In the UK, U-values and R-values describe heat performance but from opposite angles. A U-value (W/m²K) measures how much heat passes through a building element; lower is better and it is central to Building Regulations. An R-value (m²K/W) measures how strongly a material resists heat flow; higher is better and it is common on insulation […]
A room-by-room heat loss calculation is a systematic way to work out how much heat each individual room in a UK home loses in winter. It uses room dimensions, construction details, window and door types, and location to set indoor/outdoor design temperatures. Heat loss through walls, floors, ceilings, and openings is calculated, along with ventilation […]
How is heat loss calculated in a house? A heat loss calculation for a UK house assesses how much heat escapes through walls, roof, floors, windows, doors and ventilation under standard winter conditions. It uses room dimensions, construction type, insulation levels, glazing performance, air‑tightness, and typical UK indoor and outdoor design temperatures. Fabric losses and […]
How to retrofit a Victorian house? Retrofitting a Victorian house in the UK starts with a full assessment of its fabric, damp risks, and services, then tackling heat loss at the roof, floors, and solid walls. Owners typically improve loft and floor insulation, seal draughts, upgrade or restore sash windows, and then resize heating systems, […]
After insulation, homes often become warmer and more airtight, so everyday moisture from cooking, bathing and drying clothes has fewer escape routes. This humid air then condenses on any remaining cold spots, such as poorly insulated corners, window reveals or hidden cold bridges, leading to damp patches, mould and musty smells. Good ventilation, correct installation, […]
Retrofitting older UK homes often fails when modern upgrades ignore traditional breathable construction. Common retrofit mistakes in older homes include adding insulation without evaluating moisture paths, sealing the building without balanced ventilation, and using one-size-fits-all measures that trap damp and cause mould or decay. Poor sequencing, overlooking existing defects, and not following PAS 2035 can […]
What does a retrofit coordinator do? A Retrofit Coordinator under PAS 2035 is an independent professional who oversees domestic energy efficiency upgrades from assessment to handover. They review surveys, develop a whole‑house retrofit plan, and guarantee measures are compatible with the building and occupant needs. They manage risks such as moisture and ventilation, coordinate designers […]
When is a retrofit coordinator required? A Retrofit Coordinator is required under PAS 2035 in the UK when domestic energy-efficiency works are carried out under regulated or government-backed funding, such as ECO or local authority schemes, especially where multiple or interacting measures are planned. They are typically mandatory for social housing and higher-risk homes or […]
Retrofit Coordinator vs Retrofit Assessor: In the UK, a Retrofit Assessor surveys an existing home, collecting detailed data on energy performance, building fabric, heating, moisture and ventilation risks. Their outputs include EPC/RdSAP or SAP data and a structured survey report. A Retrofit Coordinator then interprets this information to design, manage and sign off a safe, […]
What is PAS 2035 retrofit? PAS 2035 retrofit is the UK’s official standard for planning and managing energy efficiency upgrades in existing homes. It sets out a whole-house process, from initial assessment through design, installation and monitoring, to avoid issues like damp or poor ventilation. The standard defines key roles, risk pathways and documentation requirements […]
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