Written by Dan Swingewood in November 2025: Five Simple Ways Homeowners Can Improve Energy Efficiency.

Energy efficiency is now a key consideration for homeowners across the country looking to improve indoor comfort levels, reduce energy bills, and lower their environmental impact. While substantial retrofits and renewable energy systems can deliver impressive results, many homes can achieve substantial gains through a few well thought upgrades. Here are five simple ways to enhance your home’s performance:

Insulation Upgrading:

Poor insulation remains one of the leading causes of heat loss in UK homes. Around 25% of heat can escape through an uninsulated roof, so start by checking the loft (Energy Saving Trust, n.d.). Aim for a minimum of 270 mm mineral wool insulation (100mm Knauf Insulation Loft Roll 44 between joists & 170mm Knauf Insulation Loft Roll 44 over joists) laid in two perpendicular layers to minimise cold bridges. If your property has solid masonry walls, there are multiple ways to insulate such as internally insulating with Woodfibre such as STEICO or sheep’s wool insulations such as Thermafleece Ultra which can achieve U-values around 0.30 W/m²K while also improving breathability and internal air quality.

Eliminate unwanted draughts and air leakages:

Even with good insulation, uncontrolled air movement can undermine efficiency. Common leakage points include service penetrations, window frames, and loft hatches. Seal gaps around windows and doors with weatherstripping or sealant, add draught excluders to the bottom of doors, and hang thermal curtains. However, building that are airtight should still be allowed to breathe, therefore adding mechanical ventilation with heat recovery (MVHR) can recover up to 90% of extracted heat (BPC, 2024).

Upgrade to LED Lighting:

Lighting typically makes up around 5% of an average home’s total energy bill. According to Energy Saving Trust, (n.d.), replacing halogen or incandescent bulbs with A++ rated LED fittings can cut lighting energy by up to 80%. Also, LEDs last significantly longer than halogen bulbs. Up to 20x longer in many cases, so you may not need to replace them for many years.

Optimise Heating Controls:

Smart heating controls deliver quick returns with minimal disruption. Programmable thermostats and zoning systems help heat only occupied spaces. Lowering your thermostat by 1 °C can reduce heating bills by around 10% (Energy Saving Trust, 2021). When replacing heating systems, air source heat pumps are substantially more efficient than conventional gas or oil boilers. ASHPs can reach 300–400% efficiency, whereas a modern condensing gas boiler usually runs at 90–94% efficiency (i.e., 1 unit of gas produces 0.9–0.94 units of heat) (Robinson M, 2025).

Upgrading Glazing Systems:

Windows can account for up to 20% of total heat loss in an average home (Brick, 2025). Replacing old single glazing with modern low-E double or triple glazing significantly reduces energy waste and improves comfort. Currently, Approved Document L in the Building Regulations requires a whole-window U-value of 1.4W/m²K. However, there are window systems such as Norrsken’s Triple Glazed Opening Alu-Clad Timber Frame Window which has a whole- window U-value of 0.68W/m²K. These types of products not only reduce thermal loss but also reduces noise pollution.

A Smarter, Healthier & More Comfortable Home

Every home is unique, but these five measures provide a strong foundation for better energy performance. inc Architects works with homeowners to design retrofit solutions that balance sustainability, practicality, and architectural character providing services from insulation detailing and airtightness strategies to glazing specifications and renewable integration.

Contact inc Architects to discuss how thoughtful design and targeted upgrades can help make your home warmer, more efficient, and future ready.

References:

Energy Saving Trust (no date) Roof and loft insulation guide – energy saving trust, Home insulation to reduce home heat loss Roof and loft insulation. Available at: https://energysavingtrust.org.uk/advice/roof-and-loft-insulation/ (Accessed: 31 October 2025).

BPC. (2024) What is heat recovery?, BPC Ventilation Store. Available at: https://bpcventilation.com/blogs/knowledge-base/what-is-heat-recovery?srsltid=AfmBOopFL3-6AJeVPZVQ_rYj-_myqXXIp4aJujWNQHaeCMAi0CNICKJO (Accessed: 31 October 2025).

Energy Saving Trust (no date a) Energy saving light bulbs and lighting – energy saving trust, Buying energy efficient products Energy saving light bulbs and lighting. Available at: https://energysavingtrust.org.uk/advice/lighting/ (Accessed: 31 October 2025).

Energy Saving Trust (2021) New research finds 96% of UK homeowners are concerned about their home energy efficiency. Available at: https://energysavingtrust.org.uk/new-research-finds-96-of-uk-homeowners-are-concerned-about-their-home-energy-efficiency-yet-one-in-five-arent-taking-simple-steps-to-improve-it/ (Accessed: 31 October 2025).

Robinson, M. (2025) Air Source Heat Pump Efficiency, Future Heat. Available at: https://bit.ly/futureheatltd (Accessed: 31 October 2025).

Brick, A. (2025) U-values for windows: Boost energy efficiency and cut heat loss, Six over Six windows – Sash window refurbishment specialists London. Available at: https://sixoversixwindows.co.uk/blog/u-values-for-windows/ (Accessed: 31 October 2025).