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A cold patch beside your sofa does not tell you which draught-proofing product to buy. The source might be a worn window seal, a gap beneath an external door or an opening that needs to stay clear. Buying first can leave you with unsuitable strips and the original problem still unresolved.
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Learning how to draught-proof your home starts with finding unwanted air movement, not sealing every opening. Work through accessible areas indoors, note what you find, and separate simple product choices from damaged fittings or ventilation questions that need professional advice.
Find the draught safely before choosing a fix
Inspect accessible edges with your hand or a securely held tissue strip, then record the location before deciding what to buy.
Choose a day when you notice the draught, and check with external doors and windows closed normally. Keep ventilation operating as usual rather than covering vents for the test. Use your hand to feel around accessible edges, or hold a small strip of tissue securely beside a suspected gap. Movement is a clue, not proof of the exact cause.
A cold surface alone does not confirm a leak: glass can feel cold without air coming through its edges. Note where you feel movement and whether it changes with the weather. Avoid candles, matches, incense or smoke tests.
Stay on a stable floor and leave awkward or high-level checks to someone suitably equipped. Do not remove covers, dismantle fittings or reach near hot appliances to investigate.
- Make a room-by-room note of the location and apparent condition.
- Photograph visible damage without taking fittings apart.
- Mark uncertain openings as needing advice, rather than assuming they should be sealed.
Separate unwanted gaps from ventilation
Leave designed ventilation and drainage openings clear, and seek advice whenever an opening's purpose is uncertain.
Draught-proofing targets unwanted gaps; it is not a reason to make every room airtight. Window trickle vents, wall vents, air bricks and extractor openings may serve a deliberate purpose. A gap beneath an internal door may also be part of the home's airflow arrangements.
Do not block air vents, flues or ventilation serving fuel-burning appliances. Leave window drainage openings clear too. If you cannot distinguish a drainage slot or designed vent from an unwanted gap, ask the window manufacturer, installer or a suitable professional.
Treat fireplaces and chimney openings as a separate question. Do not stuff them with household materials or fit a closure without appropriate advice, even if you rarely use the fireplace. Resolve uncertainty about ventilation before buying seals.
Check external doors, thresholds and letterboxes
Check the door's condition and operation first; sealing products are not a substitute for repairing a poorly fitting door.
With the door closed normally, check the sides, top and bottom for air movement. Look for split or flattened seals, loose fittings and a gap that changes noticeably along its length. Check the letterbox flap from inside without putting your fingers into its mechanism.
A sound external door with a consistent edge gap may suit a compatible replacement seal or draught strip. A bottom brush needs to match the door and threshold, not simply the door's width. Any addition must allow the door to open, close and latch normally.
If the door sticks, drops, has damaged timber or will not latch properly, arrange assessment rather than disguising the fault with thicker material. Do not modify a fire door, communal entrance door or its seals without appropriate approval and specialist advice.
Match window measures to the actual gap
Identify whether air enters at the opening edge or around the frame, then check the window type and condition before selecting a product.
Feel around the closed opening section, then check the accessible junction between the frame and surrounding wall. These are different locations and may need different responses. Look for damaged seals, cracks or a window that does not close evenly.
For opening edges, compare products intended for your window type and the measured gap range. Do not add a second layer simply because an existing seal looks thin. Material that is too thick can prevent the window from closing or locking properly.
Sash windows, damaged frames and inaccessible external gaps are sensible reasons to ask a repair specialist. Avoid sealing a window shut as a shortcut. If you notice damp marks or repeated condensation alongside the draught, seek an assessment rather than assuming extra sealing will solve both.
Inspect loft hatches and floor-level gaps
Consider seals only for sound, accessible fittings; leave loft access and uncertain floor construction to an appropriate professional.
From floor level, look for an uneven loft hatch, visible edge gaps or signs that it does not sit properly in its frame. Do not climb on furniture or enter the loft just to complete a draught check. If you cannot inspect or measure the hatch safely, arrange help.
For a sound hatch, a compatible edge seal may be worth considering. It must allow the hatch to close securely and must not interfere with catches or an integrated ladder. A damaged or distorted hatch needs assessment first.
Check exposed floorboard gaps and the floor-to-skirting junction where accessible. Flexible products designed for those locations may be suitable, but suitability depends on the floor construction and condition. Do not lift boards or fill openings of uncertain purpose. Loose boards, dampness or damaged timber need attention before cosmetic gap-filling.
Check permissions before altering your home
Clarify repairs and permissions before making changes, particularly in a rented home or on shared or specialist fittings.
If you rent, record the problem and check your tenancy agreement before attaching strips, drilling fittings or applying sealant. Ask your landlord or letting agent about repairs and proposed changes, and keep written confirmation of any permission.
Removable does not necessarily mean damage-free: adhesive products can mark paint or finishes. Describe where the draught occurs and whether the door or window operates correctly, rather than requesting a particular product immediately.
Check any relevant approval requirements for specialist windows, shared entrances or protected building features. Responsibility and permission should be clarified for your home, not assumed from a general shopping guide.
Buy for the gap, not for the cheapest pack
Build a measured list and compare compatibility, coverage and installation requirements before comparing prices.
Measure each confirmed location rather than buying the same strip for every room. Record the length needed and, where safely measurable, the gap dimensions in millimetres. Follow the product's measuring guidance; an uneven gap may need repair rather than one oversized seal.
Compare total requirements, not just the headline pack price. Check supplied length, suitable surfaces, tools, fixings and whether unused material can serve another confirmed location. Two similarly priced packs may cover different lengths or fit different gaps.
For example, a door needing seals along both sides and the top requires those three lengths added together. Do not assume one pack covers it, or that a door-bottom product is included. Read fitting instructions before purchase.
| Possible purchase | What to check before buying |
|---|---|
| Door or window draught strip | Compatible fitting, stated gap range, profile, fixing method and required length |
| Door-bottom brush | Door width, threshold clearance, floor surface and fixing requirements |
| Letterbox draught excluder | Opening dimensions, available fixing space and flap operation |
| Floor-gap product | Suitability for the floor construction, gap dimensions and movement |
Check the result before tackling another room
Check normal operation and reassess the original draught before buying anything else.
After fitting an appropriate product according to its instructions, check the door or window through its normal operation. It should close, latch and lock without force. Make sure vents and drainage openings remain clear.
Revisit the same location when you next notice comparable weather. If the draught remains, reassess its source rather than adding layers. Keep packaging and measurements so you can identify what was fitted or explain the unresolved issue to a repair professional.
Start with one confirmed draught
Start with one room where you regularly notice a draught. Identify the gap, check that it is not intended ventilation, and decide whether it needs a suitable product or a repair. Measure before shopping, keep permissions and product instructions in mind, and reassess the result before moving to the next room.