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Last updated: 3 June 2024

How Does a Green Mortgage Work? A Comprehensive Guide

The benefits of green mortgages for sustainable homeownership.

Green mortgage is gaining popularity as a smart way to finance eco-friendly homes. The concept is that a financial product is designed specifically for homeowners to invest in energy-efficient properties or make eco-friendly improvements to their existing homes.

By focusing on features such as solar panels, insulation, heat pumps, and energy performance certificates (EPCs), a green mortgage aims to promote homes that contribute less to carbon emissions and more to achieving net zero targets.

By doing so, they reduce their carbon footprint and save money on utility bills in the long run.

In the United Kingdom, the green mortgage market has witnessed significant growth recently, with major lenders such as Nationwide, Barclays, and NatWest offering specialised products. According to industry estimates, the UK green mortgage market is projected to reach £1.2 billion by 2025, driven by increasing consumer awareness and government initiatives to promote energy efficiency.

Let's delve into this comprehensive guide, exploring the practical steps to secure a green mortgage. By understanding these elements, you'll be better equipped to assess whether a green mortgage aligns with your home buying or improvement goals and how it can contribute to a sustainable future.

Facts about green mortgage
  • Green mortgages offer lower interest rates, cash back incentives, and reduced utility bills, making them financially attractive for homeowners.
  • To qualify for a green mortgage, properties typically need a high Energy Performance Certificate (EPC) rating, often A or B, or must undergo energy-efficient improvements.
  • The green mortgage market is expanding rapidly, with increasing product offerings and innovations to make energy-efficient homes more accessible and financially viable. 
  • Green mortgages promote sustainable living by incentivising energy-efficient home purchases and renovations, contributing to reduced carbon emissions and supporting climate goals.


What is a Green Mortgage?

A green mortgage is also an energy-efficient (EEM) or sustainable mortgage. This loan product is designed to encourage purchasing or renovating energy-efficient properties. For instance, installing solar panels or a heat pump can reduce heating costs by up to 50%.

These mortgages often come with lower interest rates, cashback incentives, and higher borrowing limits, making eco-friendly homes more accessible and affordable.

Originating from the desire to support environmental sustainability, the concept of green mortgages was influenced by the BUILD UPON project, which aimed at renovating Europe's buildings to meet higher energy standards. This initiative was further supported by the European Mortgage Federation, reflecting a growing trend towards eco-conscious financing. 

For homeowners, the benefits of a green mortgage are twofold. Firstly, they can save thousands of pounds over the lifetime of their mortgage through reduced interest rates or cashback offers. Secondly, living in an energy-efficient home can significantly reduce their monthly utility bills, contributing to long-term cost savings.

RegionGreen Mortgage Market Size (2023)Projected Growth (2023-2028)
North America£2.1 billion14.2% CAGR
Europe£1.8 billion16.7% CAGR
Asia-Pacific£1.3 billion18.5% CAGR
Rest of the World£0.9 billion12.8% CAGR

According to industry estimates, the UK green mortgage market is projected to reach £1.2 billion by 2025, driven by increasing consumer awareness and government initiatives to promote energy efficiency.

To qualify for a green mortgage in the UK, homeowners typically need to meet specific criteria set by lenders. This often includes having an Energy Performance Certificate (EPC) rating of A or B, which indicates a highly energy-efficient property. Alternatively, some lenders may offer green mortgages to borrowers who commit to making significant energy-efficient home improvements, such as installing solar panels or upgrading insulation.

Difference Between Traditional and Green Mortgages

Green mortgages differ from traditional mortgages primarily in their focus on energy efficiency. While both types of mortgages involve borrowing money to purchase or refinance a home, green mortgages benefit properties that meet specific energy performance criteria. 

These incentives are offered because properties meeting specific environmental standards are considered lower-risk investments for lenders. Green buildings typically have lower utility costs and potentially higher resale values, which can improve the loan-to-value ratio—a key consideration for financial institutions.

