Standard 16" x 22" British Builders Fireplace Opening: The Guide (2024)

Unlocking the potential of your fireplace involves more than just aesthetics. The rectangular opening in your chimney breast serves as the gateway to a cosy, warm haven. In this article, we’ll explore the dimensions, considerations, and steps involved in transforming this space to accommodate a wood-burning stove seamlessly.

Estimated reading time: 6 minutes

Understanding the Builder’s Opening

The typical builder’s opening, prevalent in the UK and Ireland, measures around 22″ in height and 16″ in width, with variations based on the house’s age. Originally designed for solid fuel open fires, this opening incorporated a decorative fire surround and a shaped concrete fireback. Reopening this space for a wood-burning stove requires the removal of the existing fire surround and backplate.

Checking Structural Integrity

Before embarking on the transformation journey, it’s crucial to ensure a suitable lintel is in place. Remove plasterwork above the opening to expose the lintel and inspect the brickwork for stability.

In older houses, mortar joints may have deteriorated due to prolonged exposure to intense heat and acidic condensates from inefficient coal burning. Any loose mortar must be addressed, necessitating brickwork reconstruction.

Related Article: The Ultimate Guide To Chimneys And Flue Systems

Challenges in Fireplace Transformation

Unpredictability in Construction

Estimating the effort required for fireplace transformation can be tricky, as the true state of the chimney breast and lintel only becomes apparent after initiating the project. Unforeseen issues, such as perished brickwork joints, can impact the timeline and cost.

Importance of Flexible Flue Lining

To address potential risks, most stove installations include flexible flue lining. This precaution prevents combustion gases, including carbon monoxide, from leaking into living spaces through compromised brickwork joints.

It underscores the significance of professional assessment and flexible solutions in fireplace remodeling. With a 16″ fireplace opening it is likely that only a 5″ flue system will fit.

Expanding the Builder’s Opening

While the standard builder’s opening suits many inset stoves, it may lack the space required for freestanding stoves with substantial heat output. Adapting to this challenge involves expanding the opening, a task best entrusted to professionals. This process often includes the use of props to maintain brickwork integrity.

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Considerations in Expansion

Expanding the builder’s opening requires attention to detail. For optimal functionality, a larger opening, approximately 900mm x 900mm (3’x3′), is ideal for accommodating stoves with a 5kW output. Leaving a full brick length on each side ensures structural stability, aligning with building regulations and enhancing visual appeal.

What are the best 16″ fires to buy?

Discovering the optimal 16″ fires for your home is made easy with our curated selection at Bonfire. Explore our range to find the best 16″ fires that perfectly blend style, functionality, and warmth, ensuring a delightful addition to your living space.

16″ Wood Burning Fires

Explore the enchanting world of 16″ wood-burning fires at Bonfire, where our curated collection is designed to complement standard-sized builder’s openings of 16″ x 22″ after chairbrick removal.

Immerse yourself in the allure of authentic wood ambiance and sustainable warmth as you peruse our range, ensuring a seamless fit that combines timeless charm with eco-friendly heating. Find the perfect 16″ wood-burning fire to transform your space into a cosy haven that embraces both style and environmental consciousness.

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16″ Electric Fires

At Bonfire, discover a diverse array of 16″ electric fires, meticulously curated to harmonize with standard-sized builder’s openings measuring 16″ x 22″ after chairbrick removal.

Our selection ensures a perfect fit while adding a touch of modern elegance and convenient warmth to your space. Explore the range to find the ideal electric fire that aligns with both your aesthetic preferences and functional needs.

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16″ Gas Fires

At Bonfire, our collection boasts an extensive range of gas fires tailored to perfectly suit a standard-sized builder’s opening of 16″ x 22″, especially after the removal of the chairbrick.

Explore our selection to find the ideal gas fire that not only fits seamlessly but also elevates the aesthetic and warmth of your space.

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What if I want a freestanding log burner?

The opening can be knocked out to house a freestanding log burner as sufficient air is required around the stove. Around 50mm minimum to non combustibles or in accordance with manufacturers guidelines

The following free standing wood burning stoves are designed for a standard 16″ fireplace opening:

• ACR Woodpecker 4 – (Be sure to check manufacturers guidelines with this one)
• Stovax County 3
• Stovax Stockton 3

These are meticulously crafted to seamlessly slot into a conventional fireplace opening measuring 22 inches (560mm) in height and 16 inches (405mm) in width, ensuring a perfect fit once the chairbrick is removed.

Depth and Compliance

The depth of the new opening correlates with the original builder’s opening, typically extending to the back of the wall or party wall. Adherence to Building Regulations Document J (or equivalent) is paramount, encompassing the width and depth of the replacement hearth and the final position of the stove.

Conclusion

Transforming your fireplace opening is a journey that combines aesthetics, safety, and functionality. By understanding the nuances of the builder’s opening, addressing structural concerns, and considering expansion possibilities, you can create a warm, inviting space that aligns with both regulations and your personal style.