A Landlord's Guide to Energy Efficiency Improvements in Older Teesside Properties

If you own an older rental property in Middlesbrough — and a significant proportion of the town's most profitable buy-to-let stock consists of Victorian and Edwardian terraces — there is a high probability that its Energy Performance Certificate rating is D or below. With the government moving towards a minimum EPC rating of C for all rental properties, and tenants increasingly factoring energy costs into their housing decisions, improving your property's energy efficiency is no longer optional.

The good news is that many of the most effective improvements are surprisingly affordable, and the return on investment — through higher rents, faster lets, and future compliance — makes them worthwhile even before any legal deadline arrives.

Understanding EPC Ratings

An Energy Performance Certificate rates a property from A (most efficient) to G (least efficient) based on its estimated energy costs per square metre. The assessment considers insulation, heating systems, windows, lighting, and other factors.

Most newer properties achieve ratings of B or C. Older Middlesbrough properties — particularly those built before 1920 with solid walls, single-glazed or early double-glazed windows, and older heating systems — typically rate at D or E. Some of the least efficient properties rate at F or G, though current legislation already prohibits letting properties with ratings below E.

The proposed minimum of C will affect a large number of properties across Teesside. If your property currently rates at D, you need to plan improvements now rather than waiting for the deadline.

The Most Effective Improvements

Not all energy efficiency measures deliver equal value. Here are the improvements that make the biggest difference for typical Middlesbrough rental properties, ranked by cost-effectiveness.

1. Loft Insulation (Best Value)

Cost: £300 to £600 for a standard terrace or semi EPC impact: Can improve rating by 5 to 15 points Payback period: 1 to 2 years through reduced void periods and tenant appeal

If your property has less than 270mm of loft insulation — and many older Middlesbrough properties have 100mm or less — topping up is the single most cost-effective improvement you can make. The material costs are low, installation is straightforward, and the impact on the EPC rating is disproportionately large.

For terraced houses in TS1, TS3, and TS5, loft insulation is often the difference between a D and a C rating. It should be the first thing any landlord addresses.

2. Boiler Upgrade

Cost: £2,000 to £3,500 for a modern condensing combi boiler EPC impact: Can improve rating by 10 to 20 points Payback period: 3 to 5 years

If your property still has an older, non-condensing boiler, replacing it with a modern A-rated condensing model is one of the most impactful changes you can make. Modern combi boilers are significantly more efficient — converting over 90% of fuel into heat compared to 60% to 75% for older models.

Beyond the EPC improvement, a new boiler reduces breakdown risk, lowers tenant energy bills, and removes a major source of maintenance call-outs. For Middlesbrough landlords with ageing heating systems, this investment pays for itself through reduced maintenance costs and improved tenant satisfaction.

3. Cavity Wall Insulation

Cost: £500 to £1,200 depending on property size EPC impact: Can improve rating by 10 to 15 points Payback period: 2 to 3 years

Properties built from the 1930s onwards typically have cavity walls that can be insulated by injecting insulating material through small holes drilled in the external walls. It is quick, minimally disruptive, and highly effective.

However, this option is not available for all Middlesbrough properties. Many Victorian terraces have solid walls with no cavity — these require different treatment (see below). Before commissioning cavity wall insulation, have a surveyor confirm that the property has suitable cavities and that injection is appropriate.

4. LED Lighting

Cost: £50 to £150 for a full property conversion EPC impact: 1 to 5 points Payback period: Immediate

Replacing all light fittings with LED bulbs is trivially cheap and contributes a small but meaningful improvement to the EPC rating. There is no reason not to do this in every property you own. Modern LED bulbs produce excellent light quality, last for years, and use a fraction of the energy of older halogen or CFL bulbs.

5. Hot Water Cylinder Insulation

Cost: £20 to £50 for a jacket EPC impact: 1 to 3 points Payback period: Immediate

If your property has a hot water cylinder (rather than a combi boiler), adding or upgrading the insulation jacket is almost free and takes minutes to install. A properly insulated cylinder loses far less heat, reducing energy waste.

