When it comes to making structural changes in your home or commercial property, safety and accuracy are absolutely essential. One of the most critical aspects of major renovations or extensions is installing Rolled Steel Joists – commonly referred to as RSJs. These beams carry heavy loads and create open-plan living areas, room extensions, or new layouts without compromising the integrity of your building.

At TD Property Renovations, we specialise in professional RSJ installations across all types of building projects. With years of hands-on experience, we understand what’s at stake when it comes to structural support, and we ensure every project is completed to a high standard, in full compliance with UK building regulations.

What Is an RSJ and Why Is It Needed?

An RSJ (Rolled Steel Joist) is a heavy-duty steel beam designed to bear loads where a supporting wall is removed or modified. Whether you’re knocking through a wall to open up your kitchen-diner or building a large rear extension, RSJs play a key role in keeping your home or premises structurally sound.

Using the right size, specification and placement of RSJ beams is not just good practice—it’s a legal and safety requirement. Poorly installed RSJs can lead to structural movement or worse, so it’s critical to work with experienced professionals who know how to liaise with building control and structural engineers.

Our Approach to RSJ Installations

We don’t believe in one-size-fits-all solutions. Every RSJ installation starts with a thorough inspection of your property and a review of architectural or structural plans. We work with qualified structural engineers to ensure the right beam is chosen, and we’ll handle everything from temporary supports to final fitting and making good.

Here’s what our process includes:

• Initial assessment and consultation

• Coordination with engineers and building control

• Safe removal of walls (where required)

• Temporary support installation

• RSJ beam fitting and structural adjustments

• Final finishing, plastering, or aesthetic restoration

Where Are RSJs Commonly Used?

RSJ beams are frequently used in domestic and commercial building projects, including:

• Kitchen and living room knock-throughs

• Rear and side extensions

• Loft conversions

• Garage conversions

• New builds

• Shop or office refits

If you’re unsure whether your renovation will need an RSJ, we’re happy to assess the project and advise accordingly.

10 Common Questions About RSJ Installations

1. What does RSJ stand for?
RSJ stands for Rolled Steel Joist. It’s a strong steel beam used to support structures where walls have been removed or altered.

2. Do I need planning permission to install an RSJ?
Typically, you don’t need planning permission for RSJs, but you do need building control approval. We handle all the necessary paperwork.

3. Can I install an RSJ myself?
It’s highly recommended that only experienced professionals install RSJs. Incorrect installation could cause serious structural damage.

4. How much does RSJ installation cost?
Costs vary depending on beam size, access, and project complexity. We offer transparent quotes tailored to your specific requirements.

5. How long does an RSJ installation take?
Most installations take 1–3 days depending on the scale of the work. We minimise disruption wherever possible.

6. Will I need a structural engineer?
Yes. A structural engineer will calculate the correct size and specification for your RSJ. We can organise this as part of our service.

7. Is an RSJ visible once installed?
It can be, but many clients choose to box it in or plaster over it for a clean finish. We offer both visible and concealed options.

8. Are RSJs only for big projects?
No. Even small layout changes might require RSJ support if load-bearing walls are affected.

9. How do I know if a wall is load-bearing?
We can inspect your property and determine whether a wall supports upper floors or the roof. Never assume a wall is safe to remove without checking.

10. Will the RSJ rust over time?
RSJs used indoors are typically primed or painted to prevent rust. We ensure all beams meet current building standards.

Why Choose TD Property Renovations for RSJ Installations?

We bring the right mix of knowledge, craftsmanship, and care to every project. Our team works closely with engineers, building control, and you – the client – to ensure your vision becomes reality, without compromising safety. Whether it’s opening up your ground floor or undertaking a larger development, we provide reliable structural support you can trust.

Ready to start your renovation? Get in touch with TD Property Renovations today to book a site visit or request a free quote.