Friday, 11 September 2026. Improving the energy efficiency of Britain's homes sounds like one of the least controversial objectives in housing. A warmer property that wastes less energy should be good for the tenant, good for the building and better for the environment.
The difficult conversation begins when somebody asks how much the work will cost.
For London's private rental sector, this question is particularly significant because improving an existing property can be very different from designing an efficient new home from the beginning. Older terraces, converted houses, period flats and leasehold buildings can all present practical and financial challenges.
Sustainability in rental property therefore cannot be discussed seriously without discussing economics.
Why older homes are difficult to upgrade
A modern building can incorporate insulation, efficient heating, ventilation and energy-conscious design from the construction stage.
An older London property may require improvements to be introduced around a building that was never designed for modern energy standards.
Some interventions are relatively straightforward. Others can involve substantial work, specialist advice, planning considerations or coordination with freeholders and other leaseholders.
There can also be unintended consequences if improvements are poorly designed. Making a property more airtight without thinking properly about ventilation, for example, can create new moisture-management problems.
Retrofit therefore needs to be treated as a building-performance issue rather than a shopping list of supposedly green products.
The landlord and tenant experience is different
A tenant may experience energy efficiency through comfort and bills.
Does the home retain heat?
Is one bedroom considerably colder than another?
How difficult is the property to heat during winter?
A landlord sees another side of the same building.
How much will improvement cost?
How long will the work take?
Can it be carried out while the property is occupied?
Does the lease permit it?
What maintenance will the new system require?
How long will the investment last?
Neither perspective is unreasonable.
A workable transition to more efficient rental housing needs to recognize both.
Regulation will continue to influence investment decisions
Energy performance requirements have already become part of the basic compliance landscape for rented property, and government policy continues to focus on improving the energy performance of homes.
For landlords, the sensible response is not to wait for every future requirement to become urgent.
Energy performance can instead form part of planned property investment. When a heating system reaches the end of its life, its replacement can be considered in the context of the property's wider efficiency. When major refurbishment is already taking place, there may be opportunities to improve insulation or ventilation at a lower marginal cost than carrying out the same work separately later.
That is very different from replacing perfectly serviceable components simply to claim that a property is sustainable.
Better efficiency and affordability need to coexist
This is where the debate becomes more complicated.
Large-scale improvement of Britain's rental housing requires investment. If improvement costs become economically unrealistic for some landlords, there is a risk of unintended consequences for rental supply or affordability.
Equally, doing nothing leaves tenants living in inefficient properties and delays progress towards environmental objectives.
The challenge is therefore not deciding whether homes should become more efficient.
It is finding ways to make that improvement technically sensible, financially realistic and fair to the people living in the properties.
That requires better information, sensible investment planning, appropriate government policy and a much more mature conversation than simply telling landlords to “go green”.
What does a sensible sustainability plan look like?
For an existing rental property, it begins with understanding the building.
Look at its current energy performance, heating, insulation, ventilation, windows and recurring maintenance problems. Separate improvements that are genuinely useful from those that merely sound environmentally impressive.
Then consider when work makes most sense.
A property becoming vacant may create an opportunity for more disruptive improvements. A planned refurbishment may allow several measures to be coordinated. A component reaching the end of its usable life may create a natural point to replace it with a more efficient alternative.
This approach will not transform London's housing stock overnight.
But sustainability in existing property was never going to be solved overnight.
The more realistic objective is to make each major property decision leave the building better than it was before.
Information correct as of 11 September 2026. Regulatory requirements vary according to the property, tenure and location. This article provides general information and should not be treated as legal, financial or energy-efficiency advice.
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