6. Draught Proofing

Cost: £100 to £300 EPC impact: 1 to 3 points Payback period: Within 1 year

Sealing gaps around doors, windows, letterboxes, and floorboards reduces heat loss and improves comfort. For older Middlesbrough terraces with original sash windows or poorly fitting doors, draught proofing can make a noticeable difference to both the EPC rating and the tenant's experience of living in the property.

7. Double Glazing

Cost: £2,500 to £5,000 for a standard terrace EPC impact: 5 to 10 points Payback period: 5 to 8 years

If the property still has single glazing — increasingly rare but not unknown in Middlesbrough — replacing with double-glazed windows is a significant investment with a substantial impact. If the property already has double glazing that is 15 to 20 years old, upgrading to modern A-rated units will improve efficiency but at a lower marginal benefit.

8. Solid Wall Insulation (For Properties Without Cavities)

Cost: £5,000 to £12,000 for internal insulation; £8,000 to £20,000 for external EPC impact: 15 to 25 points Payback period: 8 to 15 years

This is the most expensive improvement on the list, but for solid-walled Victorian terraces that cannot have cavity wall insulation, it may be the only way to achieve a C rating. Internal wall insulation — adding insulated dry lining to external walls — is the more affordable option and is practical for most Middlesbrough terraces.

External wall insulation involves adding insulating material to the outside of the building, which changes the property's appearance and may require planning permission. It is rarely used on traditional terraced streets for aesthetic and practical reasons.

Prioritising Improvements

For a typical Middlesbrough terrace currently rated D, the following sequence of improvements will typically achieve a C rating at the lowest overall cost:

1. Loft insulation top-up (£300-600) — biggest bang for the buck
2. LED lighting throughout (£50-150) — negligible cost, immediate return
3. Hot water cylinder jacket (£20-50) — if applicable
4. Draught proofing (£100-300) — low cost, noticeable impact
5. Boiler upgrade (£2,000-3,500) — if the existing boiler is old or inefficient
6. Cavity wall insulation (£500-1,200) — if cavities are present

Steps 1 through 4 can often be completed for under £1,000 and may be sufficient to push a low D rating into C territory. If the property is a solid E, the boiler upgrade and cavity wall insulation (or internal wall insulation for solid-walled properties) will likely be needed as well.

Grants and Funding

Several grant schemes are available to help offset the cost of energy efficiency improvements:

ECO4 (Energy Company Obligation). Energy companies are required to fund efficiency improvements for eligible households. Some landlords can access ECO funding if their tenants meet income or benefit criteria. Check with your energy supplier or a registered ECO installer.

Local authority grants. Middlesbrough Council and the Tees Valley Combined Authority periodically offer grant funding for energy efficiency work in the private rented sector. These programmes change regularly, so check the council's website or contact their housing team for current availability.

Boiler upgrade scheme. While primarily aimed at heat pump installations, the Boiler Upgrade Scheme provides grants of up to £7,500 for qualifying low-carbon heating systems. If your property is suitable for an air source heat pump, this could significantly reduce the cost of a heating upgrade.

The Return on Investment

Beyond compliance, energy efficiency improvements deliver tangible financial returns:

Higher rents. Properties with EPC ratings of C or above command a measurable premium in the Middlesbrough market — typically £25 to £50 per month more than comparable properties rated D or below.

Faster lets. Energy-efficient properties attract more tenant enquiries and let more quickly. In a market where tenants are increasingly cost-conscious, a good EPC rating is a competitive advantage.

Lower maintenance costs. A modern boiler, good insulation, and sealed windows reduce the frequency and severity of maintenance issues. Damp, condensation, and heating complaints all diminish in well-insulated, well-ventilated properties.

Capital value. Energy-efficient properties are increasingly valued by buyers as well as tenants. Improvements you make now will be reflected in the property's value if you decide to sell in the future.

Talk to Ascot Knight

At Ascot Knight, we advise Middlesbrough landlords on the most cost-effective route to EPC compliance. We can review your property's current rating, recommend targeted improvements, and connect you with trusted local contractors who specialise in energy efficiency work for rental properties. Contact our team today for a free, no-obligation assessment.