SANS 10400 for Owners

SANS 10400 is the code of practice that tells you how to satisfy South Africa’s National Building Regulations. The regulations say what a building must achieve; SANS 10400 sets out recipes known to achieve it, and the alternative route when you want to do something else.

SANS 10400 for Owners — practical guidance from the team running construction work on the Garden Route. Below is what the structure actually is, the parts that touch a normal house, and the distinction between deemed-to-satisfy and rational design — which is the single thing most owners misunderstand and the one that costs money when it goes wrong.

Regulations, standard, and the difference

Two documents get conflated constantly, so it is worth separating them before anything else.

The National Building Regulations are law, made under the National Building Regulations and Building Standards Act. They are written in functional terms: a roof must be able to resist the loads it will be subject to, a room must have adequate light and ventilation, drainage must convey waste safely. They tell you the outcome required. They do not tell you how to get there.

SANS 10400 is the code of practice that fills that gap. It is published in parts, each lettered to match a regulation, and each part contains deemed-to-satisfy requirements — prescriptive rules which, if you follow them, are accepted as meeting the functional regulation without further argument.

The consequence matters. SANS 10400 is not the only lawful way to build. It is the pre-approved way. If you want to do something the code does not cover, you are not prohibited — you have to demonstrate compliance another way, which is what rational design is for.

Building control at your local authority — George, Mossel Bay, Knysna, Bitou — administers this. They approve the plans, inspect at defined stages, and issue the occupancy certificate at the end. That certificate is what makes occupation lawful, and its absence is what surfaces years later at conveyancing.

SANS 10400 does not stand alone. It refers out to the design standards that do the technical work — SANS 10160 for loadings including wind, SANS 10162 for steel, SANS 10100 for concrete, SANS 10142 for the electrical installation — and to SANS 1200 and SANS 2001 on the construction side. Approval is administered by your local building control: George, Mossel Bay, Knysna and Bitou each run their own, and each has its own submission requirements and turnaround on top of the national regulations. Ask them what they want before the drawings are finished.

The parts that touch a normal house

There are more than twenty parts. On a house, a handful do almost all the work, and knowing which is which lets you read a professional’s advice rather than take it on faith.

Part A — General principles and requirements. Includes the application procedure and the minor-works exemptions. Worth reading, because it tells you what actually needs a plan submission and what does not.

Part B — Structural design. The part that says the structure must be capable of safely carrying its loads, and the part that sends you to an engineer when the deemed-to-satisfy route runs out.

Part H — Foundations. Deemed-to-satisfy foundation rules for normal conditions, and — importantly on the Garden Route — the point at which soil conditions push you out of them.

Part K — Walls. Masonry rules, wall thicknesses, and where reinforcement or engineering is required.

Part L — Roofs. Structural adequacy and weather resistance. Roof trusses, bracing, and the certification of the erected structure.

Part P and Part R — Drainage and stormwater. Where the waste goes and where the rainwater goes. These are what stall plan submissions more often than anything structural.

Part T — Fire protection. Escape, separation and materials. Bites hardest on multi-unit and commercial work.

Part XA — Energy usage in buildings. The compliance submission every new building now needs — orientation, glazing, insulation, and hot water. It is a submission requirement, not a suggestion.

Part	Covers	Where owners get caught
A	Application, procedures, exemptions	Assuming a project is exempt when it is not
B	Structural design	Not realising an engineer is required
H	Foundations	Soil conditions outside the deemed-to-satisfy rules
L	Roofs	No A19 certificate at handover
P / R	Drainage and stormwater	The most common reason a submission is returned
T	Fire protection	Multi-unit and commercial layouts
XA	Energy usage	Left until last, then delays the submission

Deemed-to-satisfy versus rational design

This is the concept worth actually understanding, because it explains most of what your professional team will tell you and most of what a build costs when the ground is awkward.

Deemed-to-satisfy means building within the prescriptive rules in the relevant part. A conventional masonry house on competent ground, with normal spans and a standard truss roof, is largely a deemed-to-satisfy building. Building control can approve it against the code without anyone needing to prove anything from first principles. It is the cheap route because the engineering was done once, nationally, decades ago.

Rational design is the alternative: a competent person — usually a registered engineer — designs the element from first principles and takes professional responsibility for it satisfying the functional regulation. You need it when the deemed-to-satisfy rules do not cover your situation.

On the Garden Route, the trigger is most often the ground. Clay soils inland of George, high winter water tables on low-lying erven around Wilderness, Sedgefield and the Great Brak flats, and steep sites all push foundations outside the standard rules. Retaining walls above a modest height, or any wall carrying a surcharge such as a driveway, do the same. So do long spans, suspended slabs and unusual loads.

Alternative building systems are the third route. Nutec, precast, prefab and modular systems frequently sit outside deemed-to-satisfy because they are not what the rules were written around. Agrément South Africa certification is how those systems demonstrate compliance — an independent assessment against the performance requirements, which gives building control a recognised basis for approval.

None of these routes is a loophole. They are three lawful ways to prove the same thing, and the only real question is which one your building needs.

What actually needs plans, and what does not

Part A carries minor-works provisions, and they are narrower than owners hope.

Definitely needs approved plans: any new dwelling; any addition or extension; anything structural, including removing or altering a load-bearing wall; a change of use; converting a garage into a room; a carport or a covered patio in most cases; a swimming pool; and a boundary or retaining wall above the prescribed height.

