RSJ Installation Cost

Looking for RSJ beam costs?

Typically, RSJ installation will cost around £1,500 to £2,500 in the UK.

In this guide to installing RSJs, we look at the prices for different RSJ sizes and grades of RSJ, including the costs of hiring a local builder to install the steel support beams.

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But, if you want to learn more about RSJ sizes and prices, including steel beam cost per metre and how to select the right type for your project first, keep reading.

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How Much is an RSJ to Install?

First of all, what does RSJ stand for?

An RSJ, or rolled steel joist, is a steel beam, steel girder, or steel lintel.

There are several types of RSJ, but the most common one by far is the "I" beam, joists used to support structures. Their most common use is for during building extensions or renovating buildings by knocking down walls.

Installing an RSJ may be possible for DIY enthusiasts, but the calculations required to work out the support required are difficult. Building regulations require joists to be sitting on a wall that will bear the load of any structure sitting on top of the joist.

It has to be sitting on a strong concrete block to distribute the weight uniformly. Any quote to install an RSJ should include calculations done by a structural engineer.

The cost of installing an RSJ will vary greatly depending on the size of the beam, your particular property, whether utilities need to be relocated, and where you are based in the UK. This includes the cost of hiring a structural engineer, plastering, skip hire, the cost for building control approval, materials, and labour for the installation.

RSJ Installation Costs

To give you an idea of your total project cost, take a look at this table for installing different types of RSJ and their associated prices, as well as the time required to complete the RSJ installation:

RSJ Costs (Labour and Timescales)

Before getting a quote for an RSJ installation, you need to remember that part of installing an RSJ is the expert calculations required from a structural engineer. Plus, you then need a skilled builder to carry out the work properly to the engineer’s calculations.

Note also that this type of work will always create a huge mess, no matter how careful the builders are. This mess will require a lot of cleaning and usually also some re-plastering and re-decorating.

Most of the work can be carried out by an experienced local builder, but you will also need a structural engineer and possibly an electrician and a plumber, depending on the location of the RSJ. Most people handle the final decorating work themselves, but some will also need the services of a painter and decorator.

The labour costs for installing an RSJ depend on the size of the job at hand. A single doorway 1m RSJ costs around £400 to £450 for labour, a double doorway 2m RSJ costs around £550 to £600 for labour, and a large open plan 4m RSJ cost around £700 to £800 for labour.

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RSJ Prices (Supply Only)

If you are looking for the cost of an RSJ alone, you may want to know how much a steel beam RSJ costs per metre. An RSJ costs approximately £50 to £100 per metre.

You can purchase an RSJ as supply only, however, it is not recommended that you take on the job of installing the RSJ by yourself. The calculations involved with installing an RSJ are complex, and only a professional can provide the appropriate calculations on how much weight can be distributed across your RSJ.

The table below indicates the supply-only costs for different elements you may need for an RSJ job:

Additional RSJ Costs

There are a number of additional costs that may come up during an RSJ installation job.

The main additional costs that may pop up with this type of work are listed below:

• Structural Engineer - Hiring a structural engineer is an important step that should be taken before you hire a builder to install an RSJ as they will carry out the RSJ calculations for safe installation. The cost of structural engineers per day is around £450 in the UK, but the exact price will be determined by how long you need their services for.
• Wall Demolition — You may need a wall or two demolished in the process of your project to open up an area, or to start off an extension or loft conversion project. The average cost of demolishing a wall is typically £1,200 to £1,750, but varies depending on the scale of the demolition - if the wall in question is load-bearing, your costs will be higher, as detailed below.

• Removing a Load-Bearing Wall - Load-bearing walls require a structural engineer's calculations to ensure there is support in place once the wall has been taken away. The cost of removing a load-bearing wall can start at £3,000+ depending on the size of the area you're removing and the complexity of the job.
• Removing a Partition Wall - Similar to simply demolishing a wall, a partition wall is a room separator that doesn't carry any structural weight. The cost of removing a partition wall is lower as a result, being around £1,750.
• Re-Plastering — Fresh walls need some TLC, and re-plastering a small room will cost around £390 to £510, taking no more than a day.
• Re-Decorating — Once your walls have been re-plastered, you'll want to add some personality back into them. Painting a small room will cost around £150 to £200 per day, but if you'd prefer having wallpaper installed, this will cost £300.
• Skip Hire — You'll need something to take care of the rubble and waste that comes with home renovations. A one-week skip hire will cost you around £200 to £250.

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What Impacts RSJ Costs?

