There is something deeply satisfying about an old house. Thick walls, quirky corners, and a sense of history that new-builds simply cannot match. But when the first cold snap arrives, that character can feel like a liability. Period properties were built in an age of cheap coal and open fires, not airtight efficiency. The good news is that you can cut your heating bills substantially without stripping out the very features that make your home special. The trick is to work with the building, not against it.

Why Period Properties Lose Heat Differently

Older homes rarely have a single weak point. Instead, heat escapes through a dozen small gaps and a few larger ones. Sash windows rattle in their frames, floorboards shrink, chimneys act as open pipes, and solid brick walls offer little resistance compared with modern cavity insulation. The roof space is often under-insulated or, worse, insulated in a way that traps moisture and damages timbers.

This means a piecemeal approach rarely works. You need to think of the house as a system. Stopping draughts makes insulation more effective. Zoned heating ensures you are not paying to warm empty rooms. And when you do all three together, the difference on your energy bills can be startling — often hundreds of pounds a year, even before you touch the thermostat.

Target Draughts Without Harming Character

Draughts are the cheapest and quickest win. They are also the most misunderstood. You are not trying to seal the house hermetically — period properties need to breathe to avoid damp and rot. You are simply closing the obvious holes that let cold air pour in.

• Chimneys: An open fireplace is a giant draught hole. Fit a chimney balloon or a sheep's wool draught excluder when the fire is not in use. Never block a chimney that serves a working flue without proper ventilation.
• Sash windows: Brush seals or silicone draught strips along the staff bead and meeting rail make a huge difference. They are invisible once fitted and allow the window to slide freely. For a low-cost fix, use removable draught tape in winter.
• Doors: External doors need a threshold seal and a brush strip. Internal doors benefit from simple draught excluders, especially between heated and unheated spaces. A heavy curtain over a back door adds another layer.
• Floorboards: Gaps between boards can be filled with flexible wood filler or papier-mâché strips. Avoid silicone, which cracks as the floor moves. If you have a cellar, insulate the ceiling beneath the ground floor.
• Letterboxes and keyholes: Fit a brush letterbox and a keyhole cover. These tiny gaps add up to a surprising amount of heat loss.

Loft Insulation for Old Roofs

If you have less than 270mm of insulation in the loft, you are losing money. Period homes often have just 100mm or none at all. But older roofs need careful handling. You must not block the eaves ventilation, or you will create condensation, damp, and eventually rot in the rafters.

Use a breathable material such as mineral wool, sheep's wool, or wood fibre. Lay it between the joists first, then cross-lay at right angles to cover the timber. Keep the insulation clear of the eaves by using rafter vents or plastic trays. Never compress the insulation — it works by trapping air, and squashing it halves its performance.

If you want to insulate the rafters themselves to create a warm loft, you will need a breathable multifoil or rigid boards with an air gap. This is a bigger job and best done with advice, because getting it wrong traps moisture. For most period homeowners, topping up the loft floor is the simplest, safest, and most cost-effective move.

Zoned Heating and Smart Controls

Heating every room to the same temperature at the same time is wasteful, especially in a rambling old house. Zoned heating lets you warm only the rooms you are using. Thermostatic radiator valves (TRVs) are the entry point — fit them on every radiator except the one in the room with the main thermostat. Turn them down in spare bedrooms, hallways, and utility rooms.

For greater control, consider smart TRVs that can be programmed individually. You can set a schedule for the kitchen in the morning, the living room in the evening, and let bedrooms cool down overnight. If your boiler supports it, split the system into two or three zones with motorised valves. A heating engineer can advise on the best configuration.

• Lower the flow temperature: Modern condensing boilers run most efficiently at 55–60°C, not 70–80°C. This alone can cut gas use by 10–15%.
• Set a realistic schedule: Heat the house for the hours you are actually home. A slightly cooler house with a warm living room beats a uniformly tepid one.
• Use TRVs properly: A setting of 3 is usually around 20°C. Do not leave them on maximum — that just overheats the room and wastes money.
• Balance the system: Radiators furthest from the boiler often stay cold. Balancing the valves ensures even heat distribution, so you can turn the thermostat down without noticing.

Small Habits That Keep an Old House Cosy

Once the draughts are sealed, the loft is topped up, and the heating is zoned, the final layer is how you live in the house. Thermal curtains with a thick lining make a measurable difference on sash windows — close them at dusk and open them in the morning to let in free solar warmth. A rug over bare floorboards reduces heat loss through the floor. And a well-fitted door snake or two costs almost nothing.

Be careful not to over-seal. Period properties need a little background ventilation to manage moisture from cooking, bathing, and breathing. If you notice condensation on windows, open a trickle vent or a window for ten minutes a day. The goal is a warm, dry, breathable home — not a sealed plastic box. With a few targeted improvements, you can enjoy the charm of an old house and a lower heating bill, all without sacrificing the character that made you fall in love with it.