Draught Proofing: Complete Guide

Quick Answer: How Much Can Draught Proofing Save You?

Draught proofing a typical UK home costs £100 to £300 for DIY materials or professional installation of the main draught points, and can save a noticeable amount on annual heating bills by preventing warm air escaping and cold air entering through gaps around doors, windows, and other openings. It is one of the most cost-effective energy efficiency improvements available, often paying for itself within a single heating season.

Where Draughts Commonly Come From

Location	Typical Draught Source
External doors	Gaps around the frame, letterbox, and keyhole
Windows	Gaps around frames, particularly on older single-glazed units
Loft hatch	Unsealed edges allowing warm air to escape upward
Floorboards	Gaps between boards in suspended timber floors
Chimneys	Open, unused chimneys acting as a constant air passage
Skirting boards	Gaps where skirting meets the floor, especially in older properties

Draught Proofing Doors

Fit a brush or foam strip draught excluder along the bottom of external doors
Add a letterbox brush or flap to reduce airflow through the letterbox opening
Use foam or rubber strip sealant around the door frame where gaps are visible
Consider a keyhole cover for older doors with a traditional keyhole design

Draught Proofing Windows

Self-adhesive foam strips applied around the window frame seal small gaps effectively
Silicone sealant works well for gaps between the window frame and surrounding wall
Secondary glazing film can add a low-cost temporary barrier for particularly draughty single-glazed windows
Heavy curtains, closed at night, add an extra layer of insulation against window draughts

Sealing the Loft Hatch

A loft hatch is often overlooked but can be a significant source of heat loss if left unsealed, since warm air naturally rises and escapes through any gaps around the hatch frame. Fitting a foam seal around the hatch edge and ensuring it closes snugly addresses this straightforward but frequently missed draught source.

Chimney Draught Proofing

An open, unused chimney can act as a constant draw of cold air into the room and warm air escaping upward. A chimney draught excluder, either an inflatable balloon type or a specific fitted cap, can significantly reduce this while still allowing the flue to be used again if needed by simply removing the excluder first.

Floorboard Draught Proofing

Older properties with suspended timber floors often have gaps between floorboards that let cold air through from the void beneath. Products range from simple silicone-based fillers for smaller gaps to specialist flexible sealant strips designed to move with natural floorboard expansion and contraction.

Draught Proofing Cost Breakdown

Item	Typical Cost
Door draught excluder strips	£5 to £20 per door
Letterbox brush/flap	£10 to £25
Window foam strips	£5 to £15 per window
Chimney draught excluder	£15 to £40
Loft hatch seal	£10 to £20
Professional whole-house draught proofing	£150 to £350

Draught Proofing and Ventilation Balance

While reducing unwanted draughts is beneficial, homes still need adequate ventilation to prevent condensation and maintain good indoor air quality. Trickle vents in windows, extractor fans in kitchens and bathrooms, and general room ventilation should not be sealed shut as part of a draught proofing project, since this can create damp and air quality problems.

DIY Draught Proofing vs Professional Installation

The vast majority of draught proofing tasks, from door strips to window foam seals, are straightforward DIY projects requiring minimal tools and skill. Professional installation is generally only worth considering for larger properties needing comprehensive treatment or older, more complex window and door setups where a tailored approach gives better results.

Frequently Asked Questions

How much can draught proofing save on heating bills?

Savings vary by property, but draught proofing is consistently identified as one of the most cost-effective energy efficiency measures available, often delivering a noticeable percentage reduction in heat loss for a relatively small upfront cost.

Does draught proofing cause condensation problems?

Excessive draught proofing that blocks essential ventilation, such as trickle vents or extractor fans, can contribute to condensation, so it is important to draught proof unwanted gaps while maintaining intentional ventilation points.

Can you draught proof an open fireplace you still use?

Yes, but a permanent chimney balloon excluder is not suitable if the fireplace remains in regular use; instead, look for products specifically designed for occasional-use fireplaces that can be easily removed and refitted.

Is draught proofing worth it for a well-insulated modern home?

Even well-insulated modern homes can have draughts around doors, windows, and loft hatches, so draught proofing remains a worthwhile, low-cost addition even where other insulation is already good.

How do I find where draughts are coming from?

A simple method is holding a lit candle or incense stick near likely draught points, such as door and window frames, and watching for flame movement indicating airflow, though a professional thermal survey can identify less obvious sources more precisely.

Expert Insight

Energy assessors frequently highlight draught proofing as the single best value-for-cost energy efficiency measure available to UK homeowners, given the very low material cost relative to the heat loss reduction achieved, particularly in older properties with more numerous gaps and joints.

Final Thoughts

Draught proofing offers an exceptional return relative to its low cost, addressing one of the most common and avoidable sources of heat loss in UK homes. Working through doors, windows, the loft hatch, and any unused chimneys systematically will address the majority of draught sources in most properties.

Starting a draught proofing project? Tackle the biggest, most obvious gaps first, such as external doors and an unused chimney, before moving to smaller, more time-consuming details like individual floorboard gaps.