Modern Methods of Construction (MMC) are becoming increasingly popular across the UK housing sector. In 2025, MMC was used in around 24% of new-build residential projects, up from 18% the previous year. MMC homes can also be delivered 30–40% faster than traditional construction methods and may achieve 20–25% lower embodied carbon emissions whilst reducing construction waste.

As more homeowners look to build and live differently, Ecology continues to support homes that fall outside the mainstream.

Not all lenders are comfortable lending on homes built using innovative or sustainable construction methods. At Ecology Building Society, we’re different.

Many environmentally conscious builders and homeowners choose construction methods that reduce waste, improve energy efficiency and lower the carbon footprint of their homes. As a specialist lender, we understand these approaches and have extensive experience lending on properties that some mainstream lenders may not accept.

We can consider homes built using:

• Standard Construction
• Timber frame
• Structural Insulated Panels (SIPs)
• Insulated Concrete Formwork (ICF)
• Hempcrete
• Straw bale
• Cross-Laminated Timber (CLT)
• Passivhaus construction
• Other Modern Methods of Construction (MMC)

To speak to our friendly mortgage advisors, you’ll need to provide your financial details to obtain a decision in principle. When you’re ready to fully apply, you’ll need to have a specific property in mind. When you’re ready to apply for the mortgage, we’ll ask you for:

• Income & expenditure documents
• Availability of your deposit
• A copy of the energy performance certificate for the property
• A copy of the build warranty or building certificate

The property must have a minimum EPC B (85) or higher to be eligible for this product. If the property is a new build and not yet fully completed, please provide a copy of the predicted energy assessment.

An EPC (Energy Performance Certificate) rating is a measurement of the energy efficiency of a building. It is typically required when selling or renting a property in many countries, including the UK. The rating is based on factors such as insulation, heating systems, and the overall energy use of the property.

The rating scale typically ranges from A (very efficient) to G (inefficient), with A being the best and G being the worst. A higher EPC rating indicates that the property is more energy-efficient, which can mean lower energy bills and a smaller environmental impact.

If the property is built in the last 10 years, the property must have an acceptable build warranty or a Professional Consultant’s Certificate, for any property constructed after the first 10 years period this is not required.

You will need a minimum deposit for a purchase of 20% or for a remortgage a minimum of 20% of equity remaining in the property.

For a purchase you can borrow up to 80% of the purchase price or valuation (whichever is lower), for a remortgage we can cover any secured lending on the property or any works to be spent on improving the property.

Yes, although we do offer a buy-to-let mortgage. Please bear in mind that we don’t offer mortgages for second homes, holiday homes or homes classed as mobile planning.

The mortgage is available for non-standard construction types (eg timber frame/clad) providing it complies with our ecological requirements of a minimum EPC B (85), buildings insurance can be obtained, and the valuer confirms the condition and marketability of the property are satisfactory.