Generally does not: internal finishes, replacing like with like, non-structural partitioning, and genuinely minor works — although “minor” is defined by the local authority and it is a question worth asking rather than assuming.

The consequences of building without approval are practical rather than theoretical: a stop order, no occupancy certificate, an insurer with grounds to decline a claim, a bank that will not release funds, and a conveyancing problem the day you sell. Unapproved work is also frequently discovered by the buyer’s attorney rather than by the municipality, which is a worse time to find out.

Inherited unapproved work is a real Garden Route problem — older properties with a carport, a room or a stoep that never went on a plan. It is fixable through an as-built submission, and it is much cheaper to deal with before you list the house than during a sale.

The certificates, and why you want them at handover

A compliant building produces a small stack of paper. Collect it as you go, because assembling it afterwards is far harder and every one of these gets asked for eventually.

Approved plans, stamped by the local authority.

The occupancy certificate, issued after the final inspection. This is what makes occupation lawful and it is the document most often missing on properties that later cause trouble.

The electrical certificate of compliance, and a separate one for any gas installation.

The plumbing certificate, where the local authority requires it.

The roof truss A19 — certification by a competent person that the erected roof structure matches the engineered design and is correctly braced and fixed. Banks, insurers and conveyancers all ask for this, and reconstructing it once the ceilings are up is expensive.

Engineer’s certificates for any rationally designed element.

NHBRC enrolment documentation on a new home. Separate from SANS 10400 and equally compulsory.

The honest reason to insist on all of it at handover is not compliance for its own sake. It is that a property with complete documentation sells without friction, and one without it does not.

How this affects what you should ask a builder

You do not need to know the code. You need to know enough to ask four questions and understand the answers.

“Which parts of this build are outside deemed-to-satisfy?” A builder who cannot answer has not thought about it. On most jobs the honest answer includes the foundations, and sometimes the roof or a retaining structure.

“Who is the competent person, and what are they taking responsibility for?” Rational design means somebody signs. Know who.

“Which inspections are in the programme, and does the programme stop for them?” Municipal stage inspections and NHBRC inspections are fixed points. A builder who treats them as obstacles to work around is telling you something.

“What certificates will I have at handover?” The list above. Get it agreed in writing at the start.

And one thing to be wary of: anyone who describes the regulations as red tape that adds cost. Every part of SANS 10400 exists because of a failure mode that somebody else already lived through — a roof that lifted, a foundation that moved, a fire that spread. The code is a list of things that have gone wrong before.

Frequently asked questions

What is SANS 10400?

It is the South African code of practice for applying the National Building Regulations. The regulations are law and are written functionally — they say what a building must achieve. SANS 10400 is published in lettered parts and gives deemed-to-satisfy requirements: prescriptive rules that are accepted as meeting the functional regulation. Following the code is not the only lawful way to build, it is the pre-approved way; anything outside it needs a rational design by a competent person.

What is the difference between the National Building Regulations and SANS 10400?

The regulations are the law and set the required outcome. SANS 10400 is the code of practice that tells you how to achieve it, part by part. You comply with the regulations either by following the deemed-to-satisfy rules in SANS 10400, or by demonstrating compliance another way — typically a rational design signed by a registered engineer, or in the case of a non-standard building system, Agrément South Africa certification.

What is deemed-to-satisfy?

A prescriptive set of rules that, if followed, is accepted as satisfying the functional regulation without further proof. A conventional masonry house on competent ground with normal spans is largely a deemed-to-satisfy building, which is why it is the cheapest route to approval — the engineering was done nationally, once. When your situation falls outside those rules, you need a rational design instead.

When do I need an engineer on a house?

Whenever the deemed-to-satisfy route does not cover the element. In practice that means: foundations on clay, on made-up ground, on a steep site or where the winter water table is high; retaining walls above a modest height or carrying any surcharge such as a driveway; suspended slabs; unusual spans or loads; and most alternative building systems. The engineer’s fee is small against the concrete and very small against remediating a building that has moved.

Do I need approved plans for a carport or a garage conversion?

In most cases yes for both. A carport is a structure, and converting a garage is a change of use as well as usually a structural alteration. The minor-works exemptions in Part A are narrower than people expect, and the honest approach is to ask your local building control department rather than assume. Building first and asking later is how you end up with an as-built submission during a sale.

What happens if I build without approved plans?

A stop order is the immediate risk. Beyond that: you cannot obtain an occupancy certificate, your insurer has grounds to decline a claim relating to the work, a bank will not release funds against it, and the buyer’s attorney will find it at conveyancing. Unapproved work can usually be regularised through an as-built submission, and doing that before you list a property is far cheaper and calmer than doing it mid-sale.

Does SANS 10400 apply to Nutec, precast and modular homes?

Yes — the regulations apply to buildings, not to wall systems. What differs is the route to compliance. Many alternative systems sit outside the deemed-to-satisfy rules because those rules were written around conventional construction, so compliance is demonstrated through Agrément South Africa certification of the system, or through rational design. That is in addition to plan approval and NHBRC enrolment, not instead of either.

What is an occupancy certificate and do I really need one?

It is issued by the local authority after the final inspection and it is what makes lawful occupation of a new building possible. Yes, you need it. It is the document most often missing on properties that later cause difficulty, and its absence surfaces at the worst possible moment — during a sale, or when an insurer asks questions after a claim.

Related reading

• NHBRC enrolment, explained
• A new build in George, start to finish
• Plans and NHBRC for an alternative build
• JBCC vs NEC4 vs PBA
• Construction company in George