In 1955 a typical Semaphore house was about $7,500, or 4.4 years of an average wage. In 2026 it is about $1.02M, or 10.3 years. Here is the decade-by-decade version, what was standing when, and what her block does now.
Modelled, not measured. Prices are the Adelaide median house price of the day (rounded, dollars of the day) scaled to where Semaphore sits against the city median in 2026, blended toward the median for earlier decades because suburbs move up and down the ladder. Wages are national average full-time earnings. Treat every figure as "about". For actual sales history, ask an agent or the state valuer.
Trust homes and fibro on the fringe; stone villas closer in.
Cream brick veneer, one bathroom, a Hills Hoist.
Brown brick project homes, ducted evaporative, a family room.
The ensuite arrives. Colorbond replaces galvanised iron.
Four-two-two under one roof. Rendered feature walls.
Biggest houses in the world. Alfresco and theatre room.
Two-for-one subdivisions start. Solar on a third of roofs.
7-star, all-electric, 300m² blocks. Or a rebuild on Nan's.
Includes ~20% infill that replaced an earlier house.
Rebuild pressure in Semaphore is medium. A knockdown or a subdivision every few streets. Character is shifting but the original stock still dominates. Heritage zoning across the old streets; infill along the edges and near the Port.
Locals know: The foreshore villas were built for sea captains and customs officers. Salt-laden air has been working on them for 130 years.
A typical Semaphore block is 400-700m². Three realistic paths in 2026.
Blocks of 400-700m² in Semaphore are the size developers look for. Two 4-bed homes typically $550K-$750K each to build, before demolition and civils.
Read the guideOne 220-260m² family home on the full block, $520K-$900K depending on builder tier. Keeps the backyard.
Read the guideRoof, rewire, switchboard, salt damp and a bathroom: $60K-$120K to bring an old Adelaide house up to modern comfort.
Read the guideModelled on the Adelaide median of the day and Semaphore's current position relative to the city, a typical Semaphore house was around $11,000 in 1965, or about 3.9 years of an average full-time wage. In 2026 it is around $1.02M, or about 10.3 years of wages. These are indicative figures, not sales records.
Roughly 20% of today's homes in Semaphore are infill: townhouses, courtyard homes or rebuilds that replaced an earlier house. Rebuild pressure is medium: A knockdown or a subdivision every few streets. Character is shifting but the original stock still dominates.
The largest share of Semaphore (35%) is villas and cottages (1850s-1910s). Bluestone or sandstone fronts, brick quoins, slate or corrugated-iron roofs, a bullnose verandah and 3.3m ceilings. Rooms off a central hall.
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