What are "primary" vs "secondary" measures in the context of grants?

Understanding Energy Efficiency: What Are “Primary” vs “Secondary” Measures in the Context of Grants?

If you are looking to improve the energy efficiency of your property in the UK, you may have come across the terms “primary” and “secondary” measures. These terms are frequently used by government-backed initiatives, such as the Energy Company Obligation (ECO4) or previous schemes like the Green Homes Grant. Understanding the distinction between these two categories is essential for anyone hoping to secure financial assistance for home improvements.

The core logic behind this classification is to encourage a “fabric first” approach. This means the government prioritises measures that have the most significant impact on heat retention and carbon reduction before funding smaller, incremental improvements. By focusing on the structural efficiency of a building first, the UK aims to reach its net-zero targets more effectively.

The Definition of Primary Measures

Primary measures are the heavy lifters of home energy efficiency. These are improvements that either significantly reduce the amount of heat escaping from a building or change the way heat is generated using low-carbon technology. In most grant frameworks, you cannot receive funding for smaller projects without first committing to at least one primary measure.

Primary measures are generally split into two main categories: insulation and low-carbon heating. Because these projects often require a higher initial investment and provide the largest long-term energy savings, they are treated as the foundation of any retrofit project.

Insulation as a Primary Measure

Insulation is often the most cost-effective way to improve a property’s Energy Performance Certificate (EPC) rating. Common primary insulation measures include:

• Solid Wall Insulation: This can be applied internally or externally and is typically used for older properties built before the 1920s that do not have cavity walls.
• Cavity Wall Insulation: Filling the gap between the inner and outer leaf of a wall with insulating material.
• Under-floor Insulation: Specifically for suspended timber floors or ground-floor slabs.
• Loft or Roof Insulation: This includes insulating the rafters or the floor of the loft space to prevent heat from rising out of the building.
• Park Home Insulation: Specialized insulation for the walls and floors of mobile or park homes.

Low-Carbon Heating as a Primary Measure

If a property is already well-insulated, the next step in the primary category is often the installation of low-carbon heating systems. These replace traditional gas or oil boilers. Examples include:

• Air Source Heat Pumps: These units extract heat from the outside air to provide heating and hot water.
• Ground Source Heat Pumps: These use pipes buried in the garden to extract heat from the ground.
• Solar Thermal: Using solar panels to heat water directly.
• Biomass Boilers: Heating systems that burn organic materials like wood pellets.

The Definition of Secondary Measures

Secondary measures are supplementary improvements. While they do contribute to energy efficiency and comfort, their impact is generally considered smaller than that of primary measures. Most grant schemes stipulate that you can only apply for a secondary measure if you have already installed (or are currently installing) a primary measure.

Furthermore, there is often a financial cap involved. In many historical and current frameworks, the amount of money you receive for a secondary measure cannot exceed the amount of the subsidy provided for the primary measure. For example, if your loft insulation (primary) costs £600, your grant for draught proofing (secondary) might also be capped at £600.

Common Secondary Measures

• Draught Proofing: Sealing gaps around windows, doors, and floorboards to prevent cold air from entering.
• Double or Triple Glazing: Replacing older, single-glazed windows with energy-efficient units. Note that grants rarely cover replacing existing double glazing with newer double glazing.
• Energy-Efficient Doors: Replacing older doors (installed before 2002) with modern, insulated versions.
• Heating Controls and Thermostats: This includes smart thermostats, thermostatic radiator valves (TRVs), and zone controls that help manage energy usage more effectively.
• Hot Water Tank Insulation: Adding an insulating jacket to a hot water cylinder to reduce heat loss.

Why Does the Distinction Matter?

The distinction between primary and secondary measures is designed to prevent “cherry-picking.” Without these rules, many homeowners might use grant funding solely for new windows or doors, which are aesthetically pleasing but may have a lower impact on carbon reduction than insulating a draughty loft or an uninsulated cavity wall.

By making secondary measures conditional on primary ones, the government ensures that the most impactful work is done first. This is often referred to as the “whole house” approach. It ensures that if you install a high-efficiency heat pump, the heat it generates isn’t immediately lost through uninsulated walls.

Before proceeding with any major home improvement, it is a good idea to check your current energy standing. You can find information on your property’s current performance and recommended improvements via the official government EPC register. This document often lists potential primary and secondary measures tailored specifically to your home.

