Structural Opening vs Knock-Through: What's the Difference (and Why It Matters)?

In Edinburgh, "knock-through" gets used for everything  taking a stud wall out, opening up a kitchen, removing a load-bearing wall, even taking out part of a stone tenement wall.

But here's the truth: some "knock-throughs" are simple. Others are structural works that need engineering, temporary supports, and Building Control sign-off.

First: What People Mean by "Knock-Through"

Most homeowners mean: "I want this wall gone so the room feels bigger."

That could be a non-structural partition wall  or it could be a load-bearing wall that's holding up floors, walls, or roof loads above.

A "Simple Knock-Through" (Non-Structural)

This is where the wall is basically a divider  it's not carrying the building.

• Often stud / plasterboard partitions
• Sometimes lightweight internal brick walls
• Usually no steel beam required
• Still messy, still needs proper dust control and waste removal

Even when it's non-structural, you still need to think about electrics, plumbing, ventilation, and making good.

A "Structural Opening" (Load-Bearing)

This is where the wall is doing a job  carrying load from above. Removing it without the right support is dangerous.

A proper structural opening usually involves:

• Structural engineer calculations
• Temporary support (Acrow props / needles)
• Padstones at the bearings
• Steel beam (RSJ / UB) installed to spec
• Building Warrant / Building Control sign-off (most cases)

Why the Difference Matters (Cost, Time, Paperwork)

The difference isn't just "does it need a beam?"  it affects the whole project:

• Cost: engineer + steel + propping + inspections
• Timeline: lead time for calculations and approvals
• Risk: structural work done wrong can damage your property
• Resale: paperwork matters when you sell (surveyors will ask)

The 3 Questions We Ask on Every Enquiry

1. What's above the wall? (another floor? roof? a bathroom?)
2. What type of property is it? (tenement, Victorian, 1930s, modern?)
3. Where do the joists run? (often tells you what the wall is doing)

Edinburgh-Specific Reality Check

Edinburgh homes are varied  and older properties can hide surprises. Tenements in Leith, Stockbridge, and Marchmont often have:

• Thick stone walls
• Old lath and plaster
• Hidden services
• Previous alterations done badly

That's why we always recommend doing it properly  engineer first, then install to spec.