These benefits can include:

Advantages for Homeowners

  • Lower Interest Rates: Many lenders offer lower interest rates for green mortgages, making them more affordable. These reduced rates can make monthly repayments more affordable and save borrowers money over the life of the loan. For example, some green mortgages can be up to 0.11% cheaper than standard mortgages. 
  • Energy Efficiency Savings: Homes with energy-efficient features can significantly reduce utility bills. Green buildings cost less to run due to decreased utility bills. Furthermore, having lower energy bills also has a financial benefit, as lenders may offer more flexibility when it comes to affordability because they know your energy bills are likely to be lower. 
  • Increased Property Value: Energy-efficient homes often have higher resale values, making them a good investment. A Rightmove study of 200,000 homes found that owners who upgraded their homes from an F to C saw the value rise by an average of 16%. Similarly, moving from an E to C added an average of 8%, and moving from a D to C added 4%. 

Environmental Impact

  • Reducing Carbon Footprint: Green mortgages support the construction of eco-friendly homes, reducing overall carbon emissions.
  • Encouraging Sustainable Practices: They promote using sustainable materials and energy-efficient technologies in home building and renovations.

In contrast, traditional mortgages do not offer these specific incentives for energy efficiency. However, it's important to note that while green mortgage rates might be lower than the lender's standard rates, they are not always the most competitive in the broader market. 

Green Mortgages - Global vs. UK Perspective

MetricGlobal AverageUK Average
Average Interest Rate Reduction0.75%0.80%
Annual Savings (GBP)£1,200£1,300
Energy Efficiency RequirementEPC A/BEPC A/B
Government IncentivesVariesGreen Homes Grant
Percentage of Green Mortgages10%12%

Types of Green Mortgages

The incentives vary across lenders, but generally, getting discounts makes energy-efficient purchases or retrofits more affordable for homeowners and buyers.

Here are the various Green Mortgage Options:

  • Energy Efficient Mortgages (EEMs): These are designed for homes with existing or planned energy-efficient improvements. For instance, Nationwide's Green Additional Borrowing lets you borrow £5,000-£15,000 at 0% interest for renovations.
  • Green Home Mortgages (EPC-Rated): Tailored for purchasing new eco-friendly homes built with sustainable materials. Barclays offers preferential rates if you buy a new-build property directly from a builder with an EPC rating of 81 or above (A or B). while NatWest offers reduced rates if you purchase or remortgage a home with an EPC rating of A or B, up to 85% loan-to-value.
  • Renovation Green Mortgages: For homeowners looking to upgrade their current property with energy-efficient features like insulation, solar panels, or heat pumps. For example, Barclays' Greener Home Reward offers up to £2,000 cashback for existing mortgage holders making green improvements. The same goes for Virgin Money, which gives £250 cashback to existing mortgage holders borrowing additional funds for green renovations over £2,500. 
An eco-friendly home with solar panels and lush greenery, symbolising the benefits of a green mortgage in promoting sustainable living and energy efficiency.

How Does a Green Mortgage Work?

A green mortgage works similarly to a traditional mortgage but includes additional criteria related to the property's energy efficiency. The eligibility extends to purchases of new-build homes and renovations to improve energy efficiency, such as installing sustainable heating systems or better insulation.

  • For New Purchases: Borrowers can obtain a green mortgage when buying a new-build or an existing property that meets the required energy efficiency standards.
  • For Home Improvements: Borrowers can also use green mortgages to finance energy-efficient upgrades, such as installing solar panels, improving insulation, or upgrading heating systems. The cost of these improvements can be included in the mortgage, often at the same interest rate as the primary loan. 

The process of obtaining a green mortgage is similar to that of a traditional mortgage, with the added requirement of providing documentation to demonstrate the energy efficiency of the property or the planned renovations. Certifications like LEED or ENERGY STAR can make you eligible for a green mortgage. Lenders may also conduct their assessments to verify the property's energy performance.

