4 Broadway Croft — ECO4 Full Retrofit & Solar PV
Semi-Detached · Oldbury, West Midlands · B68 9DJ
EPC Improvement
Before
SAP 2
After
SAP 78
Project Details
Property Type
Semi-Detached House
Construction
Solid Wall (1900–1929)
Location
Oldbury, West Midlands B68 9DJ
Client
Private Tenant — Mohammed, Oldbury
Funding
ECO4
Floor Area
63 m²
Measures Installed
Solar PV
2.25kW — 5 × Black Monocrystalline Panels, Fox Inverter
Internal Wall Insulation
SWIP IWI — Knauf Mineral Wool + Intello VCL
Loft Insulation
Knauf Loft Roll 44 — 300mm Total Depth
Electric Storage Heating
ESH — Elnur Gabarron High-Retention Heaters
Ventilation
DMEV — Demand-Controlled Mechanical Extract
Much warmer.
— Mohammed, Oldbury
Project Overview
4 Broadway Croft is a solid-wall semi-detached house in Oldbury, West Midlands, built between 1900 and 1929. Prior to works, the property had no insulation, no renewable energy, and relied entirely on direct-acting electric heating — resulting in an EPC G rating (SAP 2) and annual energy costs of £3,105.
Under the ECO4 scheme, EmberSol delivered a comprehensive five-measure retrofit in November 2025: a 2.25kW Solar PV system (5 black monocrystalline panels with Fox inverter, MCS certified), SWIP IWI with Knauf mineral wool batts and Intello intelligent VCL across all external walls, Knauf Loft Roll 44 to 300mm, Elnur Gabarron high-retention electric storage heaters, and a DMEV ventilation system.
The post-works EPC assessment confirmed a rating of C (SAP 78) — a 76-point SAP uplift from G to C, reducing estimated annual energy costs from £3,105 to £1,341 and delivering estimated annual savings of £138. Retrofit Coordinator: Vrindara Chopra. C2 inspection by SWIP. C3 inspection by Tecnika. TrustMark lodgement completed.
Technical Specification
| Property | 4 Broadway Croft, Oldbury, West Midlands B68 9DJ |
| Property Type | Semi-Detached, Solid Wall (1900–1929) |
| Floor Area | 63 m² |
| Funding | ECO4 |
| Pre-Works EPC | G — SAP 2 |
| Post-Works EPC | C — SAP 78 |
| SAP Uplift | +76 points |
| Annual Cost Before | £3,105/yr |
| Annual Cost After | £1,341/yr |
| Annual Saving | £138/yr |
| Solar PV System | 2.25kW — 5 × Black Monocrystalline Panels |
| Inverter | Fox Solar Inverter with DC & AC Isolators |
| Wall Insulation | SWIP IWI — Knauf Mineral Wool + Intello Intelligent VCL |
| Loft Insulation | Knauf Loft Roll 44 — 300mm Total Depth |
| Heating | Elnur Gabarron ESH — High-Retention Electric Storage Heaters |
| Ventilation | DMEV — Demand-Controlled Mechanical Extract Ventilation |
| Standards | MCS, PAS 2030, PAS 2035, TrustMark Lodged |
| Retrofit Coordinator | Vrindara Chopra |
| C2 Inspection | SWIP |
| C3 Inspection | Tecnika |
| Works Completed | November 2025 |