Financing the Gap: When Grants Are Not Enough

While grants like the ECO4 scheme can provide significant support—sometimes covering the full cost for eligible households—many property owners find they need to supplement these funds. If you do not qualify for a full grant, or if you wish to carry out more extensive renovations than the grant allows, you may look toward financial products such as home improvement loans or bridging finance.

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The Role of Bridging Loans

In some cases, homeowners use bridging loans to fund energy efficiency upgrades quickly, especially if they are renovating a property to sell or move into. Bridging loans are short-term, secured loans typically lasting from a few months up to two years.

There are two main types of bridging loans:

It is important to understand that most bridging loans “roll up” the interest. This means you do not typically make monthly interest payments. Instead, the interest is added to the loan balance and paid off in one lump sum when the loan ends. This can help with cash flow during a renovation, but it means the total debt grows over time.

Risk Warning: Your property may be at risk if repayments are not made. Failure to repay a secured loan could lead to legal action, repossession of the property, increased interest rates, and additional charges that could significantly increase the total amount owed.

How to Qualify for Measures

Eligibility for primary and secondary measures often depends on several factors, including your household income, the current EPC rating of your home, and whether you receive certain government benefits. Under the current ECO4 scheme, the focus is largely on low-income households and those living in the least energy-efficient homes (usually those with an EPC rating of E, F, or G).

Even if you are not eligible for a full grant, you may still be able to access “Great British Insulation Scheme” funding, which targets a broader range of households for single insulation measures. Regardless of the scheme, the primary vs secondary rule typically stays in place to ensure the most effective measures are prioritised.

The Importance of Professional Guidance

Navigating the world of energy grants can be complex. Because the rules regarding what constitutes a primary measure can change depending on the specific funding pot, it is usually advisable to work with an accredited installer. In the UK, installers should be TrustMark registered and, for many schemes, must comply with PAS 2035 standards. These standards ensure that the energy efficiency measures are installed correctly and that the “fabric first” approach is followed.

Using an accredited professional also ensures that the ventilation of your property is considered. When you add primary measures like wall insulation, you make the house more airtight. Without proper ventilation, this can lead to issues with damp and mould. A professional coordinator will ensure that the primary and secondary measures work together to create a healthy living environment.

Summary of Key Differences

To recap, here is a quick comparison of the two categories:

• Primary Measures: The essential “first steps.” They include major insulation work and low-carbon heating systems. They are usually mandatory to unlock further funding.
• Secondary Measures: Supporting improvements like windows, doors, and thermostats. They generally cannot be funded in isolation and are often subject to spending caps based on the primary work.

By understanding this hierarchy, property owners can better plan their renovations and ensure they are maximizing the financial support available to them. Whether you are looking to lower your energy bills, reduce your carbon footprint, or increase the value of your property, starting with primary measures is almost always the most effective strategy.

People also asked

Can I get a grant for double glazing alone?

Typically, no. Under most UK government grant schemes, double glazing is considered a secondary measure and must be accompanied by a primary measure like loft or wall insulation.

Is loft insulation a primary or secondary measure?

Loft insulation is almost always classified as a primary measure because it is one of the most effective ways to prevent heat loss in a home.

What happens if I already have all the primary measures?

If your home is already fully insulated and has a low-carbon heating system, you may find it more difficult to secure grants for secondary measures, as the schemes are designed to tackle the least efficient homes first.

Do I have to pay anything toward primary measures?

This depends on the specific grant and your eligibility; some households receive 100% funding, while others may be required to make a partial contribution to the costs.

Can I choose any installer for grant-funded measures?

No, you generally must use a TrustMark-registered installer who is authorised to work under the specific government scheme you are applying for.

Conclusion

Improving the energy efficiency of your home is a significant undertaking that requires careful planning. By distinguishing between primary and secondary measures, the UK government provides a clear roadmap for homeowners to follow. Starting with the “fabric” of the building ensures that any further investments in secondary measures or new heating systems are not wasted.

While the grant landscape can be competitive and subject to strict eligibility criteria, the long-term benefits of these measures—lower energy bills, increased comfort, and reduced environmental impact—are substantial. If grant funding does not cover the full cost of your intended improvements, ensure any financing you seek is affordable and that you understand the risks associated with secured borrowing against your property.