GBIS Calculator – Eligibility Checker
GBIS Calculator
Check your property eligibility and estimate your Partial Project Score.
Quick property check
Measure and scoring inputs
Calculation Results
Review your eligibility and estimated scoring below.
⚠ Exact matrix data for this combination is unavailable in our estimate database.
Provide exact EPC, Council Tax, and SAP data for higher precision.
How this GBIS Calculator helps
Not sure whether your home could qualify for insulation support or what your GBIS score might mean? This calculator helps you make a quick, practical first check before you speak to a supplier or installer.
We know that navigating government schemes can be overwhelming. By entering your property details—such as your EPC rating, Council Tax band, and the type of insulation you need—we evaluate your eligibility signals. The tool then cross-references your inputs against the official Ofgem GBIS scores matrix to provide an estimated Partial Project Score (PPS) and personalised next steps.
How the GBIS Process Works
1. Estimate
Use this calculator to check basic eligibility.
2. Assessment
A qualified Retrofit Assessor visits your home.
3. Supplier
Energy supplier reviews the assessment & costs.
4. Install
A TrustMark installer completes the work.
Eligibility Routes at a Glance
| Route | EPC Requirement | Council Tax Band | Household Criteria |
|---|---|---|---|
| General Group (England) | D, E, F, or G | A, B, C, or D | No specific income limit |
| General Group (Wales & Scotland) | D, E, F, or G | A, B, C, D, or E | No specific income limit |
| Low-Income Group | D, E, F, or G | Any Band | Qualifying benefits or LA Flex referral |
What the Great British Insulation Scheme checks
Before any insulation measure is approved, the scheme mandates checks across a few critical areas:
- EPC rating: To ensure the property actually needs energy efficiency improvements, typically bands D to G.
- Council Tax band: Used to filter properties into the general eligibility group.
- Household circumstances: Determining whether you meet the criteria for the low-income group, receive qualifying benefits, or can be supported via Local Authority Flex.
- Property suitability: A certified retrofit assessment must confirm that the insulation measure is technically suitable for your building.
Ultimately, an obligated energy supplier will make the final decision based on their funding caps and current operational capacity.
What your GBIS score means
Your estimated GBIS score gives you an idea of the energy savings your projected measure might generate. However, it is vital to understand that a high Partial Project Score (PPS) is not the same as guaranteed cash in your pocket.
The funding estimate we provide depends entirely on the £/ABS rate inputted, which fluctuates between suppliers and installers. Some measures may be fully funded, while others might require a customer contribution to cover the total installation cost. An official retrofit assessor will confirm the final viable score.
Frequently asked questions
A GBIS Calculator is an estimation tool designed to help homeowners, tenants, and installers quickly check if a property might be eligible for the Great British Insulation Scheme. It provides a Partial Project Score (PPS) estimate based on available scoring data, helping you understand potential funding.
Anyone in England, Wales, or Scotland can use it. It is particularly useful for homeowners, private renters with landlord permission, landlords, installers and Retrofit Assessors.
Not necessarily. Your GBIS score estimates the potential value of the insulation to a supplier. Whether the insulation is completely free depends on the measure cost, supplier rate and any customer contribution required.
Generally, your property must have an Energy Performance Certificate rating of D, E, F, or G to be considered under the Great British Insulation Scheme.
For the general eligibility group, homes in England normally need Council Tax bands A to D. In Scotland and Wales, bands A to E may qualify.
Yes, tenants may be able to use the scheme, but landlord or property-owner permission is required before assessment or installation work can proceed.
£/ABS means the funding rate per Annual Bill Savings. Entering a rate helps estimate a rough funding value from the calculated score.
The calculator uses your inputs to estimate a score. A formal retrofit assessment is needed to verify exact measurements, SAP data and property conditions.