Can I Remove My Own Lath and Plaster Walls Without a Tradie?

In many cases, yes — a NZ homeowner can remove their own lath and plaster walls without hiring a tradie, but there are several critical checks you must make before swinging a hammer. Getting these wrong can be costly, dangerous, or even illegal, so read on before you start.

First Things First: Is the Wall Structural?

The single most important question is whether the wall is load-bearing. Removing a structural wall without proper support can cause serious damage or collapse. Signs a wall may be load-bearing include:

• It runs perpendicular to floor joists
• It sits above a foundation wall or beam
• It supports another wall or roof structure above

If you're unsure, consult a Licensed Building Practitioner (LBP) or structural engineer before touching anything. You can find qualified professionals at Licensed Building Practitioners or search for a local demolition contractor on tradedirectory.co.nz.

Do You Need a Building Consent?

This depends on what you're removing and why. Under the Building Act 2004, some minor demolition work is exempt from building consent under Schedule 1, but this has limits. Generally:

• Removing a non-structural, internal lath and plaster wall in a residential home may qualify as exempt work
• Removing a load-bearing wall almost always requires a building consent
• Any work that affects fire separation, weathertightness, or means of escape will likely need consent

Always confirm with your local council before starting — rules vary by region and property type. The MBIE Building Performance website has detailed guidance on consents and Schedule 1 exemptions.

Critical Warning: Asbestos in Lath and Plaster Homes

This is the most serious hazard you face. Homes built before 1990 — and especially those built before 1980 — may contain asbestos-containing materials (ACMs). In lath and plaster construction, asbestos can be found in:

• The plaster render coat (mixed with fibres for strength)
• Textured or "stipple" finishes
• Backing boards and linings nearby

Disturbing asbestos without proper controls is illegal and extremely dangerous. Before any demolition, you must have the material tested by a qualified asbestos assessor. If asbestos is found, removal must follow strict guidelines set by WorkSafe NZ. Friable or high-risk asbestos removal must be carried out by a licensed asbestos removalist — this is not DIY territory.

Checking for Hidden Services

Lath and plaster walls often hide:

• Electrical wiring — do not cut into walls without checking for live cables. Use a stud and cable detector first.
• Plumbing pipes — especially in walls near kitchens, bathrooms, or laundries
• Gas lines — less common inside walls but possible

Electrical work is restricted work in New Zealand. Only a registered electrician can disconnect, alter, or reconnect wiring. See EWRB for what homeowners can and cannot do. Similarly, any work on gas or plumbing connections must be carried out by a licensed tradesperson registered with the Plumbers Gasfitters & Drainlayers Board.

How to Remove Lath and Plaster Safely (DIY Steps)

Once you've confirmed the wall is non-structural, consent-exempt, asbestos-free, and clear of hidden services, here's the general process:

1. Protect the area — lay drop sheets and seal doorways with plastic sheeting to contain dust
2. Wear PPE — P2 dust mask (minimum), safety glasses, gloves, and long sleeves
3. Score and break the plaster — use a hammer and cold chisel or a multi-tool to break the plaster in manageable sections
4. Remove the laths — pry them off the studs using a flat bar; work carefully to avoid damaging adjacent framing
5. Check the framing — inspect studs and noggings for damage, rot, or borer before proceeding
6. Dispose of waste responsibly — lath and plaster rubble is heavy; hire a skip bin and check with your local council about disposal requirements

Tools You'll Need

• Hammer and cold chisel
• Flat pry bar
• Multi-tool or reciprocating saw
• Stud finder and cable/pipe detector
• Heavy-duty rubbish bags or skip bin
• P2 respirator, safety glasses, gloves

What Comes Next?

Once the wall is down, you'll likely need to:

• Patch the ceiling and floor where the wall met them
• Reline with plasterboard if you're building a new wall — GIB is the leading NZ plasterboard brand with good DIY guides
• Have electrical work inspected if any wiring was disturbed — this requires a registered electrician

When to Call a Professional

Call a licensed demolition contractor or builder if:

• The wall may be load-bearing
• Asbestos is suspected or confirmed
• Hidden electrical, plumbing, or gas services are present
• A building consent is required
• The scope of work is large or the home is heritage-listed

A qualified demolition contractor will handle consents, asbestos testing, safe disposal, and structural considerations efficiently. Find one near you on tradedirectory.co.nz.

Sources & Further Reading

• MBIE Building Performance — Building Consents & Exemptions
• WorkSafe NZ — Asbestos Guidance
• Licensed Building Practitioners
• EWRB — Electrical Restricted Work
• BRANZ — Building Research
• Plumbers Gasfitters & Drainlayers Board