There are several factors that may affect the cost of your RSJ installation cost. This can include the size of the RSJ, the location of your home, ease of access to your property, and whether utilities need to be moved.

The size of the RSJ can affect the installation. The bigger the RSJ beams, the more the total job is going to cost. The RSJ costs around £50 to £100 per metre, so you can see how the length of the beams needed can greatly affect the overall cost of the job.

The location of your home can affect the cost of an RSJ installation. If you live in London, you can expect to pay around £200 to £300 more for the RSJ installation than if you were to live in the north of the UK.

The ease of access to your property can affect the cost of an RSJ installation. If your property is difficult to access, the installation will take a lot longer to complete than if your property is easy to access. This will result in the overall cost of the job being higher due to the additional labour costs and the extra complexity of the job.

If utilities need to be moved in order to install the RSJ, you may need to think about the additional costs of hiring a plumber or an electrician. A plumber tends to charge around £30 to £50 per hour for their work, and an electrician usually charges around £25 to £40 per hour.

What are the Benefits of an RSJ?

There are a number of benefits to installing an RSJ. The main advantages of installing an RSJ are listed below:

Eco-Friendly

Steel is well-known for being eco-friendly, which is why steel is used for a lot of building projects. There are no limits on the number of times that RSJ beams can be recycled, which means there's a lot less waste than if other materials were to be used.

The material is also regarded as being very eco-friendly because it doesn’t emit any greenhouse gases. In addition, steel RSJ beams are extremely cost-effective compared to other materials, such as wood and concrete.

Strength

Steel is incredibly strong. It is capable of bearing more weight and stress without compromise than a beam made out of alternative materials, such as concrete or wood.

Modern buildings are often constructed with steel frameworks because they are incredibly strong and able to withstand extreme weather conditions, such as earthquakes and hurricanes.

Durability

RSJ steel beams are incredibly durable. Wood and concrete beams are nowhere near as tough in composition as steel. Steel beams are also resistant to fire, don’t require any chemical treatments, and are also resistant to termite damage.

Longevity

Steel can last for an incredibly long time, especially in comparison to other materials. The load-bearing design of RSJ steel beams means that they are basically indestructible to constant weight.

Different Types of RSJ

There is a wide range of different RSJ beams available. The following list explains a little about the different types and the pros and cons of each type.

Universal Beams

Universal beams are good for many different types of construction. They are safe and durable and come at a low cost.

They are often referred to as "I" beams, due to their I-shaped appearance. Universal beams are most commonly used horizontally to support floors or roofs in building structures.

Pros

• ✔ Safe
• ✔ Durable
• ✔ Low-cost
• ✔ Lightweight
• ✔ Flexible

Cons

• ✖ Can rust over time
• ✖ Can weaken over time
• ✖ Conducts heat

Universal Columns

Universal columns are great for a variety of construction purposes. They are safe, durable and eco-friendly and come at a low price in comparison to other materials.

Universal columns are commonly referred to as "H" beams due to their H-shaped appearance. These columns are mainly used in structural applications.

Pros

• ✔ Safe
• ✔ Durable
• ✔ Low-cost
• ✔ Recyclable
• ✔ Lightweight

Cons

• ✖ Can weaken over time
• ✖ Conducts heat
• ✖ Conducts heat

Double Beam

A double beam is similar to a universal beam, only the beam part is doubled, which makes this beam stronger and able to withstand more weight. Double beams are used for purposes similar to universal beams to support floors and roofs.

Pros

• ✔ Safe
• ✔ Durable
• ✔ Low-cost
• ✔ Lightweight
• ✔ Flexible
• ✔ Extra Strong

Cons

• ✖ Can rust over time
• ✖ Can weaken over time
• ✖ Conducts heat
• ✖ Bulky

Channels

A channel is a C-shaped beam that comes in various sizes and thicknesses. The shape of this type of beam provides superior structural support.

This makes it an ideal product for frames and braces on buildings and structural support applications.

Pros

• ✔ Strong
• ✔ Safe
• ✔ Durable
• ✔ Superior structural support

Cons

• ✖ Can rust over time
• ✖ Can weaken over time
• ✖ Conducts heat

T-Beam

A T-beam is most commonly constructed using reinforced concrete. Sometimes, isolated T-beams are constructed to increase the compression strength of concrete. T-beams offer an extra layer of strength for structural purposes.