Here’s a step-by-step overview:

  1. Property Qualification: The property must have a high Energy Performance Certificate (EPC) rating, typically A or B, or the homeowner must commit to making energy-efficient improvements.
  2. Application Process: The borrower applies for the mortgage, providing standard financial information and proof of the property’s energy efficiency.
  3. Incentives: If the property qualifies, the lender offers incentives such as lower interest rates or cashback.
  4. Energy Improvements: For existing homes, the borrower may need to complete energy-efficient upgrades within a specified timeframe to maintain the mortgage benefits.

For homeowners interested in securing a green mortgage, it is crucial to verify that their property meets the necessary EPC ratings or to plan renovations to elevate their home's energy performance. This not only helps in qualifying for the mortgage but also contributes to long-term savings and environmental sustainability.

Qualifying for a Green Mortgage

To qualify for a green mortgage, the primary requirement is obtaining an Energy Performance Certificate (EPC) with a rating of A or B. An EPC measures the energy efficiency of a property, assigning a rating from A (most efficient) to G (least efficient).

Here’s a comprehensive guide on how to qualify for a green mortgage.

High Energy Performance Certificate (EPC) Rating

The primary requirement for a green mortgage is a high Energy Performance Certificate (EPC) rating. Most lenders require an EPC rating of A or B, though some may accept a C rating. These properties are designed with energy efficiency in mind, featuring elements like high insulation levels and A-rated appliances, which help reduce energy consumption and carbon emissions. In contrast, older homes might require significant upgrades to meet the necessary EPC ratings, which can be costly.

  • EPC Rating: A, B, or occasionally C
  • Improvements: Insulation, double-glazing, energy-efficient heating systems, renewable energy sources like solar panels

Standard Mortgage Affordability Criteria

In addition to the EPC rating, you must meet the standard mortgage affordability criteria. This includes demonstrating creditworthiness, stable income, and employment stability. Lenders will assess your financial situation just like a conventional mortgage.

  • Creditworthiness: Good credit score
  • Income: Stable and sufficient to cover mortgage repayments
  • Employment: Stable job history

Weighing the Pros and Cons

While it offers benefits like lower interest rates and cashback for properties with high EPC ratings, they are not without drawbacks. The rates offered may only sometimes be the most competitive on the market, and the choice of lenders offering green mortgages can be limited. 

Lender-Specific Criteria

Different lenders have specific requirements for green mortgages. Lenders like NatWest and Barclays offer incentives for properties with high EPC ratings, and Nationwide provides cashback for exceptionally high ratings.

Examples of Green Mortgages:

  • NatWest Green Mortgage: Offers a preferential interest rate for properties with an EPC rating of A or B. The maximum loan-to-value (LTV) is 85% for residential properties.
  • Barclays Green Home Mortgage: Provides a lower mortgage rate for new-build properties with an EPC rating of A or B, purchased directly from a builder or developer.
  • Nationwide Green Mortgage: Offers £500 cashback for properties with an EPC rating of A or £250 for B-rated properties. Additionally, it provides interest-free borrowing for green home improvements.

Examples of Non-Green Mortgages

Non-green mortgages do not specifically target energy efficiency but can still offer competitive rates and terms. Here are some examples:

  1. HSBC Fixed-Rate Mortgage: A two-year fixed rate of 4.79% and a five-year fixed rate of 4.93% for residential properties.
  2. Leeds Building Society Fixed-Rate Mortgage: Provides a two-year fixed rate at 4.74% and a five-year fixed rate at 4.99% for residential properties.
  3. Barclays Fixed-Rate Mortgage: Offers a two-year fixed rate at 4.99% for purchase-only mortgages.

It is essential for potential borrowers to research and compare different green mortgage products to find the best fit for their financial and environmental goals. 

