All you need to know about the wall replacement and replacement with rolled steel joist (RSJ) beams, including costs of wall removal, RSJ installation, labour and time frames.
Installing a rolled steel joist (aka RSJ) is a job that is done when constructing a property or during later structural alterations, most commonly the removal of a load-bearing wall. Installing a rolled steel joist is not usually a standalone job with a single cost, usually it is done as part of another job. Installing an RSJ should not even be attempted without first consulting a structural engineer to do the necessary calculations to determine the correct size of steel beam required for the project. This involvement of a structural engineer will be a requirement to get building regulations approval and the actual installation of the RSJ should be done by an experienced builder as this requires real skill and any mistakes could compromise the structural integrity of the property. In other words, forget cutting corners to save cash and contemplating a DIY job - just pay a fair price for reputable professionals to do the job properly and safely, or potentially face some expensive repairs and safety issues down the line.
Before getting a quote for a rolled steel joist installation, you need to understand that installing an RSJ correctly requires careful calculations by a structural engineer and a skilled builder. In addition, the work will create a great deal of mess which will not only require a lot of cleaning up, but will require some re-plastering and re-decorating once the beam has been installed. The bulk of the work can be handled by an experienced local builder, in fact, some building contractors may also have structural engineers in-house, along with electricians and plumbers so they can handle the complete job from start to finish, with the exception of the final decorating work. This type of work creates a great deal of noise, dust and disruption over several days. So you may want to consider finding alternative accommodation while the work is being carried out.
The cost of installing a rolled steel joist will vary depending on your location in the UK, the size of the beam, access to your property and whether any utilities need to be relocated. But typically, a rolled steel joist installation will cost somewhere between £1,600 and £2,500 including the structural engineer, application for building control approval, skip hire, plastering, labour and materials for the installation. Although, usually the quotes you get will be for more than just the rolled steel joist itself and will typically involve removing a wall or other building work. You will sometimes need a quote for the RSJ installation itself if the builder cannot do this part of the job.
One RSJ can cost as little as £200 itself, however higher quality joists will cost more, along with the number required for a project, can increase the cost proportionally. There will also be a requirement for other parts to ensure that the joist is correctly holding the load - this can also vary depending on the circumstances of the wall removal/replacement in question.
Below are some estimated costs of Rolled Steel Joist (RSJ) Installation.
|Job Description||Avg. Cost||Duration|
|Knock Down Internal Load-bearing Wall and Install 3m Rolled Steel Joist||£2,500||1 week approx.|
|Knock Down Internal Load-bearing Wall and Install 5m Rolled Steel Joist||£3,000||1 week approx.|
|RSJ Supply-Only Cost||£55 per metre||1-3 days for delivery|
|Supply and Fit Only - Average 3m RSJ||£1700||1-2 days|
Individual costs of installing an average 3m Rolled Steel Joist (RSJ) - Total Cost: £2,500