Free UK Energy & Renewables Calculators 2026
Solar PV installer margins, heat pump job profitability, BUS grant impact, EPC assessor pricing, ECO4 funded insulation, battery storage and small-scale renewables ROI — updated for 2025/26. Free to use, no account needed.
Solar PV Installer Job Margin
Calculate profit margin on a domestic or commercial solar PV installation including panels, inverter, scaffold and MCS certification.
ASHP Installer Margin Calculator
Work out net margin on an air source heat pump installation after BUS grant (£7,500) and material/labour costs.
GSHP Installer Margin Calculator
Calculate ground source heat pump job profitability including borehole, unit, cylinder and labour.
EV Charger Installer Day Rate Calculator
Establish a profitable day rate for EV charger installations based on complexity, OZEV scheme admin and overhead.
Battery Storage Installer Margin
Profit margin per battery storage installation — AC vs DC coupled, with and without solar.
EPC Assessor Pricing Calculator
Set profitable EPC assessment pricing based on property type, travel time and accreditation costs.
PAS 2035 Retrofit Coordinator Fee
Estimate your PAS 2035 retrofit coordinator fee for ECO4 and GBIS projects.
Insulation Installer Job Margin
Calculate margin on cavity wall, loft, underfloor or EWI insulation — ECO4 funded vs private.
Biomass Boiler Installer ROI
Estimate ROI from biomass boiler installations including BUS grant impact and fuel savings.
Micro-Hydro System ROI
Calculate return on investment for micro-hydro generation systems — flow rate, head and grid export income.
Small Wind Turbine ROI
Payback calculator for small-scale wind turbine installation — rated output, annual generation and SEG income.
UK Renewable Energy Sector 2025/26
The UK renewable energy installation sector is growing rapidly driven by the Boiler Upgrade Scheme (BUS), ECO4, the Smart Export Guarantee (SEG) and the Clean Heat Market Mechanism (CHMM) from 2025. These calculators help solar PV installers, heat pump contractors, EPC assessors, insulation installers and small-scale renewable developers quickly model job margins, grant impacts and ROI without specialist software.
Frequently Asked Questions
- What is the BUS grant for heat pumps in 2025/26?
- The Boiler Upgrade Scheme (BUS) provides £7,500 towards the cost of an air source heat pump or biomass boiler in England and Wales in 2025/26. The grant is paid to the MCS-certified installer, who reduces the customer price accordingly. The scheme is managed by Ofgem. Ground source heat pumps receive the same £7,500 grant.
- Is MCS certification required for solar PV installers?
- Yes. MCS (Microgeneration Certification Scheme) certification is required for solar PV installers who want their customers to access the Smart Export Guarantee (SEG) tariff, which pays for electricity exported to the grid. MCS certification is also required for heat pump and battery storage installers wanting to access BUS grants. MCS annual certification body fees typically cost £1,500–£3,000/year.
- What is the ECO4 scheme and when does it end?
- ECO4 (Energy Company Obligation 4) is a government scheme requiring large energy suppliers to fund energy efficiency improvements in low-income and fuel-poor households. Eligible measures include cavity wall insulation, loft insulation, external wall insulation (EWI), heat pumps and boiler replacements. ECO4 runs until March 2026, after which a successor scheme (ECO5 or GBIS extension) is expected. Installers working on ECO4 projects must be TrustMark registered and PAS 2030 certified.
- What is the Smart Export Guarantee (SEG) rate in 2025/26?
- The Smart Export Guarantee (SEG) requires licensed electricity suppliers with 150,000+ customers to offer export tariffs for small-scale renewable generators (up to 5MW). Rates vary by supplier — in 2025/26, typical SEG export rates range from 3p to 15p/kWh depending on the tariff (fixed vs dynamic/agile). Octopus Agile export can achieve higher rates at peak times. Installations must be MCS-certified to qualify.