Key Differences Between Green and Non-Green Mortgages

Here are the critical differences between green and non-green mortgages:

FeatureGreen MortgagesNon-Green Mortgages
Interest RatesLower rates for energy-efficient propertiesStandard rates based on financial criteria and LTV
Financial IncentivesCashback, reduced feesNone specific to energy efficiency 
Eligibility CriteriaHigh EPC rating (A or B, sometimes C)Standard creditworthiness and income requirements
Long-Term SavingsSavings on utility bills due to energy efficiencyNo specific savings related to energy efficiency
PurposePurchase or improve energy-efficient homesPurchase or refinance homes
Environmental ImpactReduces carbon footprint, promotes sustainabilityNo specific environmental focus
Property ValueHigher value for energy-efficient homesValue-based on general market conditions

Tips to Save on Mortgages: Green vs Non-Green Options

In the current UK mortgage market, there are various ways to save on your mortgage, whether you opt for a green mortgage or a traditional non-green mortgage. Green mortgages are designed to incentivise purchasing or remortgaging energy-efficient homes, often offering lower interest rates or cashback rewards. 

However, comparing these with non-green mortgage options ensures you get the best deal.

  1. Compare Rates: Always compare different mortgage products' interest rates and terms. Use online comparison tools and consult mortgage brokers to find the best deals.
  2. Check Eligibility: Ensure you meet the eligibility criteria for green mortgages, such as having a high EPC rating. This can unlock lower rates and additional benefits.
  3. Consider Green Mortgages: Green mortgages offer lower rates for energy-efficient homes. For example, NatWest and Barclays provide preferential rates for properties with an Energy Performance Certificate (EPC) rating of A or B.
  4. Consider Cashback Offers: Some lenders offer cashback for purchasing energy-efficient homes or making green improvements. This can offset some of the initial costs. For example, Nationwide offers £500 cashback for properties with an EPC rating of A and £250 for a rating of B. 
  5. Plan for the Long Term: Fixed-rate mortgages provide stability in monthly payments, which can be beneficial in a fluctuating interest rate environment. However, consider the overall cost, including any early repayment charges.
  6. Check for Fees: Some mortgages come with arrangement fees that can offset the benefits of a lower rate. Always calculate the total cost of the mortgage, including fees.
  7. Consult a Mortgage Broker: A mortgage broker can help you navigate the various options and find the best deal tailored to your financial situation and property type.

The mortgage market in the UK offers a variety of choices, including green mortgages that reward energy-efficient properties. But are they always the cheapest option?

Here's a comparison of some current green and non-green two-year fixed mortgage rates in the UK:

LenderGreen Mortgage RateNon-Green Mortgage RateIncentiveEPC Rating Requirement
NatWest4.39%4.64%Lower arrangement feeA or B
Barclays4.48%4.73%Free valuation, £250 -  £2,000 cashbackA or B (new-build)
Nationwide4.59%4.59%£250 - £500 cashback for green mortgagesA or B
HSBC4.79%4.79%Standard productA or B
Lloyds Bank4.83%4.83%Standard productA or B

As you can see, green mortgage rates are generally lower than their non-green counterparts, with some lenders offering cashback incentives for energy-efficient properties. The savings can be significant over the life of the mortgage, especially for larger loan amounts.

Let's consider two examples to illustrate the potential savings with green mortgages:

  1. NatWest Green Mortgage: For a £200,000 mortgage over 25 years, the green mortgage rate of 4.39% would result in monthly payments of £1,098, while the non-green rate of 4.64% would lead to monthly payments of £1,132. Over the two-year fixed period, the green mortgage would save you £816 in interest payments.
  2. Nationwide Green Mortgage: If you're purchasing a property with an EPC rating of A or B, you could qualify for a £500 cashback with Nationwide's green mortgage. This upfront incentive can help offset closing costs or be used for energy-efficient home improvements.

It's important to note that mortgage rates are subject to change, and the specific terms and conditions may vary among lenders. Additionally, while green mortgages can provide financial incentives, they are not inherently "green" regarding the lender's investment practices or environmental impact.

Here, let's look at cheap green and non-green two-year Fixed mortgages on a £300,000 property. A comparison of some of the cheapest green and non-green two-year fixed-rate mortgages on property. 

This table includes the loan-to-value (LTV) ratio, interest rates, set-up fees, monthly payments, and the total cost over two years.

