At Cambridge Building Repair, we recently completed a chimney survey for a homeowner on Newmarket Road in Cambridge. The property originally featured two separate fireplaces that had been removed to create more living space. However, these fireplaces converged into a single chimney stack.

With no documentation available to confirm how the masonry removal was conducted, concerns arose during a homebuyer survey. The lack of structural clarity prompted the new owner to contact us for a thorough investigation. We assessed the situation, identified potential structural risks, and provided a detailed report with remedial recommendations and cost estimates.

Why Chimney Breast Removal Surveys Are Important

Chimney breasts are frequently removed in older homes across Cambridgeshire for various reasons:

1. To create additional living space.

2. To install modern heating systems.

3. To enhance open-plan layouts or provide extra storage.

While the chimney stack above the roofline is often left intact, the loft space typically supports the remaining structure. When such alterations are carried out improperly—without structural expertise or adherence to Building Regulations—they can create serious safety risks and complicate future property transactions.

Common Safety and Compliance Issues

Historical Practices

In the past, chimney breasts were often removed without adequate support for the remaining structure. Between the 1970s and 1990s, builders frequently relied on gallows brackets, which were widely accepted by Building Control Authorities at the time. Unfortunately, these brackets are now considered inadequate due to their weakness under compression forces. Most authorities no longer permit their use.

Modern Requirements

Today, any structural alteration must meet Building Regulation standards and include proper certification, even if the work was carried out by previous owners. Unsupported or poorly supported chimney stacks present serious risks, including potential collapse, and can delay or derail property sales.

Reliable Solutions for Structural Safety

RSJ Beams: The Gold Standard for Support

The safest and most reliable solution for supporting a chimney stack is the installation of RSJ (Rolled Steel Joist) beams:

RSJs are installed directly under the stack’s long leading edge.

Beams are supported by load-bearing walls or are designed to integrate into the structure by a qualified Structural Engineer.

If beams rest on a Party Wall, compliance with the Party Wall etc. Act 1991 is mandatory.

How We Can Help

At Cambridge Building Repair, we specialize in chimney surveys and structural assessments across Cambridge and Cambridgeshire. Our services include: 1. Comprehensive inspections to determine the condition and support of chimney structures.

2. Identification of risks such as unsupported stacks or outdated gallows brackets.

3. Guidance on achieving compliance with Building Regulations.

4. Design and installation of reliable support systems, including RSJ beams.

Protect Your Property and Your Investment

If you suspect that your chimney breast has been removed improperly, or if you're planning to sell or renovate your property, a professional survey is essential. At Cambridge Building Repair, we provide the expertise and solutions to ensure your property is safe, compliant, and ready for the future.

Contact us today for expert chimney surveys and structural advice you can trust.