Removing internal walls is a popular way of increasing the flow of natural light in your home and creating a layout that suits your way of life. But there are vital considerations to be made before you start work. Here’s what you need to know.
It can become necessary to remove internal walls during the renovation of an older property, and older homes have a tendency to lack natural light in some rooms or have a layout that doesn’t suit modern living. Careful planning is required when removing a wall, not only to ensure that it is structurally sound to do so, but also to prevent the loss of any desirable period character.
Do I Need Planning Permission to Remove a Wall?
If your property is listed, then you will need to consult your local planning department, but if not, then you can normally remove an internal wall under your permitted development rights (always check before starting any building work).
However, you may need to make a Building Regulations application. Building control will visit you to inspect the work and, providing you fulfil the requirements, issue a certificate. It would be wise to also consult a structural engineer to design a suitable beam or some other supporting structure so the remaining loads are safely transmitted to the ground.
Does the Wall Protect You from Fire?
Before demolishing an internal wall it’s also worth considering whether it protects you from fire. For example, where the loft has been converted, the walls around the staircases offer protection, allowing you to escape in the event of a house fire. Altering these walls will again require Building Regulations consent, even if they’re not load-bearing.
On a similar basis, should you want to convert the loft in the future, partition walls that separate entrance halls from reception rooms are best left intact, since they form a ready-made fire escape corridor to comply with Building Regulations.
In terraced or semi-detached houses, where new beams need to rest in the party walls that separate you from the neighbours, it’s also advisable to first talk to a specialist Party Wall surveyor to ensure compliance with the relevant legislation.
Can I Get Retrospective Building Regulations Approval?
Cases where there is no evidence of Building Regulations consent having been obtained for structural alterations is not unusual. While there may be no apparent defects, if there is no completion certificate to prove that the work was properly carried out, this could be an accident waiting to happen.
Here, the best course of action is to contact Building Control and arrange an inspection. At worst you may need to obtain a Regularisation Certificate, which is the equivalent to making a retrospective Building Regulations application. This normally requires a certain amount of physical opening up of the work to establish that it is structurally sound and verify compliance; the cost of making good afterwards will be down to you.
The mess of knocking walls down, be prepared for the dust and mess created by knocking through, it is amazing how much is generated during the works.
How Do I Identify a Load-bearing Wall?
Some internal walls are fundamental to the structure of the house, whereas others simply divide up the interior space and are relatively straightforward to alter or remove.
Depending on the age of the property, the internal walls will be built of either solid masonry (brick, block or stone), or of lightweight timber stud or metal frame construction; sometimes a mix of both of the latter. As a rule, older, pre-1970s homes tend to fall in the solid masonry camp (which homeowners tend to prefer because it’s easier to fix things to them and they have better soundproofing qualities).
Can You Tap a Wall to See if it is Load-bearing?
Contrary to popular belief, tapping a wall to see if it sounds hollow is definitely not enough in the way of investigation. Some stud walls are load-bearing. Conversely, solid masonry internal walls aren’t always ‘structural’ — some were built as simple partition walls.
If in doubt, the best advice is to consult a structural engineer or building surveyor, but in most cases it’s best to assume a Building Regulations application will need to be made. To ascertain whether or not a wall is load-bearing, your structural engineer will check whether it is taking the weight of any of the following:
- The roof: In older houses the roof structure often relies on support from an internal wall. More modern roofs with W-shaped roof trusses (introduced in the late 1960s) are designed to span right across the house from the main wall to another without internal support
- The floor: Floor joists rarely span more than about four metres without support from an internal wall or beam. Look for nail runs in floorboards to identify the direction the joists are running in (usually at right angles to the direction of the floorboards)
Other walls: Ground floor walls often continue above as bedroom walls. However, sometimes upstairs walls are offset or supported on a beam. Most modern houses have lightweight stud walls to the upper floors
- External walls: Some old houses rely on internal walls for ‘lateral support’, where the walls help to secure the external walls together.
Considerations to Make Before Removing a Wall.
Building Control normally requires a structural engineer to specify an appropriate beam or lintel, and this should be done before getting quotes from builders so they know how much to charge.
Ensure the below are factored in from the outset:
- You can never overestimate the amount of dust and mess involved with indoor demolition, so it’s worth having the builders erect dust screens across each room
- Check that quoted prices allow for the re-positioning of any radiators, switches and electrical sockets
- Ensure all necessary plastering and decoration to areas of exposed masonry is included in the price
- The old skirting boards should be retained so that everything matches when the joinery is made good
- When a wall is taken out, the new steel beam will have to rest on something at each end, so a small end section of the original wall (known as a ‘nib’) may need to be left in place.
- For new door openings, the upper part of the old wall will be left in-situ above the new opening (known as the downstand). But where an entire load-bearing wall is removed, a ‘clean sweep’ at ceiling level may not be possible as the new beam will normally be visible.
- Bear in mind that steel beams need to be boxed in with plasterboard to comply with fire regulations. If a continuous ceiling is aesthetically important, one solution is to build a new suspended ceiling to conceal the beam.
- Once a wall is removed it often becomes horribly apparent that the floor levels in the newly conjoined rooms either side aren’t perfectly aligned, because they were never designed to meet.
- Even a small difference of a few millimetres will stand out, requiring additional floor levelling work. Similarly, newly exposed wall surfaces may require the attention of a skilled plasterer.
How is a Load-bearing Wall Removed?
Before any demolition work is carried out, the masonry above must be temporarily supported while a slot is cut for the new beam or lintel.
This slot normally needs to extend either side of the opening with a bearing of at least 150mm. To spread the load, additional support will be needed under the ends of the lintel, such as padstone engineering bricks. The new opening can then be cut out underneath.
Bear in mind that party walls in older properties aren’t always ideal for supporting new loadings. For example, some were built one-brick thick (about 100mm), and may not be sufficiently strong for this new role. In which case, it may be necessary to build new brick piers or install steel columns to support the new beam — which could mean having to excavate small foundations internally, adding significant expense and disruption.
How Long Will it Take?
Once you have obtained structural drawings, if required, the whole project should take no longer than a week — although obviously this will vary a little depending on the size of the wall, access etc.
The actual removal of the wall and insertion of a joist can be done in a day or two, while plastering of the newly exposed sections of wall and boxed in joist should take no more than a day. Finally, painting can be carried out.