How to Improve an EPC Rating on a Rental

If your rental property has an Energy Performance Certificate below band E, or you want to get ahead of the proposed rise to band C, a handful of upgrades move most properties further than any other single measure: loft and cavity wall insulation, LED lighting, better heating controls, and, where the budget allows, a new boiler or improved glazing. Which of these matters most depends heavily on the property's age, construction and current rating, which is why the recommendation report attached to your EPC is a better starting point than a generic list.

This guide groups the common improvements by rough cost, from the cheapest quick wins through to major fabric works, and covers when an improvement genuinely is not worth doing. For the legal minimum standard itself and how exemptions work, see our EPC requirements guide.

Quick wins

A few improvements cost relatively little and are worth doing on almost every property, regardless of its current rating:

• LED lighting throughout. Swapping every bulb for LED equivalents is inexpensive and has a measurable, if modest, effect on the assessment. It is also one of the few improvements a landlord can complete in an afternoon without booking a contractor.
• Loft insulation. If the loft has little or no insulation, topping it up to the recommended depth is usually one of the cheapest improvements available relative to the points it adds, and it also reduces heat loss, which matters to tenants paying their own heating bills.
• Cavity wall insulation. Where the property has cavity walls that are not already filled, this is another comparatively low-cost job with a reasonable effect on the rating. Solid wall properties do not have this option and need a different, more expensive approach, covered below.
• Heating controls. Adding thermostatic radiator valves, a modern programmable thermostat, or improving zoning between rooms is a low-cost job that the assessment rewards, on top of making the property more comfortable to heat efficiently.
• Draught-proofing. Sealing gaps around doors, windows and letterboxes is cheap and, while it has a smaller effect on the certificate than the items above, is nearly always worth doing during any changeover between tenants.

None of these require specialist trades beyond an installer for cavity wall insulation, and most can be arranged during a short void period without disrupting a sitting tenant.

Medium cost works

The next tier of improvements costs more and usually needs some planning around a tenancy or void period:

• Boiler replacement. An old, inefficient boiler dragging down the rating is a common finding on older properties. Replacing it with a modern condensing boiler is a mid-range cost that often moves the rating meaningfully, and it also reduces the tenant's running costs, which is worth mentioning if you are trying to justify a rent that reflects a well-maintained property.
• Double glazing. Where a property still has single glazing, replacing it is a solid mid-cost improvement, though the effect on the certificate varies depending on how much of the property is affected and what it is being replaced with.
• Hot water cylinder insulation. A quick, inexpensive addition if the property has an unlagged cylinder, though this tends to be a smaller line item within a larger heating upgrade rather than a project on its own.
• Underfloor insulation. Relevant mainly to properties with suspended timber floors over an unheated space, such as many Victorian and Edwardian terraces, and worth pricing alongside loft insulation if you are already having assessment work done.

As a worked example, a two-bedroom terraced house rated F, with gas central heating and no loft insulation, might reach band E through loft insulation and LED lighting alone, both quick wins. A similar property that is already at band E but wants to push toward band D might need the boiler replaced or the glazing upgraded on top, since the cheapest measures have already been exhausted.

Major works

Some properties, particularly older ones with solid walls or no mains gas, cannot reach a meaningfully better band through quick or medium measures alone, and need a larger project:

• Solid wall insulation, applied internally or externally, is one of the more disruptive and expensive measures available, but it can move a period property by several bands where cavity insulation is not an option.
• A heat pump, replacing an oil or electric heating system, is a substantial cost but can be worth exploring where an old, inefficient system is the main factor holding the rating down, particularly with any grant support that may be available at the time.
• A full rewire alongside insulation and heating work, where the electrics need replacing anyway (for example, following an unsatisfactory EICR), can be a sensible point to combine works, since scaffolding, access and disruption to tenants are shared across projects rather than repeated for each one separately.

Major works are rarely justified by the EPC improvement alone. They tend to make financial sense when combined with other reasons to do the work, such as a boiler at the end of its life, an EICR that has already flagged a rewire, or a refurbishment between tenancies. Our buy-to-let costs checklist is a useful companion for budgeting a project like this alongside your other running costs.

When not worth it

Not every improvement suits every property, and it is worth being honest about when the cost is disproportionate to the benefit:

• Solid wall insulation on a period property with characterful brickwork or a conservation area restriction can be expensive, disruptive to tenants, and in some cases not permitted at all, so check planning restrictions before pricing the work.
• Chasing a specific band purely to hit a proposed future deadline that is not yet confirmed law is a risk, since the exact timetable for any rise to band C has moved before and could move again. It is more sensible to make general efficiency improvements opportunistically, for example during a void period, than to commit to a major project against a date that is still provisional.
• A property close to the end of your intended holding period. If you plan to sell within the next year or two, the return on a major fabric improvement is harder to justify than for a property you intend to hold for a decade.
• Relying on a specific exemption instead of pricing the work first. Landlords sometimes assume a high cost exemption applies without actually getting a quote, only to find the cheapest measures, such as loft insulation, are well within typical funding caps and would have taken less time than documenting the exemption.

Before committing to any significant spend, get an up-to-date EPC recommendation report and at least two quotes for the work it suggests. The report ranks measures by the assessor's software in the order they are estimated to help, which is a far more useful starting point for a specific property than a generic checklist like this one.

How Property HQ helps

Property HQ keeps your EPC rating and expiry date alongside gas safety, EICR and licensing certificates in one compliance record, so you can see at a glance which properties in your portfolio need attention before a rating becomes a problem at the next relet. Having certificate history and property details together also makes it easier to plan improvement works around other jobs, such as a boiler replacement or a rewire, rather than treating each certificate as a separate, unconnected task.

Disclaimer

This guide is general information for UK landlords, not energy assessment, legal or financial advice, and EPC policy is subject to change. Check GOV.UK for the current minimum standard, any proposed changes, and available grant schemes before committing to improvement works.