Let the Cottage Breathe, Just Not Wistfully

An old cottage is not a modern sealed box, and trying to make it one is the fastest route to damp patches, black mould in the corners and a lingering smell of must. Solid walls of stone or brick, lime plaster, timber frames and open chimneys all rely on a certain amount of air movement to carry moisture away. The trick is to slow the air down rather than stop it, holding on to your heat while still letting the building do what it has always done. Traditional draught-proofing does exactly that: it is cheap, reversible and gentle on old joinery.

Aim to take the edge off the wind, not to suffocate the room. Keep any vents, air bricks and trickle openings clear, and never block a flue that serves an open fire or woodburning stove. Rooms with a solid fuel appliance need permanent ventilation to burn safely.

Finding Where the Cold Gets In

Draughts are rarely where you feel them. Cold air creeping across the floor is usually arriving from under a door or through a gap you cannot see. On a breezy day, hold the back of your hand or a lit tea light carefully around the edges of a window or door: at the meeting rail of a sash, along the hinge side, around a letterbox, at a keyhole, under the sill, where the frame meets the wall, and between floorboards near an outside wall.

• Work in order of size. A 15mm gap under a door loses far more heat than a dozen hairline cracks along a frame.
• Test with a feather or a slip of tissue — they flicker where your skin has gone numb to it.
• Look for daylight as well as movement; light through a closed join tells you the gap is real.

Doors: Brushes, Blades and Bolsters

Start at the bottom, because that is where the heat pours out. A screw-fix aluminium carrier with a replaceable brush strip is the most durable answer for an external door, with pile of roughly 6–10mm to suit your gap. Measure the clearance first: if the door drags on a rug or over uneven flagstones, a rigid brush will simply be shredded, and a weighted fabric bolster or a long door snake is kinder. Fill homemade excluders with rice, dried beans, buckwheat hulls or sand — the weight keeps them in place — and stitch them from heavyweight upholstery fabric or old corduroy.

• Letterboxes: fit a brush plate outside and a flap inside, and check the flap drops fully.
• Keyholes: a small escutcheon cover costs pennies and stops a surprising whistle.
• Door edges: self-adhesive foam or E-profile strip works on a painted, sound frame, but avoid smearing silicone sealant around an old door. It traps moisture, damages historic timber and makes future repairs a misery.
• Uneven gaps: pare back the offending edge with a plane, or ease the frame with a little wax, rather than forcing the door shut against a seal.

Windows Without Sealing Them Shut

Sash windows have to slide, so anything you fit must allow that. Brush pile or a springy bronze strip set into the parting beads and meeting rail will quieten a rattling sash and cut the draught while still letting the window run. For the frame-to-wall junction, where plaster may be lime and slightly damp, use hemp or oakum packed in gently and finished with a lime mortar or a breathable mastic. Never inject expanding foam into a solid wall; it can crack plaster as it swells and it holds water against the timber.

Where you want more, fit secondary glazing panels with magnetic tape or turnbuckles. They are removable, so the window still opens for ventilation and cleaning, and they are far kinder to a listed building than replacement glazing. Shrink-film kits are a useful stopgap for a single cold winter in a spare room, but they are brittle, disposable and better thought of as a last resort than a permanent fix.

Curtains, Linings and the Window Chimney

Warm air rises up the glass, cools, and slides back down as a cold current across the floor — the reason a window can feel draughty even when it is perfectly sealed. Heavy curtains drawn across it at dusk interrupt that loop beautifully. Look for a thermal lining, or add an interlining of domette or bump, and hang the curtains so they touch the floor or at least drop well below the sill.

• Width matters: allow enough fabric to gather properly, or the curtains will pull flat and leak air at the edges.
• Add a pelmet or valance over the top, which traps the rising warm air and stops it cooling against the glass.
• Open them in the morning to let sunlight and air in, and close them before the temperature drops.
• Internal door curtains across a hallway or stairwell are old-fashioned and extremely effective.

A Seasonal Habit That Keeps the Cottage Sweet

Draught-proofing is not a one-off job. Walk round in early autumn with a candle, replace worn or flattened brush strips, and re-stitch any bolster that has shed its filling. Keep linings laundered and pelmets dust-free. Then watch the building for its reply: a light film of condensation on a bedroom window in the morning is normal, but streaming glass, damp sills or a fusty smell means you have gone too far and need to let more air through. Balance is the whole art — warm, quiet and comfortable, with the old walls still able to sigh.