Client overview
This case study covers the retrofit of a top-floor flat at Anchor Yard, Bridlington, which started out with a very poor F-rated Energy Performance Certificate. Through the installation of an air source heat pump and a rooftop solar PV system, the property achieved a significant improvement to an EPC rating of B, with estimated annual savings of almost £300 — illustrating how top-floor flats, which often face particular heat loss and heating challenges, can be transformed through a combined renewable heating and generation approach.
The challenge
Top-floor flats are typically exposed to greater heat loss through the roof than properties elsewhere in a building, often relying on ageing or inefficient heating systems that push running costs up further. Starting from an F-rated EPC, this property faced high heating costs, poor thermal performance, and a heating system in need of replacement. The objective was to install a more efficient heating solution alongside renewable generation, delivering a meaningful uplift in EPC rating and a tangible reduction in the occupant's annual energy costs.
Project goals
Improve the EPC rating
Starting from an F-rated EPC, deliver a meaningful, measurable uplift in the property's energy performance certificate.
Tackle roof heat loss
Address the greater heat loss top-floor flats face through the roof compared to properties elsewhere in the building.
Cut heating costs
Replace an ageing, inefficient heating system with one suited to a top-floor flat's specific demands.
The solution
Ideal Logic Air heat pump
An 8kW Ideal Logic Air heat pump with a 210L pre-plumbed cylinder was installed to replace the property's existing heating system, delivering efficient space and water heating suited to a top-floor flat.
Multi-array solar PV system
A 4.05kW solar PV system was fitted across two arrays totalling 9 panels, positioned to make the best use of the available roof space and maximise renewable electricity generation.
Combined heating and generation
The two technologies were designed together — on-site solar generation offsets consumption from the new heat pump and the wider household, reducing reliance on costly heating and grid electricity.
Results & benefits
EPC improvement
The property's EPC rating rose from F to B — a substantial improvement reflecting the scale of the upgrade delivered.
Annual savings
The works are estimated to save the occupant almost £300 a year on energy bills, a meaningful and ongoing reduction in running costs for a property that started from one of the lowest EPC bands.
Reduced heating costs
The Ideal Logic Air heat pump replaced an ageing, inefficient heating system, delivering efficient space and water heating suited to a top-floor flat.
Renewable generation
The 4.05kW solar PV system across two arrays offsets consumption from the new heat pump and the wider household, cutting reliance on grid electricity.
“This Bridlington top-floor flat shows how a modern air source heat pump paired with a well-designed multi-array solar PV system can transform the efficiency of even the most exposed and challenging property types. Moving from an EPC rating of F to B, with estimated annual savings of almost £300, demonstrates a clear and achievable path for similar top-floor flats seeking to reduce both their energy costs and their environmental impact.”
YEERS Project Summary, Anchor Yard, Bridlington
