Missing Middle Housing

The
Understory
Collection

Architecture that roots itself quietly in the neighbourhood fabric. Denser than a house, more human than a tower — the vital middle ground that healthy cities are built upon.

Created & developed in partnership with
Saltus
Development
Knighton
Architecture + Planning
Missing Middle — 2 to 8 units
Typologies — Duplex · Fourplex · Courtyard · Row · ADU · Stacked Flat
Saltus × Knighton Architecture + Planning

Housing Typologies

Each entry examines a distinct typology — its form, density, social character, and its relationship to the street and neighbourhood it calls home.

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Duplex · Infill

The Rooted Pair

A side-by-side duplex that mirrors the massing of its single-family neighbours while quietly doubling the density of the block.

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Stacked Duplex · Vertical

The Canopy Stack

Two full-floor units stacked vertically, each with its own entrance — offering the privacy of a house with the efficiency of shared land.

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Triplex · Infill

The Third Ground

A three-unit infill that fits naturally into a standard lot, stepping its massing to maintain neighbourly scale at the street edge.

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Fourplex · Corner

Corner & Ground

A fourplex occupying a corner lot, its massing stepped to address both streets while keeping ground-floor units in close dialogue with the sidewalk.

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Fourplex · Laneway

The Lane Quartet

A front-and-back fourplex that activates the laneway as a shared address, drawing life into the block's interior without touching the main streetscape.

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Townhouse · Row

The Linden Row

A terrace of four townhouses drawing on vernacular traditions, with rear garden suites that add gentle density without altering the streetscape.

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Courtyard · Community

Canopy Court

Six stacked flats arranged around a shared courtyard, creating a semi-private communal landscape that anchors the building's social life.

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ADU · Backyard

The Garden Suite

A compact accessory dwelling tucked behind a heritage home, demonstrating how hidden density can quietly transform a neighbourhood over time.

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Carriage House · Heritage

The Carriage Return

A heritage-sensitive carriage house conversion that adds a full dwelling above a garage, preserving the original structure while unlocking new density.

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Stacked Flats · Midrise

The Brow Building

An eight-unit stacked flat building at the upper edge of the missing middle — ambitious in density, careful in its relationship to the sky and street.

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Mixed Use · Main Street

The Shopfront Flat

Ground-floor retail or workspace with residential units above — a classic main street typology that layers economy and community into a single building.

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Manor House · Large Lot

The Manor Split

A large single-family home sensitively divided into four self-contained units, preserving the building's original presence while significantly increasing its contribution to the housing supply.

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Micro-Suite · Urban Infill

The Pocket Building

A compact urban infill of six micro-suites designed for singles and young professionals — efficient, well-crafted, and quietly radical in how much it achieves on a narrow lot.

Typology range
Missing middle (2–4 units)
Medium density (4–6 units)
Upper middle (6–8 units)

The Middle Ground

The understory of a forest is where the most diverse, adaptive life takes hold — sheltered by the canopy above, rooted in the ground below. This collection borrows that metaphor for housing: the missing middle as a quiet, resilient layer of the city.

"These typologies are not monuments. They are neighbours."

Each design asks how a building can increase density without announcing itself — how it can offer more people a place in an established neighbourhood without displacing what makes that neighbourhood worth living in.

The Understory Collection is an ongoing study — a living document of typologies, ideas, and built experiments in the space between the house and the tower. Developed in collaboration between Saltus and Knighton Architecture + Planning.

Created & Promoted By
Saltus
Development Partner
Bringing missing middle typologies to market — identifying sites, securing approvals, and delivering housing that fits the neighbourhood.
Knighton
Architecture + Planning
Designing every typology in the collection with precision, context, and a deep commitment to human-scale urbanism.
13
Typologies in collection
2–8
Units per project
2
Partner firms
Neighbourhoods it can serve