LenderTypeLTVInitial RateAPRCMonthly PaymentTotal Cost Over 2 YearsAdditional Benefits
BarclaysGreen75%4.45%6.99%£1,250£30,000Lower rate for energy-efficient homes 
NatWestGreen85%4.53%6.1%£1,275£30,600Discounted rate for EPC A or B properties 
Clydesdale BankNon-Green90%5.19%8.9%£1,350£32,400Standard two-year fixed rate 
Leeds Building SocietyNon-Green70%4.74%7.6%£1,300£31,200Standard two-year fixed rate 
HSBCNon-Green85%5.79%7.0%£1,400£33,600Standard two-year fixed rate 

Note: The rate is as of May 2024; the average rates for two-year fixed mortgages vary depending on the loan-to-value (LTV) ratio.

Financial Cost vs Saving Analysis

Green mortgages offer a compelling financial proposition despite higher initial costs. The long-term savings on utility bills, potential rebates, and increased property value make them a worthwhile investment.

  1. Initial Cost: Green mortgages often come with higher upfront costs. These costs are primarily due to the energy-efficient upgrades required to qualify for such a mortgage. For instance, installing solar panels, upgrading insulation, or replacing old heating systems can be expensive.
  2. Long-term Savings: Despite the higher initial costs, green mortgages can lead to substantial long-term savings. Additionally, many green mortgages offer rebates and incentives that can further offset the initial costs. For example, some lenders provide cashback or lower interest rates for properties with high energy efficiency ratings (EPC ratings of A or B) up to £2,000 annual savings on energy costs.
  3. ROI on Green Investments: Investing in energy-efficient features can yield significant returns. The savings on utility bills over time can be substantial. For example, a homeowner might save up to £2,000 annually on energy costs, translating to £60,000 over a 30-year mortgage period. 

How to Apply for a Green Mortgage

Steps to Apply

  1. Assess Your Property's Energy Efficiency: Obtain an Energy Performance Certificate (EPC) for your property. Most lenders require an EPC rating of A or B.
  2. Research Lenders and Their Criteria: Different lenders have varying requirements and benefits. For example, NatWest offers lower rates for properties with an EPC rating of A or B, up to a maximum loan-to-value (LTV) of 85%. Barclays requires the property to be a new-build with an EPC rating of A or B.
  3. Make Necessary Home Improvements: If your property does not meet the required EPC rating, consider making energy-efficient upgrades such as installing better insulation, energy-efficient windows, or renewable energy sources like solar panels.
  4. Gather Required Documentation: Prepare all necessary documents, including your EPC, proof of income, and identification. Some lenders may also require a detailed plan of the energy-efficient improvements you intend to make.
  5. Apply for the Mortgage: Contact your chosen lender or a mortgage broker to start the application process. You may need to fill out specific forms and provide your EPC and other documentation.
  6. Review and Finalise the Offer: Review the mortgage offer carefully once your application is approved. Ensure you understand the terms, including any early repayment charges or conditions for maintaining the green mortgage rate.

The UK Regions with the Most Energy-Efficient Homes

  1. South East and London: Most energy-efficient areas with a score of 68, largely due to the prevalence of flats and new-builds.
  2. North East, South West, East of England: High energy efficiency scores of 67, close behind South East and London.
  3. West Midlands, East Midlands, North West: Scores of 66, indicating good energy efficiency but room for improvement.
  4. Wales and Yorkshire and the Humber: Least energy-efficient regions with scores of 65, highlighting the need for more energy efficiency improvements


The green mortgages represent a win-win situation for both homeowners and the environment. As of recent data, 57% of major UK lenders now offer green mortgage options, up by 4% from the previous year. The market has seen a significant increase in the number of green mortgage products available, with over 50 products now on the market. 

This represents a growing trend towards sustainable living. They offer financial benefits while supporting environmental goals. For future homebuyers, considering a green mortgage can be a wise and eco-friendly choice.

Moreover,  it allows borrowers to save money through lower interest rates or cashback incentives while promoting energy efficiency and sustainability in the housing market.

As the world prioritises sustainability, the popularity of these mortgages is expected to grow, driving a shift towards more housing options.

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