Construction Expertise with a Focus on Insulation, Efficiency, and Long-Term Value
At LenexBris, we’re not just another construction company in Bristol. We’re a team of certified professionals delivering full building services with a focus on quality, energy efficiency, and long-term performance.
From External Wall Insulation (EWI) and silicone rendering to infrared heating, our expertise goes beyond bricks and mortar. We help homeowners cut heat loss, improve EPC ratings, and create homes that are both comfortable and futureproof.
But construction is at our core. Whether it’s a loft conversion, house extension, or complete refurbishment, we approach every project with a builder’s precision and an energy expert’s mindset. That means every detail from structural work to finishing touches is handled with performance, durability, and compliance in mind.
All our systems are BBA-certified and installed by trained professionals. No quick fixes. No shortcuts. Just honest, reliable work that delivers lasting results, inside and out.
If you’re looking for builders in Bristol who combine craftsmanship with forward-thinking home solutions, LenexBris is the name to trust.
LENEX BRIS
Our Services
External Wall Insulation
Improve energy efficiency, reduce heat loss, and enhance external appearance.
Rendering
Durable, breathable renders that protect your home and elevate its aesthetic.
Infrared Heating
Sleek, space-saving heating systems designed for comfort and efficiency.
Full Refurbishment
From layout changes to total overhauls, we bring your vision to life.
Loft Conversions
Unlock hidden space with expertly crafted, fully compliant conversions.
Extensions
Add space and value to your property with seamless, stress-free builds.
Built on Trust. Backed by Credentials.
Every project we deliver is guided by experience, reliability, and technical precision, whether it’s external wall insulation, a full house refurbishment, or a structural extension.
As a certified construction company in Bristol, we’re proud members of the Federation of Master Builders and fully TrustMark approved. We use only BBA-certified systems and work with proven suppliers like Weber, Parex, STO, and EWI PRO to ensure our materials match the quality of our craft.
Our clients trust us because we manage the full journey, from site assessment and planning to build, finish, and handover. No substandard shortcuts. No stress. Just dependable service across all major trades, delivered with care and accountability.
If you’re looking for builders in Bristol who bring both construction expertise and insulation specialism to the table, LenexBris is ready to get to work.
Safety and Service. Always our Priority
GET A FREE QUOTESatisfaction
Guaranteed
We treat every project with the respect it deserves, and don’t stop until you are satisfied.
View All Services-
All our technicians are trained and certified
-
Satisfaction guaranteed on every project
-
7+ years experience
-
Residential and commercial services
Recent Projects
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
View More ProjectsReviews
Ready to Build Better?
Whether it’s insulation, rendering, or full home transformation, we’ll help you create a warmer, smarter space that lasts.
FAQ
What types of building work do you offer?
LenexBris is a full-service construction company based in Bristol, offering a wide range of residential building services. This includes external wall insulation, rendering, infrared heating, loft conversions, house extensions, and full property refurbishments. Whether you need energy-efficient upgrades or a full structural transformation, we handle every stage from planning to completion, with quality and compliance at the core of everything we do.
Do I need planning permission for a loft conversion or extension?
Many loft conversions and house extensions fall under permitted development rights, meaning they don’t require full planning permission. However, it depends on your property type, the size of the build, and local council guidelines. During your quote process, we’ll assess everything and advise you on whether permissions are needed. If so, we’ll handle all the paperwork.
Are you certified and insured?
Yes. LenexBris is TrustMark registered and a proud member of the Federation of Master Builders. We’re fully insured for all the work we carry out, and our team only uses BBA-certified materials and systems. This ensures everything we install, from insulation systems to structural builds, meets strict quality, safety, and performance standards.
Do you work outside of Bristol?
While we’re based in Bristol, we often take on projects in the surrounding areas, including Bath, Weston-super-Mare, Gloucester, and nearby villages. If you’re unsure whether we cover your location, just get in touch. We’re happy to advise or connect you with a trusted local partner if needed.
How do I get a quote for building work?
It’s simple. Use our “Request a Free Quote” form, give us a call at 0117 965 4777, or email us at info@lenexbris.com. We’ll arrange a quick site visit to understand your needs, assess your property, and provide a clear, no-obligation quote. Every project is different, so we make sure you get transparent pricing and a realistic timeline before anything starts.
Can I combine insulation with a bigger renovation project?
Yes, and in fact, we recommend it. Many of our clients choose to combine external wall insulation with extensions, loft conversions, or full refurbishments. This approach is more efficient, reduces disruption, and maximises both cost savings and energy performance. Our team will work with you to build a phased plan that aligns with your goals and budget.
How long will my project take?
It depends on the size and scope. For example, EWI or rendering typically takes 1–2 weeks. A loft conversion or extension might take 4–8 weeks, depending on complexity and weather conditions. We provide clear timelines up front and keep you informed throughout the build, so there are no surprises.
Request Your Free Quote Today
Tell us what you need. We’ll quote it properly, price it fairly, and explain what’s possible. It’s free, and there’s zero pressure.
Call: 0117 965 4777 | Email: info@lenexbris.com
Looking for trusted builders in Bristol who know what they’re doing and won’t waste your time?