One in four UK homes loses heat through draughty doors, according to the Energy Saving Trust. This makes door draught seals one of the cheapest and most effective ways to cut your heating bills. A typical household can save between £25 and £40 per year simply by sealing the gaps around external doors.
Door draught seals cost £15-£30 per door for DIY materials and save £25-£40 per year on heating bills, according to the Energy Saving Trust. They are one of the cheapest ways to reduce heat loss in UK homes.
- Save £25-£40 per year by sealing external door gaps.
- DIY materials cost £15-£30 per door for a semi-detached house.
- Brush strips work best for uneven gaps around doors.
- One in four UK homes loses heat through draughty doors.
- Combine with window and floor sealing for £60-£100 total savings.
- One in four UK homes loses heat through draughty doors, according to the Energy Saving Trust
- Door draught seals reduce annual heating bills
- The three main types of door draught seals explained
- Quick numbers door draught seal costs, savings, and installation time
- The direct answer door draught seals stop cold air entering and warm air escaping around the door frame
- How to verify a professional installer for door draught seals
- Door draught seals reduce condensation risk on interior surfaces
- Letterbox and keyhole draught seals are part of a complete door draught-proofing strategy
Door draught seals are low-cost strips fitted around the edges of a door to block cold air entering and warm air escaping. For a typical semi-detached house, simple DIY materials cost between £15 and £30 per door and can reduce heat loss by up to 25% in the worst-affected homes (Energy Saving Trust, 2026).
One in four UK homes loses heat through draughty doors, according to the Energy Saving Trust
The Energy Saving Trust’s draught-proofing guidance estimates that one in four UK homes has significant heat loss through gaps around external doors (Energy Saving Trust, 2026). In an average semi-detached house, 10–15% of all heating energy escapes through gaps around doors, windows, and floorboards. Simple door draught seals can cut this heat loss by up to 25% in the worst-affected homes. The average cost to draught-proof a single external door is £15–£30 for DIY materials.
Door draught seals reduce annual heating bills
According to the Energy Saving Trust’s draught-proofing savings calculator, a typical household saves between £25 and £40 per year by sealing external doors (Energy Saving Trust, 2026). The exact saving depends on door size, gap width, and existing insulation levels. When combined with other draught-proofing measures such as sealing windows, floorboards, and chimneys, total annual savings can reach £60–£100. These figures assume a gas-heated home and current 2026 energy prices set by Ofgem.
The three main types of door draught seals explained
The Energy Saving Trust’s guide to types of draught-proofing identifies three main categories for door seals (Energy Saving Trust, 2026).
Brush strips (pile strips) are the best option for uneven gaps. They cost £8–£15 per door and consist of nylon bristles that compress to fill irregular spaces. They work well on wooden doors that have warped over time.
Adhesive foam strips are the cheapest option at £3–£8 per door. They are easy to install but less durable, typically lasting one to two years before needing replacement. They work best on doors with even, small gaps.
Rigid rubber or silicone strips cost £10–£25 per door and are more solid. They suit high-traffic doors such as front entrances and can last five years or more. They require careful measuring and cutting but provide a long-term seal.
Quick numbers door draught seal costs, savings, and installation time
| Seal type | Materials cost (per door) | Annual saving | DIY installation time | Lifespan (years) |
|---|---|---|---|---|
| Adhesive foam strip | £3–£8 | £25–£40 | 10–20 minutes | 1–2 |
| Brush strip | £8–£15 | £25–£40 | 20–30 minutes | 3–5 |
| Silicone/rubber strip | £10–£25 | £25–£40 | 30–45 minutes | 5+ |
| Letterbox seal | £5–£15 | £5–£10 | 5–10 minutes | 3–5 |
| Keyhole cover | £2–£5 | £2–£5 | 1–2 minutes | 5+ |
Data from Energy Saving Trust cost and savings data (2026) and typical DIY times from manufacturer instructions (Energy Saving Trust, 2026).
The direct answer door draught seals stop cold air entering and warm air escaping around the door frame
Door draught seals work by creating an airtight barrier between the door and its frame. According to the Energy Saving Trust, gaps of 1mm or more around a door can let in as much cold air as an open window (Energy Saving Trust, 2026). The seals compress against the door or frame to block this airflow. Effective seals reduce condensation, draughts, and heating demand simultaneously by maintaining a stable indoor temperature.
How to verify a professional installer for door draught seals
For full door replacement with integrated seals, use a FENSA-registered installer. FENSA is the government-authorised scheme for building regulations compliance on replacement doors and windows (FENSA, 2026). For retrofitting seals only, TrustMark-registered tradespeople meet government competency standards (TrustMark, 2026). Always check the installer’s public liability insurance and ask for written quotes before work begins.
Door draught seals reduce condensation risk on interior surfaces
Sealing gaps around doors reduces cold air infiltration, which lowers the temperature difference between indoor air and door surfaces. The Department for Energy Security and Net Zero (DESNZ) guidance on condensation notes that less condensation means lower risk of mould growth and timber decay (DESNZ, 2026). Properly sealed doors can improve internal humidity balance, especially in older properties with single-glazed windows or poor insulation.
Letterbox and keyhole draught seals are part of a complete door draught-proofing strategy
Letterbox seals (brush or flap type) cost £5–£15 and save around £5–£10 per year. Keyhole covers (spring-loaded or magnetic) cost £2–£5 and prevent drafts from the lock mechanism. According to the Energy Saving Trust, these small items complete the seal around the door and maximise savings (Energy Saving Trust, 2026). Combined with main door seals, they ensure no gap remains for cold air to enter.
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Frequently Asked Questions
DIY door draught seals cost between £15 and £30 per door for a typical semi-detached house, according to the Energy Saving Trust. Professional installation may add £50-£100 depending on the door type.
A typical household saves between £25 and £40 per year by sealing external doors, according to the Energy Saving Trust's draught-proofing savings calculator. Combined with other measures, total savings can reach £60-£100 annually.
Brush strips (pile strips) are the best option for uneven gaps around doors, according to the Energy Saving Trust. They adapt to irregular surfaces and block draughts effectively.
Yes, door draught seals work on most external doors including wooden, uPVC, and composite doors. The Energy Saving Trust recommends choosing the seal type based on your door's gap size and surface condition.
Door draught seals typically last 5 to 10 years with proper installation and maintenance, according to the Energy Saving Trust. Brush strips may need replacing sooner if exposed to heavy use or weather.
