Why period terraces can feel so draughty

Older terraced houses have a character that modern homes simply cannot match. They also have gaps. Victorian and Edwardian terraces were built before modern draught-proofing standards, with timber sash windows, solid brick walls, suspended timber floors and open chimneys. They were designed to breathe. What was once useful ventilation now feels like a cold breeze across the living room. The good news is that most draughts come from a handful of predictable places, and you can tackle them in a weekend with basic tools and a modest budget.

Before you start, remember that period homes need some ventilation. The aim is to stop unwanted draughts, not seal the house completely. Blocking every gap can trap moisture and lead to damp, mould and rotting timber. Work room by room, and keep air bricks, trickle vents and extractor fans clear.

Start by finding the worst offenders

On a cold, windy day, hold a lit incense stick or a piece of tissue near suspected gaps. Watch for smoke or tissue fluttering. Check:

• Around window frames, especially where the top and bottom sashes meet.
• Door frames, letterboxes, keyholes and the gap under external doors.
• Between floorboards, around skirting boards and where pipes enter floors.
• Chimneys, loft hatches and old vents that are no longer needed.

Then prioritise. Start with the coldest rooms and the gaps you can feel with your hand. A cheap infrared thermometer can help, but your hand is often enough. Work from the most uncomfortable room outwards.

Draught-proofing windows without ruining period features

Sash windows are beautiful but leaky. The main culprits are the meeting rail where the sashes overlap, the sides of the sashes, and any gaps around the frame. For a reversible fix, fit brush or foam draught seals into the sash channels. Self-adhesive foam strips work well on casement windows, but clean the frame first and avoid stretching the strip. For gaps between the frame and the wall, use a flexible acrylic sealant or frame sealant. It paints over, stays slightly flexible and will not crack like rigid filler. If your windows still rattle, a small amount of silicone grease on the sash runners can help them slide smoothly without leaving gaps.

Avoid sealing up trickle vents, and do not block the small gaps that allow condensation to escape. If a window is permanently painted shut, do not force it. Work around it with removable seals instead. This keeps the option of opening it later.

Doors, letterboxes and keyholes

External doors are a major source of draughts. Fit a brush-style draught excluder to the bottom of the door, or use a screw-on rubber seal if there is a threshold. For the sides and top, use a self-adhesive foam or rubber seal, but check the door still closes easily. Letterboxes need attention too: fit a flap with a brush seal or a metal flap with a spring. Keyholes are small but cold; a simple keyhole cover or escutcheon with a brush seal costs a few pounds.

For internal doors to cold hallways or porches, a fabric draught excluder, often called a door snake, is cheap and effective. If your front door has a gap between the frame and the wall, seal it with expanding foam designed for windows and doors. Use it sparingly, as it expands. Always leave a small gap for ventilation if you have a gas boiler or open fire in the room.

Floorboards, skirting and chimneys

Suspended timber floors in Victorian and Edwardian terraces are notoriously draughty. Cold air comes up between the boards and around the skirting. For gaps between floorboards, use a flexible, paintable sealant or a narrow foam backer rod pushed into the gap and sealed over. Avoid rigid filler, which will crack as the floor moves. For larger gaps, traditional methods include cutting thin strips of wood or using papier-mâché, but a modern flexible sealant is usually quicker. Around skirting boards, run a bead of acrylic caulk along the top and bottom, then smooth it with a damp finger. This simple job can make a noticeable difference.

Chimneys are another big one. An open chimney is essentially a hole in your living room. If you do not use the fire, fit a chimney balloon or a sheep’s wool draught excluder. If you do use it, choose a removable chimney draught excluder. Never block a chimney that serves a working appliance without professional advice. Also check loft hatches: a simple foam strip around the frame and a hook-and-loop tape can stop a surprising amount of cold air.

Keeping it affordable and safe

Most of these fixes cost under £50 in total and take an afternoon. A caulk gun, a few tubes of acrylic sealant, foam strips, brush seals and a door excluder are the basics. Buy slightly more than you think you need, because you will find more gaps as you go. Work from the coldest room outwards, and test your work with the incense stick again.

Remember that draught-proofing is not about making your home airtight. Period properties need airflow to manage moisture. Keep bathroom and kitchen extractor fans working, leave trickle vents open if you have them, and do not block air bricks. If you have an open fire, a gas boiler or a solid-fuel stove, make sure you are not starving the room of combustion air. When in doubt, consult a qualified tradesperson. A warmer, quieter period home is within reach, without the cost or disruption of a major renovation.