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What does it cost to remove a wall between kitchen and living room?

One question moves the price more than anything else: does the wall carry any load? A light partition is a manageable job. A load-bearing wall is sometimes several times more expensive — it's the beam and the engineer that move the figure.

The price depends first and foremost on one question

There is one question that moves the price of removing a wall between a kitchen and a living room more than anything else: does the wall carry any load? The difference between "no" and "yes" is not a few percent. It is a multiplier.

If the wall carries nothing, the job is demolition and making good — work that can be scoped fairly precisely in advance. If it does carry load, the house's weight has to be routed around the opening you are making. That is normally done with a steel or glue-laminated timber beam, built into the wall and resting on new bearing points at each end, which has to be calculated by an engineer before anyone touches the wall. That calculation and that beam are what drive the cost up.

You cannot decide the question yourself, and no app can decide it for you. Wall thickness, the direction of the floor joists, and whether the wall continues through the storeys above and below are clues, not answers. The final assessment has to be made on site by a building surveyor or a structural engineer. Breaking through a load-bearing structure also usually needs approval before work starts — what is required depends on where the home is, and the local building authority will normally tell you free of charge.

The light partition: five line items, and the fifth is the big one

If the wall between kitchen and living room is a light partition — typically 7–12 cm thick, in plasterboard or a timber frame — the work breaks down into five things:

• Demolition and dust protection. The demolition itself is quick; sealing off the rest of the home is not. Dust from a plasterboard wall finds its way through an entire flat if a temporary dust wall isn't built first.
• Waste removal. A three-metre partition produces more debris than people expect. A skip and tip fees are their own line item.
• Electrical work. There is almost always a socket or a switch in the wall, and it has to be either safely capped off or rerouted to another wall. That work has to be carried out by a licensed electrician.
• Making good the ceiling and walls. There will be a scar in the ceiling and two vertical scars on the end walls, where the wall used to meet them. They have to be filled, sanded and painted — and the paint rarely stops at the scar, because a freshly painted patch in the middle of an old wall stands out.
• The floor. This is where the budget most often jumps, and it is the one of the five items you can work out precisely in advance.

Leaving the floor aside, an ordinary plasterboard wall between a kitchen and a living room is, in most markets, one of the cheaper jobs on this list — but that is a statement about relative scale, not a price. Access, which floor you're on, whether there's a lift, and whether you're living in the home while the work happens all move the figure more than the length of the wall does. Get quotes from local contractors before you set a budget.

The floor is the hidden line item — and it can be worked out in advance

There is almost never floor covering underneath a wall. There is a scar the width of the wall, typically 8–12 cm, and in many houses two different floors on either side: tiles in the kitchen, wood flooring in the living room. In practice that means "remove the wall" often turns into "new flooring across the whole combined room".

The sum: The kitchen is 12.4 m², the living room is 23.8 m². Combined, the room becomes 12.4 + 23.8 = 36.2 m², and the scar left by the wall adds 3.2 m × 0.10 m = 0.32 m² on top. So flooring is needed for 36.5 m², not the 23.8 m² you were picturing when you looked into the living room.

Multiply the 36.5 m² by whatever price per square metre your local flooring supplier quotes you, and you have the figure that decides how big the project is. On most wall-removal projects, the floor is a bigger line item than the demolition. If, on the other hand, the old floor already runs unbroken beneath the wall and it's the same floor in both rooms, you get away with sanding and refinishing that one strip — and the line item nearly disappears.

That is exactly the figure a measured floor plan gives you. If you scan or draw the home in HouseSense, the area of every room is shown, and the takeoff adds up the square metres for the room that results once the wall is gone. Then you can work through the cost before you call anyone.

The load-bearing wall: what gets added on top

If a load-bearing wall has to come out, a set of line items appears that simply don't exist for a light partition. These are why the bill can run to several times as much:

• A structural engineer. The calculations have to be done before anything else — you cannot get a real contractor's quote without them, because nobody knows how heavy the beam needs to be until they're done.
• Approval. An opening in a load-bearing structure usually needs approval in advance. What is required, and what it costs in fees, depends on where the home is.
• Temporary propping. The storey above has to be supported while the wall is out and the beam is not yet in place.
• The beam itself. A steel joist or a glue-laminated timber beam. The price climbs steeply with the span — it is not a straight line.
• Bearing points and foundations. The beam has to rest on something. Sometimes there is enough masonry already; sometimes new piers have to be built, and in the worst case the foundation beneath them has to be strengthened too.
• Casing the beam. Fire regulations and appearance mean a steel beam normally has to be boxed in afterwards.

Added together, this means a load-bearing wall between kitchen and living room in a detached house more often turns into a far bigger project than people expect when they start with the sentence "we just need a wall knocked down". It is not scope creep along the way — it is a different job altogether.

Five things that move the price the most

1. The span. Every extra metre of clear opening needs a heavier beam, and the price of a beam rises faster than its length. A column, or a short stub of wall left standing in the middle, can change the figure noticeably — ask the engineer whether a slightly narrower opening makes a difference before you commit to a completely open span.
2. What sits above. A wall with a light roof void above it is a different job from a wall with a full storey plus a roof above it.
3. Access. A six-metre steel joist weighs several hundred kilograms and has to get into the living room. If there isn't room to carry it in, you need a crane, or the beam has to be split and joined on site.
4. What's inside the wall. Electrical cabling is almost always there. Water and drainage in a kitchen wall is a line item of its own, and underfloor-heating pipes in the scar beneath the wall are another.
5. Whether you're living there during the work. Staged work with dust walls and a daily clean-up costs noticeably more than an empty home — budget for something in the order of an extra fifth on top.

How to get a quote you can trust

Contractors add a margin for uncertainty when they can't see what they're walking into. What narrows the spread between quotes is documentation. Bring four things when you ask for a price:

1. A measured floor plan of the rooms on both sides of the wall, with dimensions and areas. HouseSense produces this as a PDF from a scan or a drawing.
2. The wall's three measurements: length, thickness and room height. These decide both the amount of demolition and the size of the beam.
3. An engineer's assessment, if there is the slightest suspicion the wall is load-bearing. Without it, every quote is a guess.
4. The square-metre figure for the floor in the combined room, and a decision on which flooring will go down.

Ask for at least three quotes, and ask for them broken down by line item — demolition, beam, flooring, electrical, painting. One single total figure can't be compared with anything. Five lines can.

And hold on to the one assumption that matters most: what it costs to remove the wall is something you can price out. Whether it's load-bearing is not something you can work out from home. That is decided by a building surveyor or an engineer who has seen the wall.