Free tools for Irish homeowners
Retrofit calculators & tools
Work out your grants, costs, savings and system sizes before talking to a contractor. All free, no sign-up, instant results.
SEAI Grant Calculator Ireland 2026
Check exactly which SEAI grants apply to your home. Enter your property type, build year and planned upgrades to see your grant amounts instantly.
Check my grants →How Many Solar Panels Do I Need?
Enter your electricity usage, county and roof details. See the recommended system size, number of panels, annual generation and savings for your Irish home.
Size my solar system →Heat Pump vs Gas Boiler Cost Comparison
Compare annual running costs of a heat pump against your current gas or oil boiler. See how much you could save each year and your CO2 reduction.
Compare heating costs →Retrofit ROI Calculator — BER Upgrade Savings
Calculate the return on investment for upgrading your BER rating. See estimated costs, annual savings, payback period and property value increase.
Calculate my ROI →Battery Sizing Calculator for Solar
Find the right battery size for your solar PV system. Based on your daily usage and how many hours of backup you want.
Size my battery →Solar Panel Upgrade Calculator
Already have solar panels? See how much more you could generate and save by upgrading to higher wattage panels.
Check upgrade savings →Home Energy Savings Estimator Ireland
Enter your BER rating, heating system and planned upgrades to estimate your annual energy savings.
Estimate my savings →Solar Suitability Checker Ireland
Find out if your roof is suitable for solar PV panels, what you could generate per year, and your potential export income.
Check my roof →Commercial Solar Grant Calculator (NDMG)
Check non-domestic microgen grants for businesses, farms, schools and community buildings. Grants up to €162,600.
Check commercial grants →Retrofit Loan Comparison
Compare the 3% Home Energy Upgrade Loan Scheme with credit union and standard bank loans. See monthly repayments and total interest.
Compare loan options →BER Improvement Planner
Plan your upgrade path to reach your target BER rating. See recommended measures, costs, grants and the most cost-effective route.
Plan my BER upgrade →SEAI Grant Waiting Times
See current estimated SEAI grant processing times. Crowdsourced from real Irish homeowners who have been through the process.
Check waiting times →Want a personalised assessment?
Answer a few questions about your home and get a tailored grant breakdown, cost estimate and matched contractors.
Start my home checkCommon questions about our calculators
Are these calculators accurate?
They use current 2026 SEAI grant rates and cost estimates based on typical Irish retrofit projects. Results are estimates — a BER assessor and contractor quotes will confirm exact figures for your home.
Do I need to sign up?
No. All calculators are completely free with no sign-up required. You can optionally save your results or get matched with contractors after seeing your estimates.
Which calculator should I use first?
Start with the SEAI Grant Calculator to see what grants you qualify for. Then use the specific calculators for the upgrades you are considering — solar sizing, heat pump comparison, or retrofit ROI.
Can I trust the grant amounts shown?
Grant amounts are sourced directly from SEAI published rates for 2026. Actual eligibility depends on your property specifics, which a BER assessment will confirm.
Do the solar calculators use Irish data?
Yes. Solar yield figures are based on county-level Irish irradiance data, with adjustments for roof orientation (south, east/west, north) and tilt angle.
Related pages
Last verified: 2026-06-01