ResidentialBryanston, Johannesburg · 2025

Bryanston House

Double-volume rear extension

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A two-storey house in dark cladding and timber, lit at dusk, seen across a lawn.
The new rear volume, from the gardenBryanston, Johannesburg

A 1990s face-brick house in Bryanston with a good garden and no way of reaching it. The living rooms sat a metre above the lawn behind a run of small windows, and every route out of the house went the long way round through the kitchen.

The brief was to open the back of the house and add the room the family had been doing without. What that turned into is a two-storey volume across the rear elevation — living space below, opening level with the garden, and two bedrooms over it.

Reading the house first

A living room opening through full-height glazing onto a covered outdoor terrace.
The lower volume, opened to the terraceFull-height glazing, level threshold

The existing house was not the problem. It was well built, and the parts of it that worked — the entrance, the stair, the north-facing bedrooms — were left alone. The survey took a week and settled what could carry load and what could not, which is what decided where the new volume goes.

It sits where the old rear wall was, so the extension inherits the house's own geometry instead of being pushed out at an angle to catch a view. The floor level steps down once, inside, and lands flush with the terrace — the single move that does most of the work.

Three things it had to do

A bathroom with a glazed shower, a floating vanity and matt black fittings.
Upper floor, new bathroomFalls and waterproofing set out before tiling

The extension does three jobs at once, and the detailing had to hold all three without the house reading as two buildings stitched together:

  • get the living space down to garden level and keep it warm
  • add two bedrooms and a bathroom without a new stair
  • leave the front elevation exactly as the street knows it

The third is the one that constrains the other two. Everything added is behind the ridge line, so from the road nothing has happened.

Added and reworked
420m²Added and reworked
On site, occupied throughout
11monthsOn site, occupied throughout
New rear volume
2storeysNew rear volume
Survey to snag list
1teamSurvey to snag list

Built around the people living in it

A structural opening propped and shored mid-build, with rubble and services exposed.A contemporary two-storey house in brick and render, seen from the street.
Propping the opening, month threeThe family stayed in the house throughout

The family never moved out. That is the fact that shaped the programme more than the drawings did: the house had to keep working as a house through eleven months of structural work, so the sequence was built backwards from which rooms had to stay usable in which month.

The rear wall came out in one week, propped and sheeted, with the kitchen isolated behind a temporary partition and running the whole time. Water and power were never off for a full day. Dust was planned for rather than apologised for afterwards.

The join nobody notices

A finished living space in warm neutral tones.
Living space, looking back into the old houseOriginal floor level on the right

The measure of an extension is the line where it meets what was already there. Inside, that line runs through the middle of the living space, and the only thing marking it is the step down. Ceiling, floor finish and skirting all carry through it.

Outside it is a shadow gap, held to the same width the whole way up. It took longer to set out than it did to build, which is the usual ratio for the part of a job nobody is meant to see.

Client
Private client
Scope
Design, structural works, joinery, finishes
Programme
11 months, house occupied throughout
Completed
2025

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