Insulation & Energy Efficiency Upgrades in London
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Lower bills. Higher comfort. Better performance.
Homeowners, landlords and commercial property owners across London are upgrading their buildings to be more energy-efficient, more comfortable and more future-ready.
At Bigness Group, we deliver professional insulation and energy efficiency upgrades designed to reduce heat loss, improve EPC ratings and create healthier indoor environments.
Whether it’s a single home, a rental property, a block of apartments or a commercial building, our team provides clean, certified and long-lasting energy improvements.
Our Insulation Services
Loft & Roof Insulation
High-performance mineral wool, PIR boards or spray foam alternatives (only where appropriate and breathable).
Internal Wall Insulation (IWI)
Thermal boards, insulated plasterboard systems and vapour-control solutions for solid-wall homes.
External Wall Insulation (EWI)
Full insulation and render systems for improved thermal efficiency and external appearance.
Floor & Underfloor Insulation
Suspended floor insulation, rigid boards and void treatments to reduce draughts and heat loss.
Cavity Wall Insulation
Drill-and-fill insulation for properties with suitable cavity construction.
Energy Efficiency Upgrades
Energy-Efficient Windows & Glazing Upgrades
High-performance double/triple glazing, low-E coatings and insulated frames.
Draught-Proofing & Airtightness Improvements
Sealing gaps, improving seals and enhancing overall thermal performance.
Heating System Upgrades
High-efficiency boilers, smart thermostats and air-source heat pumps.
Mechanical Ventilation (MVHR)
Heat recovery systems for improved air quality and reduced heat loss.
LED Lighting Upgrades
Efficient lighting design for homes and commercial sites.
Smart Energy Controls
Smart thermostats, zoning and energy monitoring.
EPC Improvements & Compliance
We help clients reach better EPC ratings, meet rental standards and reduce running costs.
Our work includes:
- EPC impact assessments
- Recommended measures planning
- Insulation and air tightness improvements
- Heating and ventilation upgrades
- Part L energy efficiency compliance
- Advice for landlords & commercial owners
Our approach is strategic: maximum impact, minimum disruption.
Our Installation Process
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Thermal Assessment & Survey
Identifying weak points, cold bridges and key upgrades. -
Specification & Planning
Selecting materials and solutions suited to the property type. -
Installation & Quality Control
Clean, efficient work with minimal disruption. -
Testing & EPC Reassessment
Ensuring measurable improvements. -
Certification & Handover
Compliance documents, warranties and material certifications.
Why Choose Bigness Group
- Premium insulation and retrofit materials
- Strong experience with London property types
- Clean, efficient installation teams
- EPC-focused strategies
- Solutions for both domestic and commercial buildings
- Compliant with Part L & PAS standards
- Long-term comfort, reduced bills, healthier homes
We deliver energy upgrades that improve both comfort and property value.
FAQ – Insulation & Energy Efficiency Upgrades
Q: Can you improve my EPC rating?
A: Yes — that’s one of our core goals.
Q: Do you handle both domestic and commercial properties?
A: Absolutely.
Q: Are your insulation materials breathable?
A: Yes — we choose the correct system for each building type.
Q: Can you install MVHR or smart heating systems?
A: Yes — full mechanical and heating upgrades available.
Our Energy Upgrade Projects in London
We’ve managed extensions, loft conversions, refurbishments, office fits-outs, commercial upgrades, industrial units and mixed-use developments across London. Every project is managed with strict attention to scheduling, budget and workmanship. Clients choose Bigness because they want one partner who can control every detail.
Energy Efficiency Works by Borough
Every borough has its own building stock, challenges and planning limitations. We have strong experience across: Kensington & Chelsea, Westminster, Camden, Islington, Brent, Barnet, Haringey, Hounslow, Ealing, Hillingdon, Southwark, Lambeth, Wandsworth. This knowledge helps us deliver the right solutions for each building type.
Barking and Dagenham / Barnet / Bexley / Brent / Bromley / Camden / Croydon / Ealing / Enfield / Greenwich / Hackney / Hammersmith and Fulham / Haringey / Harrow / Havering / Hillingdon / Hounslow / Islington / Kensington and Chelsea / Kingston upon Thames / Lambeth / Lewisham / Merton / Newham / Redbridge / Richmond upon Thames / Southwark / Sutton / Tower Hamlets / Waltham Forest / Wandsworth / Westminster
Practical thinking for better-managed buildings.
Guidance, technical insight and practical perspectives on compliance, maintenance, building performance and long-term improvement.
