A granny flat is the most-asked-about building in South Africa that nobody can price for you over the phone. The range is genuinely enormous — industry cost guides put a conventional Gauteng build anywhere from about R250 000 to over R1 000 000 — because "granny flat" covers everything from a converted garage to a two-bedroom cottage with its own kitchen.
Here is how to narrow that down to a number you can actually plan around.
What you are actually buying
A granny flat — a second dwelling or secondary dwelling in municipal by-law language — is a self-contained home on a stand that already has one. Self-contained is the operative word: its own bathroom, its own kitchen, its own entrance. Strip any of those out and it is a room, not a dwelling, and both the municipality and your future tenant will treat it differently.
That definition is what drives the cost. The bathroom and kitchen are the expensive parts, and they cost roughly the same whether the unit is 18 m² or 60 m².
Conventional build versus a delivered unit
| Conventional build | Delivered unit | |
|---|---|---|
| Typical outlay | R250 000 – R1 000 000+ (Gauteng guides) | From R 199 900 ex VAT |
| Quoted as | A rate plus a scope | A price for a finished unit |
| Time on your property | Months | Hours to a few days |
| Layout freedom | Whatever you can draw | Catalogue sizes |
| Final cost known | At the end | Before you order |
| Can it leave with you | No | Yes |
Our expandable homes are the range bought for this job. The compact 18 m² at R 199 900 ex VAT is not a bare shell — it includes a bathroom and a small basic kitchen, with 75 mm EPS insulated walls, vinyl flooring, double-glazed windows and factory-installed plumbing and electrics. The 37 m² at R 329 900 adds two bedrooms and a full stainless-steel kitchen; the 74 m² at R 599 900 goes up to four bedrooms.
All of those arrive as one module and expand on site within hours. Where a conventional granny flat means months of trades in the garden, this is a delivery.
What the municipality needs from you
This is the step people skip, and it is the one that can stop the project. A second dwelling touches two separate questions:
- Zoning — does your stand's zoning permit a second dwelling at all? Some do, some allow it only with consent, some do not.
- Building plans — municipalities generally require approved plans for a second dwelling, and views differ on relocatable structures. Coverage limits, height and how close to a boundary you may build all come into it.
Both are decided by your local authority, not by a national rule and not by us. Phone your building control department before you commit — it is a free call and everything else depends on it. If you are in a complex or estate, your body corporate or HOA rules can be stricter than the municipality's. We supply the unit's dimensions and specifications for your submission. There is more detail in where can you put a housing pod, which covers plans, foundations and site access in full.
Does it pay for itself?
Often, and this is the real reason the search volume is what it is. Run the arithmetic yourself rather than trusting anyone's headline yield:
- Find what a comparable self-contained unit actually lets for in your suburb — not the city average. Search current listings, not agent estimates.
- Subtract what it costs you to run: rates impact, insurance, maintenance, and the months it stands empty between tenants.
- Divide the total delivered-and-connected cost by the annual net figure. That is your payback in years.
- Ask what the same money does elsewhere over the same period before you commit it to a building.
Two honest caveats. Rental income is not guaranteed, and a unit that is not approved is harder to let, harder to insure and harder to sell. And a granny flat put up for family rather than income does not need to pay back at all — the value is that someone has their own front door.
Which size to choose
- One person, or a parent nearby — the 18 m² compact at R 199 900 ex VAT. Self-contained, and the smallest footprint that still counts as a dwelling.
- A couple, or a lettable unit — the 37 m² at R 329 900: two bedrooms, a fitted bathroom and a full kitchen. This is the size most rental demand sits at.
- A family, or a permanent second home — the 74 m² at R 599 900, with layouts up to four bedrooms.
- A guest suite rather than a let — an Apple Cabin from R 449 900 ex VAT, if the unit is going to be looked at as much as lived in.
See the sizes, what is fitted in each, and what the extras cost.
Expandable homesQuick answers
Conventionally built, industry cost guides put a Gauteng granny flat somewhere between about R250 000 and R1 000 000 depending on size and finish. As a delivered unit, our expandable homes start at R 199 900 ex VAT for a self-contained 18 m² with its own bathroom and a small basic kitchen. Add transport, groundwork and service connections to either figure.
Sources
Figures we quote from outside our own price list, and where they came from. Prices for our own units come from the same catalogue the product pages use.
- Cost of building a 1-bedroom house (granny flat) in South Africa — KanduaIndustry cost guide used for the conventional-build range quoted here. Contractor-sourced estimates, not official statistics.
- What it costs to build a house in South Africa — ooba Home LoansCross-check on conventional rand-per-square-metre rates.
- Plans and minor building work — sans10400.co.zaBackground on when building plan approval is required. Your municipality makes the final call.
Price one, or come and see one
The quote builder prices a specific configuration in a couple of minutes. Or book a free viewing and walk through the units at our showroom in Centurion — no deposit, no obligation.