Why Does My Chimney Cause a Cold Draft in My Home?

An open fireplace is a charming feature in many UK homes, particularly in older properties, with around 60% of our housing stock built before 1960. While a roaring fire can be incredibly cosy on a cold evening, traditional open fireplaces and wood burners are not the most energy-efficient or environmentally friendly ways to heat a home. Beyond that, they can actually contribute to unwanted cold drafts, making your home feel chillier than it should.

Keeping your home warm involves more than just turning up the heating—it’s about preventing warm air from escaping and cold air from seeping in. One of the biggest culprits for heat loss in homes with open fireplaces is the chimney itself, even when the fire isn’t in use.

The Stack Effect: How Your Chimney Pulls Warm Air Out

The amount of air escaping through your chimney is largely influenced by what’s known as the “stack effect.” This principle describes the movement of air into and out of a building and is affected by factors such as the height of your home and the temperature difference between the inside and outside.

If you live in a multi-story home, keep your heating on, and the outdoor temperature is low, the stack effect can be significant. As warm air rises, it creates negative pressure inside your home, pulling in cold air from gaps around doors, windows, and other openings. This creates those unpleasant drafts you might feel—especially on windy days.

By minimising drafts, you not only make your home more comfortable but also reduce your heating costs and lower your carbon footprint. Heating accounts for over a third of the UK’s emissions, so improving energy efficiency at home benefits both your wallet and the environment.

How to Prevent Cold Drafts from Your Chimney

If you suspect your chimney is a source of heat loss, there are two main ways to address the issue: installing a chimney draught excluder or fitting a chimney cap.

1. Install a Chimney Draught Excluder

A chimney draught excluder is a simple yet effective solution that prevents warm air from escaping while stopping cold drafts from entering. These devices can be installed inside the chimney or around the fireplace opening and are one of the most cost-effective ways to improve your home’s warmth.

Prices for chimney draught excluders start at around £20, but the savings can be substantial—potentially reducing your heating bills by up to £90 per year. You have a couple of options:

• Inflatable Chimney Draught Excluders – These fit snugly inside your chimney and help block airflow. However, they must include a small vent to allow for minimal air circulation.

• Custom-Fitted Draught Excluders – Made from breathable materials like wool, these allow air to pass through while keeping heat inside.

A crucial reminder: Always remove the draught excluder before lighting a fire, and don’t forget to take it out on Christmas Eve to avoid obstructing Santa’s arrival!

2. Fit a Chimney Cap

Another effective option is installing a chimney cap, which is typically made from terracotta or metal. A chimney cap not only reduces drafts but also offers additional benefits, such as keeping out moisture and preventing birds from nesting inside your chimney.

While chimney caps provide long-term insulation, they are more expensive, with costs starting at around £150. Additionally, installation should be carried out by a professional to ensure it is fitted securely and safely. When hiring a tradesperson, keep these tips in mind:

• Ask for recommendations from friends and family.

• Check if they are members of a reputable trade association.

• Obtain at least three quotes before making a decision.

Additional Ways to Reduce Drafts in Your Home

FAQ

Final Thoughts

If you’ve been struggling with a cold draft in your home and suspect your chimney is the culprit, taking action can make a noticeable difference in your comfort and heating costs. Whether you opt for a chimney draught excluder or a fitted cap, addressing chimney drafts is a smart investment.

Want expert advice on draught-proofing your home? Get in touch with our team at Lord-Sykes Property Service, and we’ll be happy to help you make your home warmer and more energy-efficient.