16a Wynall Lane wollescote, DY9 9AB Case Study
Southall UB1 Boiler & Loft Insulation Upgrade | Home Upgrade Case Study Home / Case Studies / Allenby Road Boiler & Loft Upgrade Location Southall, UB1 Local Authority Ealing Council £893/year Estimated bill savings after the upgrade Boiler & Loft Insulation Upgrade This end‑terrace property in Southall UB1, under Ealing Council, was rated SAP 52 (EPC Band E) with high running costs and uneven room temperatures. An outdated Potterton Suprima boiler and an uninsulated loft were driving up energy use and increasing condensation risk. Simple Green Energy installed an Ideal Logic Combi2 boiler, modern heating controls and 300 mm of Knauf mineral wool insulation to cut wasted heat, stabilise comfort and reduce annual bills. Start your home upgrade today → Answer a few quick questions to receive a tailored boiler and insulation assessment for your home. Financial Impact £893 Estimated annual reduction in energy bills £6k–£12k Typical lifetime savings over boiler and insulation lifespan 2.79 t Tonnes of CO₂ saved each year compared with pre‑works £74+/mo Approximate monthly saving on combined gas and electricity Building Performance Property Location Southall, UB1 Local Authority Ealing Council Pre-Upgrade EPC Rating SAP 52 – EPC Band E Post-Upgrade EPC Rating SAP 69 – EPC Band C Annual Energy Bills Reduced from ~£2,393 to ~£1,500 per year Comfort & Air Quality Loft Insulation Upgrade Loft increased from 0 mm to 300 mm Knauf mineral wool Boiler Efficiency Improvement Old Potterton Suprima replaced with Ideal Logic Combi2 (89% efficiency) Heating Controls New time and temperature controls for better daily regulation Condensation Risk More even temperatures and consistent heating reduce cold‑spot driven condensation The Project Customer Background The homeowner in Southall UB1 was living in an inefficient end‑terrace with high running costs and uneven warmth between rooms. Pre‑works modelling showed a SAP score of 52 (EPC Band E) and estimated annual fuel bills of around £2,393. The existing Potterton Suprima boiler typically operated at only 65–70% efficiency and was prone to electrical faults, resulting in unreliable heating and unnecessary fuel consumption. In practical terms, the household was effectively losing around 30 pence of every £1 spent on gas, and the uninsulated loft allowed heat to escape rapidly, increasing the risk of cold surfaces, condensation and poor indoor air quality. Project Goals Lift the property from EPC Band E to a solid Band C performance. Reduce overall energy demand and lower annual running costs. Provide more stable, comfortable temperatures throughout the home. Replace the ageing boiler with a reliable, efficient Ideal Logic Combi2 system. Raise loft insulation levels to modern standards to cut roof‑level heat loss. Location Details Area: Southall, UB1 Local Authority: Ealing Council Property Type: End-terrace house Floor Area: Approx. 127 m² Construction Age: Main build 1900–1929 with later extensions Pre-Upgrade Rating: SAP 52, EPC Band E with high heat loss and high demand The Solution Simple Green Energy delivered a targeted upgrade that tackled the two main issues: poor heating efficiency and uncontrolled heat loss through the roof. The combination of a modern combi boiler, upgraded controls and 300 mm of loft insulation delivers lower bills, improved comfort and a much stronger EPC rating. Loft Insulation Upgrade From 0 mm to 300 mm insulation. The loft previously had no meaningful insulation, allowing substantial heat to escape through the roof. Installing 300 mm of Knauf mineral wool exceeded the 270 mm recommended standard, improving thermal retention and helping the home stay warm for longer between boiler cycles. Boiler Replacement Outdated boiler to Ideal Logic Combi2. The inefficient Potterton Suprima was replaced with an Ideal Logic Combi2 boiler, providing higher seasonal efficiency, improved reliability and instant hot water. This upgrade was a key driver in moving the EPC score from SAP 52 (Band E) to SAP 69 (Band C). Heating Controls Upgrade Smarter time and temperature control. New programmable time and temperature controls were fitted to give the household better control over when the heating runs and at what set‑points. This reduces wasted energy, supports more consistent temperatures and makes day‑to‑day operation easier to manage. Installation Approach Sequenced to minimise disruption. Works were delivered in a logical order: survey validation, loft insulation installation, boiler replacement and system commissioning. Final balancing and handover ensured the new equipment operated as designed and that the customer understood how to use the controls effectively. Materials & Equipment Modern, efficient components. The upgrade used high‑quality Knauf mineral wool loft insulation, an Ideal Logic Combi2 boiler and compatible heating controls. Together, these components provide robust performance, lower running costs and a more comfortable internal environment. How it works together: The loft insulation reduces heat loss through the roof so the home retains warmth for longer, while the Ideal Logic Combi2 boiler and modern controls deliver that heat more efficiently and only when needed. The result is a home that warms up quickly, stays comfortable for longer and costs less to run over each heating season. Before and After Bills Before upgrade EPC E · SAP 52 ~£2,393/year estimated energy costs ~6.07 tonnes CO₂ emissions per year After works EPC C · SAP 69 ~£1,500/year estimated energy costs ~3.28 tonnes CO₂ emissions per year Previous Annual Energy Costs (Before Upgrade) ~£2,393 New Annual Energy Costs (After Upgrade) ~£1,500 *Figures are based on energy performance modelling for this UB1 end‑terrace property. Actual savings will depend on occupancy patterns, thermostat settings and energy tariffs. Customer testimonial ” We noticed a clear improvement after the work was completed. The home feels warmer, the heating is more reliable, and the boiler responds much better. The loft insulation has also made the property feel less draughty and more comfortable overall. Southall Homeowner UB1 · Boiler & loft insulation upgrade Ready to improve your home’s efficiency? If your home is hard to heat or your bills have risen sharply, a boiler and loft insulation upgrade could make a measurable difference. Simple Green Energy can assess your property and recommend the most effective measures for comfort, cost and carbon savings. Get your free home assessment
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