How to Improve Energy Efficiency in Older Homes

By A Homeowner's Guide to Planning Permission Basics
Comments 35
20 Sep 2026

How to Improve Energy Efficiency in Older Homes

Older homes have character, but they also have draughts, solid walls and a different approach to moisture. Built with lime mortar, timber and breathable materials, they manage humidity by allowing it to evaporate. Modern airtight, plastic-based materials can trap that moisture, leading to damp, rot and structural decay. The key is to improve energy efficiency while respecting the building’s fabric. This guide covers the most effective, low-risk measures for UK homeowners.

Understand the Fabric Before You Improve It

Period properties are not just older versions of modern houses. They are built with different materials and physics. Before you insulate or seal anything, identify what you have: solid brick or stone walls, suspended timber floors, lath and plaster ceilings, and original sash windows. These elements need to breathe. If you cover them with cement render, plastic paint or foil-backed plasterboard, you trap moisture inside. That can rot timbers, corrode lintels and cause cracks. A building surveyor or structural engineer can help you assess the construction. The goal is to cut bills and improve comfort without causing condensation or movement.

Upgrade Heating Controls for Real Savings

Heating controls are the cheapest, least invasive upgrade. Start with thermostatic radiator valves (TRVs) on every radiator except the one in the room with the main thermostat. Set them per room: 18–20°C in living areas, 16°C in bedrooms, and lower in unused rooms. Fit a programmable room thermostat or a smart thermostat with weather compensation. This adjusts the boiler flow temperature based on outside conditions. For a condensing boiler, a flow temperature of 55–60°C is ideal, but older radiators may need 65–70°C to heat the rooms properly. Ask a heating engineer to balance the system and set the correct curve. Zone your heating if possible, and set a schedule that matches occupancy. Turn the heating off when windows are open. These steps can cut gas use by 10–20% with no structural work.

Draught-Proof Windows and Doors Without Harming Them

Original sash windows are a key feature of period homes. Do not replace them with uPVC, especially in conservation areas or listed buildings, where consent is needed. Instead, repair and draught-proof. Fit brush seals or silicone seals to the sides and meeting rails of sashes. Use a draught-proofing strip on casement windows and doors. Secondary glazing is highly effective: a slim, removable acrylic or glass pane fixed inside the reveal. It keeps the original window and reduces heat loss and noise. Thermal curtains and shutters add another layer. However, never seal up permanent ventilation. Old homes need background airflow to control moisture. If you have an open fire or wood burner, you need a dedicated air supply. Blocking a chimney with a balloon stops draughts but can cause damp; use a ventilated cap instead.

Insulate the Loft, But Let It Breathe

Loft insulation is the easiest major upgrade. Aim for 270mm of mineral wool if your joists allow. But in older roofs, do not push insulation into the eaves and block ventilation. Keep a clear air path at the eaves to prevent condensation on the roof timbers. Do not cover downlights unless they are fire-rated and IC-rated; leave a gap or use hoods. For old rafters, avoid rigid PIR boards directly against the timber, as they trap moisture. Use breathable insulation such as sheep’s wool, wood fibre or hemp. If you want to board the loft for storage, raise the floor on cross-battens so you do not compress the insulation. Compressed insulation loses performance. Check the weight: stored items plus boarding can stress old ceiling joists. If you plan heavy storage, ask a structural engineer.

Floors, Walls and Ventilation: The Structural View

Suspended timber floors are common in older homes. Insulate between the joists using breathable insulation held in place with netting or boards. Keep air bricks clear so the void below remains ventilated. For solid walls, internal insulation is possible but risky. It can create a cold bridge at floor and ceiling junctions and trap moisture inside the wall. Use a breathable system, such as wood fibre or lime render, and never use foil-backed plasterboard directly on old brick. External wall insulation changes the appearance and needs planning consent in conservation areas. It also raises the wall thickness, affecting window reveals and gutters. Thermal bridging at junctions can cause damp and mould. Ventilation must be maintained: trickle vents, extract fans in kitchens and bathrooms, and background vents. Airtightness without ventilation leads to condensation, which damages timber and plaster. If you see cracks, movement or rot, stop and get professional advice. Structural engineers can assess whether your home can take extra insulation, heavy render or new services. They also help with party walls, chimney breasts and listed building consent. The best energy efficiency work is planned, breathable and reversible.

Insulation

Improving Drainage Around Older UK Properties

Understand boundary lines, rights of access and dispute resolution routes when renovation work affects a shared wall or fence.

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5 Comments

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- John Abraham says Jul 21, 2024 at 10:00am
  
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  - Robert Sonnysays Jul 21, 2024 at 10:00am
    
    I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
    Reply
Robert Sonny says Jul 21, 2024 at 10:00am

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