A developer's guide to common area design in residential buildings

The lobby is the space every resident passes through at least twice a day. It is the building's most consistently experienced common area — and the one that most directly shapes the resident's sense of the building's overall quality. A lobby that feels dark, cramped, or institutional creates a persistent negative impression that no amount of quality in the private units can fully overcome.

Lobby design must balance several competing requirements simultaneously: clear circulation flow from entrance to elevators and stairs, adequate space for package management (a growing functional requirement in urban residential buildings), mailbox placement that does not create congestion, concierge or access control positioning, and an aesthetic that communicates the building's positioning.

Key design considerations

Ceiling height has an outsized effect on lobby perception — even a modest lobby feels generous with adequate ceiling height and good lighting. Natural light, where structurally possible, dramatically improves the quality of the lobby experience. Material selection should prioritize durability in high-traffic conditions alongside visual quality: stone, large-format tile, and quality wood veneers are common choices that hold up well over time.

The quincho is the most distinctively Chilean element of a residential building's common area program. It is also the space that generates the most co-owner conflicts when poorly designed — disputes over smoke, noise, cleaning responsibilities, reservation fairness, and capacity are endemic in buildings where the quincho was not designed with sufficient care.

The fundamental design challenge of a quincho is that it must function as a semi-outdoor cooking and social space while respecting the building's other residents. This requires careful attention to ventilation, acoustic separation, and the relationship between cooking, dining, and social zones within the space.

Ventilation is non-negotiable

Insufficient ventilation is the single most common quincho design failure. Smoke management requires either a well-designed natural ventilation strategy or mechanical extraction — and the grill position must be determined in coordination with the ventilation solution, not independently. A grill positioned under a structural beam with no extraction path is a design failure that cannot be corrected after construction.

Capacity sizing

Quincho capacity should be sized relative to the building's unit count and the realistic frequency of use. A building with 120 units needs a quincho that can accommodate a group of 20-25 comfortably — not one that seats 8 in a room designed for 4. Undersized quinchos generate reservation conflicts and resident frustration from the first year of occupancy.

The cowork space has become a standard element of the residential building amenity program in Chile — but many cowork spaces in residential buildings are underused because they were designed as a marketing feature rather than as a functional workspace. A cowork space that residents actually use requires attention to the specific conditions that make focused work possible.

Lighting is the most critical factor

Task work requires adequate, well-distributed lighting without glare on screens. Many residential cowork spaces are lit with the same ambient lighting logic as a social room — which is insufficient for sustained work. Dedicated task lighting at each workstation, combined with appropriate ambient lighting, is the minimum requirement for a functional cowork space.

Acoustic design determines usability

A cowork space that has no acoustic treatment will be dominated by the noise of a single phone call, making it unusable for everyone else. Acoustic panels, appropriate ceiling materials, and the separation of different work modes — quiet individual work versus collaborative discussion — are essential design elements, not optional upgrades.

Shared terraces and rooftops are among the most visually compelling elements of a building's amenity offer — and among the most frequently underused in practice. The gap between the terrace in the sales brochure and the terrace as experienced by residents is often significant. Terraces that lack shade become unusable in summer; terraces without defined zones generate conflict over noise; terraces with high-maintenance planting deteriorate rapidly under the administration's care.

Climate-responsive design

Santiago's climate requires serious consideration of shade in summer and wind protection in shoulder seasons. A terrace without adequate shade structure — pergola, tensile shade sail, or building element — will be used only in the brief spring and autumn periods when conditions are comfortable without intervention. Shade design should consider sun angles across the year, not just at the summer solstice.

Zone definition reduces conflict

Undefined terrace space generates conflict between residents who want to use it quietly and those who want to use it socially. Clear zone definition — a social/gathering area, a quiet seating area, a planting zone — gives residents clear behavioral cues and gives building administration a basis for usage rules.

One of the most consequential decisions in common area design is the allocation of square footage to each space. Too little, and the space is undersized for its function and generates conflict. Too much, and the space feels empty and the building's private unit area is unnecessarily reduced. Getting the program sizing right requires understanding the relationship between unit count, resident demographics, and the intended use of each space.

General sizing principles

Lobby sizing should accommodate simultaneous use by multiple residents at peak times — morning and evening — without creating congestion at the elevator bank. Quincho sizing should be based on a realistic group size for the building's unit count: roughly one seat per four to six units is a common starting point, though building type and resident profile affect this significantly. Cowork sizing should be based on an estimate of the proportion of residents likely to work remotely, not on the total unit count.

Budget allocation guidance

Common area budgets are typically expressed as a cost per square meter of common area, or as a percentage of total construction cost. The right allocation depends on the building's market positioning — a building competing on quality in a premium segment requires proportionally higher common area investment than one competing primarily on price. The key principle is that common area investment should be proportional to the quality level established by the private units.