Pros

• ✔ Adds extra strength
• ✔ Better head room
• ✔ Structural support

Cons

• ✖ Requires strong bonding
• ✖ Can become weak
• ✖ Can develop cracks

Lintels

Lintels are horizontal beams that are placed over doors and windows. These can be made from timber, stone, brick, steel, or reinforced concrete.

Pros

• ✔ Protects doors and windows
• ✔ Safe

Cons

• ✖ Can become cracked
• ✖ Can weaken over time

Do I Need an RSJ?

Building any structure is a complicated process as so many things need to be considered.

If you are considering removing a wall from your home, consulting with a building company or a structural engineer is important.

This professional will then inspect your home to see what you are looking to do and advise on the correct procedures needed to carry out a safe job.

This includes support of the ceiling and roof. If you plan on removing a wall, you will most likely need to put an RSJ in its place to support the upper floor. A rolled steel joist will support the area above the wall you are taking out, similar to how the wall was when it was there.

If you are unsure if you need an RSJ for any work that you are carrying out on your home, you should consult with a building professional or a structural engineer. They will be able to advise you on the best route to take when it comes to renovating your property.

What is a Load Bearing Wall?

A load-bearing wall is a wall that is an important structural element of a building. This means that it bears the weight of the elements of the wall above it.

The above wall rests on a load-bearing wall by conducting its weight to a foundation structure. Load-bearing walls typically run parallel to the ridge.

Building Regulations When Installing an RSJ

If you are creating a new building, installing fittings or windows, or extending or structurally altering an existing building, you will need to gain building regulations approval. This is not the same as planning permission.

Depending on the type of building you are working on and the type of work that you are carrying out, you may also need to gain planning permission.

If you are the owner of the property that is having work done, you are responsible for ensuring your builder complies with building regulation rules.

All calculations for RSJ beams must be sent to a building control officer who will sign off the building regulations approval.

The building control officer will check that the calculations and provisional building work plans comply with the building regulations.

Can I Install an RSJ Myself?

Installing an RSJ is definitely not a DIY project. It should not even be attempted without hiring a structural engineer first for the necessary calculations to determine the correct size of the steel beam required.

A structural engineer will be required for building regulations approval, and then the actual installation should be done by an experienced builder. This is because if there are any mistakes or corners cut, you could compromise the structural integrity of the property.

There are some parts of the job that you may be able to complete yourself in order to save some money, such as removing waste or re-decorating. However, the main aspect of the job should be left up to the professionals to ensure that everything is done correctly and to ensure that the completed job is safe.

If you are a qualified builder yourself, you may have the right knowledge and experience to carry out the work yourself. If this is the case, you will still need to obtain the relevant building regulations approvals. However, you could save around £400 to £800 on the cost of labour.

Cost of RSJ Removal

You may want to remove an RSJ if you are re-building a supporting wall, or if you are knocking down the wall above the steel beam. Another reason you may want to remove an RSJ is to replace it with another one or to replace it with a different kind of support beam.

Removing an RSJ is not an easy job and should be done safely and with great care. If you are unsure of what is required of the job when choosing to remove an RSJ, you will need to consult with a structural engineer to advise on the best method for removing your rolled steel joist.

If you are removing a rolled steel joist, you will need to consider if you need to replace it with some other kind of support. If there is still a bearing load above where the RSJ was, you will need to replace the RSJ with some other form of support, such as a wall or another support beam.

A builder will charge you around £20 to £35 per hour for the labour of removing your RSJ. There are also some other costs that may become involved in the job of removing an RSJ.

Waste removal is something that you may need to think about. A one-week skip hire will cost you around £200 to £250.

Re-decorating a small room will cost around £150 to £160 per day. Also, re-plastering a small room will cost around £390 to £510 and should take no more than a day.

Checklist: Hiring an RSJ Installer in the UK

There are a number of points that you will need to consider when hiring an RSJ installer.

Below are some of the major things that you should think about when looking for the right contractor or company for the job:

• Do you have the correct measurements as taken by a structural engineer to complete the job?
• Have you or your builder acquired the relevant building regulations approval?
• How many years’ worth of experience does the builder or company have?
• You should gather at least 3 three quotes to compare them and ensure you are paying an appropriate cost for the work at hand.
• You should ask for a cost breakdown on your quotes so that you can ensure you are paying a good price for each of the different elements of the job.
• Does the builder or company you are hiring offer any guarantees or warranties with their work?
• Does the company offer additional services such as cleaning up, waste removal, re-plastering, and re-decorating?

Sources

https://theconstructor.org/structural-engg/types-beams-construction/24684/
https://diligentdevelopments.co.uk/remove-load-bearing-walls