Removing Load-Bearing Walls: Cost, Process, and What to Expect

Knocking through a load-bearing wall is the most common structural intervention on South African homes. The job is well-understood but full of small decisions that swing total cost by thousands.

Typical cost breakdown

• Structural engineer calculations: R8,000–R16,000
• Steel beam (supply and install): R24,000–R70,000
• Builders work (props, demolition, making good): R50,000–R110,000
• Local Authority Building Control fees: R8,000–R14,000
• Total typical: R90,000–R210,000

Costs rise with span (long beams), access (upstairs work, restricted entry), and finishes (matching original mouldings, full re-decoration).

The process

1. Engineer attends site, takes measurements and loads (~1 hour)
2. Calculations produced (1–2 weeks)
3. Local Authority Building Control submission (1 week to approve)
4. Site work: temporary propping → cut opening → install beam → make good (5–10 working days)
5. Local Authority Building Control inspections at key stages

Steel beam sizing

Beams are sized to span and load. Typical residential ranges:

• 2–3 m span, internal: 152×89 UB or 203×102 UB
• 4–5 m span: 254×102 UB or 305×127 UB
• External walls (taking roof + floor + wall above): up to 356×171 UB

Padstones (concrete pads) distribute the beam end-load into the supporting walls. Don't skip them.

Common surprises

• Chimney breast above the wall needing separate support
• Plumbing or wiring running through the wall to relocate
• Foundations under bearing positions needing upgrade
• Asbestos in older artex or insulation

DIY warnings

Don't remove anything without engineer's calculations and Local Authority Building Control approval. The wall above will not collapse instantly — it will deflect, crack ceilings, and eventually fail. Insurance claims for unauthorised removal are routinely declined.

MCFAR provides fixed-fee load-bearing wall calculations including Local Authority Building Control submission.

Frequently Asked Questions