How to Open a Door in a Brick or Concrete Wall

Knocking a new doorway through a brick or concrete wall is one of the most transformative things you can do to a home. It connects rooms, improves flow, brings light through, and can completely change how a space feels to live in. It's also one of the jobs that gets people into serious trouble when it's approached without the right knowledge.

This guide covers what's actually involved, what you need to know before anyone lifts a tool, and where the line is between a job a competent builder handles and one that needs a structural engineer involved.

The First and Most Important Question: Is the Wall Load-Bearing?

Before anything else, you need to know whether the wall is structural. A load-bearing wall carries the weight of the structure above it -- floors, roof, other walls. If you remove a section of it without proper support, the consequences range from cracked ceilings to partial collapse.

In most Berkshire homes -- the 1970s and 1980s semis that make up a large proportion of the housing stock in areas like Winnersh, Earley, and Caversham -- the external walls are almost always load-bearing. Many internal walls are too, particularly those running at right angles to the floor joists or sitting on the foundations.

How to tell: a structural engineer can confirm it definitively. A good builder with experience in your property type can give you a strong steer. What you should not do is assume a wall is non-structural because it looks like a partition or because someone on a forum said so.

Do You Need Planning Permission or Building Regulations?

Planning permission

For an internal doorway in a standard residential property, planning permission is not usually required. The exception is if the property is listed or in a designated conservation area -- both of which apply to parts of Berkshire, particularly around Windsor and some villages in the Wokingham district. Always check before you start if you're in any doubt.

Building regulations

If the wall is load-bearing, building regulations approval is required. This means the work needs to be designed, carried out, and inspected to a defined standard. A structural engineer will calculate the size and specification of the steel or concrete lintel needed to carry the load above the new opening. The building inspector will sign off the work on completion.

This is not optional and it is not bureaucratic box-ticking. The sign-off protects you legally, protects your home, and matters when you come to sell. A doorway opened in a load-bearing wall without building regulations approval is a problem for any buyer's solicitor and surveyor.

What the Job Actually Involves

Once the structural questions are answered and the right approvals are in place, here's how the work typically proceeds:

1. Propping the structure above

Before any masonry is removed, the load above the opening needs to be temporarily supported. Acrow props and a spreader beam take the weight while the lintel is installed. This is the stage that is most often skipped or done inadequately on botched jobs -- and it's the stage that causes the damage when things go wrong.

2. Cutting the opening

The opening is cut in sections using an angle grinder, disc cutter, or masonry saw. Brick and block walls are cut in manageable sections to maintain stability throughout. Concrete walls, particularly reinforced concrete, require diamond-tipped blades and significantly more time and effort -- it's a harder material to work through cleanly.

3. Installing the lintel

The lintel -- typically a steel RSJ (rolled steel joist) or a concrete boot lintel depending on the wall type and load -- is inserted above the opening and bedded into the masonry on both sides. The bearing length on each side matters; the structural engineer's specification will define this. A lintel that's undersized or under-supported will move over time.

4. Making good

Once the lintel is in and the props are removed, the reveal -- the inner face of the new opening -- is plastered and finished. The floor threshold is made good. If the wall was cavity construction, the cavity needs to be closed at the new opening. Then the door frame goes in, the door is hung, and the decoration is finished to match the surrounding walls.

Brick Wall vs Concrete Wall: What's the Difference?

Both are achievable but they're not the same job.

Brick and block walls are the most common in Berkshire residential properties. They cut relatively cleanly, the mortar joints give natural lines to work with, and the process is well understood by any experienced builder.

Poured concrete walls and reinforced concrete panels -- found more commonly in certain 1960s and 1970s system-built properties -- are a different proposition. The reinforcement bars running through the concrete cannot simply be cut without engineering assessment. Cutting through rebar without understanding the structural implications can weaken the wall in ways that aren't immediately visible. This is a job that needs a structural engineer involved from the start, not just for sign-off.

How Long Does It Take and What Does It Cost?

A straightforward doorway in a non-load-bearing brick wall -- cut, framed, made good -- is a one to two day job for an experienced team.

A load-bearing wall with full propping, lintel installation, building regulations involvement, and a quality finish is typically three to five days of work.

Cost in Berkshire for a load-bearing doorway opening, fully completed including structural engineer, lintel, making good and decoration, typically runs from £2,500 to £5,000 depending on wall thickness, lintel specification, and finish required. Non-load-bearing is considerably less -- usually £800 to £1,500.

What to Watch Out For

A few things that catch people out on this type of job:

•      Services in the wall -- electricity cables, gas pipes, and water pipes can run inside walls. Before any cutting, the route of services needs to be checked. A cable avoidance tool is standard practice.

•      Cavity wall insulation -- cutting through an insulated cavity wall releases loose fill insulation. The cavity needs to be closed and the insulation managed at the new opening.

•      Floor level differences -- if the rooms either side of the new door are on slightly different floor levels, the threshold needs careful detailing

•      Dust -- cutting masonry generates significant dust. Proper containment sheeting and dust extraction are essential, particularly in a lived-in home

📞 Thinking about extending your home in Berkshire? Contact Nuova Home Improvements for a free consultation. We cover Reading, Newbury, Windsor, Maidenhead, Wokingham, and surrounding areas.