The JBCC Principal Building Agreement (currently Edition 6.2, May 2018) is the South African industry-standard building contract. It is drafted by the Joint Building Contracts Committee — a non-profit body representing architects, engineers, quantity surveyors, builders and specialist trades — and it is balanced enough that the high court treats deviations from it with suspicion.

If your builder offers you a "simple one-page contract" instead, that is itself a red flag.

Below are the clauses that matter most for residential homeowners, with what they actually mean.

Clause 3 — Site possession

JBCC requires the employer (you) to give the contractor exclusive possession of the site from a defined date. In practice this means you cannot live in part of the home during the build without writing it into the contract. If you intend to occupy a flatlet or maintain a tenant, say so in Contract Data Item 9 — otherwise the contractor can claim disruption.

Clause 12 — Contract instructions

Only the principal agent (usually your architect) can issue binding instructions. Verbal instructions from you to the foreman are not enforceable. If you want a change, send it to the architect in writing and they'll issue a written instruction with cost and time implications attached.

This is the clause that prevents endless "you said you wanted that, now pay for it" arguments.

Clause 25 — Payment

The principal agent issues monthly payment certificates. Each certificate is "a fair estimate of the value of work executed". You must pay within 7 calendar days of the certificate.

Retention (typically 5%) is held against each certificate. Half is released at practical completion; the rest after the 90-day defects period.

Clause 26 — Adjustment of contract value

This is where homeowners get burned. Changes from the original scope are valued at:

  • Rates in the BOQ where they apply
  • "Fair and reasonable" rates derived from the BOQ where partial matches exist
  • New rates by agreement where no comparable rate exists

If your contract is lump-sum without a BOQ, there are no rates. Every change becomes a negotiation. Always insist on a BOQ.

Clause 28 — Completion

JBCC defines four states:

  • Possession — the date the contractor gets the site
  • Practical completion — the home is fit to be occupied (you can move in)
  • Works completion — all snags resolved, all documentation handed over
  • Final completion — end of the 90-day defects period, final account agreed, final retention released

Most homeowners think "completion = moving in". Legally, you're at practical completion. You don't fully own the project until final completion.

Clause 31 — Penalties for delay

The contract data specifies a penalty per calendar day of delay. The market default is around R 1 500 / day for residential builds; high-end builds run R 3 000 – R 5 000 / day. If your contract leaves this blank, you have no remedy for late delivery — fill it in.

Clause 34 — Termination by the employer

You can terminate the contract for cause if the contractor:

  • Suspends works without justification for more than 10 working days
  • Fails to make reasonable progress
  • Becomes insolvent
  • Materially breaches the contract

You must give 10 working days' written notice to remedy. Don't skip this step — improper termination exposes you to damages.

Clause 38 — Security

JBCC offers three guarantee options:

  1. Fixed construction guarantee (5% of contract value, fixed amount)
  2. Variable construction guarantee (10% reducing to 5% at practical completion)
  3. No security (rare, risky for the homeowner)

For residential work, demand option 2 — a bank or insurance guarantee, not a personal cheque or cash deposit.

What to fill in

The Contract Data is the back of the JBCC document. It's where every variable gets fixed. Don't accept a builder filling these in for you without your sign-off:

  • Item 9 — Site possession
  • Item 12 — Time for completion
  • Item 14 — Penalty for delay
  • Item 21 — Retention %
  • Item 27 — Guarantee type
  • Item 29 — Latent defects period (default: 5 years)

The version that matters

The 2018 Edition 6.2 is currently in force. A 2025 update is in consultation but not yet released as of May 2026. Use 6.2.

Where to get it

JBCC sells the contract through jbcc.co.za. Expect to pay R 600 – R 900 for the Principal Building Agreement plus the Guide to Completion and Payment. It is the cheapest piece of legal protection you will ever buy.

Get a construction lawyer to red-line your filled-in Contract Data before signing. An hour of lawyer time at this stage saves weeks of dispute later.