Home Retrofit & Extensions for Homeowners Your home deserves
to be warm and quiet.
Cold spots in winter. Overheating in summer. Bills that keep climbing. Energy-efficient construction — done with European materials and building-physics-aware detailing — deals with all three at the source: the fabric, the glazing and the ventilation.
Where the heat in a typical UK home goes.
The average UK home loses heat through poorly insulated walls, draughty windows and inadequate ventilation. You pay for warmth that disappears through the fabric of your building.
Energy-efficient construction changes that. Not with complex technology — but with careful building physics. Superior insulation, airtight construction, controlled ventilation and quality windows that work together to keep heat exactly where it belongs: inside your home.
The result is a home that stays comfortable all year round at a fraction of the running cost — and lasts for generations.
Everything you need. Nothing you don't.
Extensions & Refurbishments
Quality extensions, deep renovations and full-house refurbs across Herefordshire, Worcestershire and Gloucestershire. European materials, building-physics-aware detailing, personal oversight from Paweł.
Kitchens, bathrooms, single and two-storey extensions, loft conversions, garage conversions, energy improvements (insulation, windows, doors). See full details →
EnerPHit Deep Retrofit
Working towards full EnerPHit retrofits. We're currently scoping our first EnerPHit projects and taking early-stage enquiries. Up to 90% heating reduction is achievable under PHI criteria.
Includes: PHPP-informed pre-assessment, fabric specification, European materials, airtightness works, MVHR installation coordination, blower door testing.
Passive House New Build
Energy-efficient new builds designed to Passive House principles. Traditional masonry or modular timber frame — with European materials and PHPP-informed pre-assessment.
Architectural drawings via our trusted UK architect partner — available to homeowners arriving without an architect already engaged. First new-build PH projects being scoped for 2026–2027. Early-stage enquiries welcome.
PHPP Pre-Assessment
Not sure where to start? Paweł will run a PHPP-informed pre-assessment of your home (what PHPP is): heat loss overview, EnerPHit feasibility, EPC improvement pathway, and indicative cost range.
Full certified PHPP models available through our PHI-accredited partner. UK-wide remote service.
How a project works
Seven clear steps. No surprises. Paweł involved at every stage.
Built to last. Backed in writing.
Begin with a free conversation.
Tell us about your home. We'll tell you what's possible and what it takes to get there.
Book Free Assessment 07711 266 107Call Paweł directly
Worth reading before you commit
We Are Building the Next Retrofit Programme
Buying or extending? An EPC tells you nothing about whether the bedroom sits at 27°C in August. Six questions that cost nothing to ask.
For HomeownersEnerPHit Retrofit in the UK: The Complete Guide
Costs, the seven-stage process, realistic energy savings, planning and Building Control, and how to choose a contractor.
Costs0% VAT on Energy Saving Materials
What the 0% VAT rate covers, and what it does not — scope, limits, and the two deadlines that behave differently from one another.
CostsDeep Retrofit Cost UK 2026
An honest element-by-element breakdown at 2026 prices, with £100k and £200k budget scenarios.
Homeowner questions about deep retrofit
What to expect when retrofitting your home to EnerPHit-route or low-energy standard.
What is EnerPHit retrofit and is it right for my home?
EnerPHit is the Passive House Institute's certification route for existing buildings, focused on dramatically reducing heating demand through high-performance insulation, airtightness, triple glazing and MVHR. Published EnerPHit case studies typically report an 85–90% cut in space-heating demand, and the route suits most UK masonry or timber-frame homes. APMBuild has not yet completed an EnerPHit project; a PHPP pre-assessment gives the predicted figure for your house.
How much can I save on heating with a retrofit?
Published EnerPHit case studies typically report an 85–90% reduction in space-heating demand against the pre-retrofit baseline. APMBuild has not yet completed an EnerPHit project, so the figure for your house comes from a PHPP pre-assessment, not from our track record. Actual bill savings depend on fuel type and occupancy patterns, but most homeowners see heating costs drop to a fraction of previous levels.
Do I need to move out during the work?
For deep retrofits where the entire fabric is being upgraded, decanting temporarily is usually the better option, as the work is quicker and less disruptive that way. For phased or partial retrofits, staying in occupation is usually possible — we confirm this during the feasibility stage.
What planning permissions are needed?
Most retrofits affecting external appearance, listed buildings or conservation areas require planning permission, and most extensions and fabric upgrades need Building Regulations approval; we confirm which parts of your project are notifiable at survey. Drawings and applications are prepared by an independent architect, and APMBuild coordinates planning submissions and Building Control liaison. Where PAS 2035 applies, an accredited Retrofit Coordinator (a third party) leads it, and APMBuild follows its documentation discipline.
How long does a deep retrofit take?
We would expect an EnerPHit-route deep retrofit to run 4–8 months on site depending on size, complexity and whether the property is occupied. The design and PHPP modelling phase usually adds 6–10 weeks before work begins.
Is there a warranty on the work?
Every APMBuild project comes with a 24-month workmanship warranty, alongside the manufacturer warranties on installed products (windows, MVHR, insulation systems). We also provide post-completion airtightness and ventilation commissioning data.