Multifamily Housing: How Architecture Creates Value

Multifamily housing is a residential building typology composed of multiple autonomous and independent units—typically apartments—that, when designed with architectural rigor, gains value through functional layouts, strategic solar orientation, private outdoor spaces, qualified communal areas, energy efficiency, and a careful selection of durable materials.

A multifamily building is not merely the arithmetic sum of square meters or apartments: when thoughtfully designed, it creates real and sustainable value for developers, investors, buyers, residents—and the urban fabric of the city itself. This value stems from architectural decisions: how spaces are organized, how the structure responds to its context, how it optimizes thermal and acoustic comfort, and what visual identity it projects.

At MJARC Arquitetos, we view multifamily housing as an opportunity to design qualified, durable buildings that are perfectly adapted to the new demands and experiences of contemporary living.

Fundamental Principle of Residential Design:

The quality of a multifamily housing project is not measured by the raw number of apartments, but by how each unit is experienced and how the building establishes a lasting relationship with its place.

What is multifamily housing?

Multifamily housing encompasses buildings designed to accommodate multiple households in independent, autonomous units. This typology ranges from small boutique condominiums to large residential blocks, high-rise residential towers, or urban rehabilitation projects in historic city centers.

Unlike a single-family house (designed tailored to a single household), a multifamily project requires balancing multiple factors simultaneously:

• Privacy and acoustic insulation between units;

• Quality and dignity of shared entrances and communal spaces;

• Constructive efficiency and structural rationality;

• Harmonious relationship between the facade, public space, and the street;

• Durability and ease of long-term maintenance.

Density is not synonymous with quality

A frequent mistake in real estate development is treating collective housing exclusively as a mathematical exercise in maximizing gross floor area. Density is necessary for urban sustainability, but it is not sufficient on its own: a development can feature many units and yet offer a poor living experience—lacking natural light, having labyrinthine corridors, undervalued common areas, and an undifferentiated aesthetic.

Architecture is the technical tool that transforms density into quality of life. Each unit must ensure generous natural daylight, visual privacy, cross-ventilation, and flexible floor plans ready to accommodate remote work and diverse lifestyles.

The 6 pillars that create value in a multifamily building

The commercial and asset valuation of a residential building relies on six strategic pillars:

To understand how these requirements are articulated from the early stages of design, read our article on architectural schematic design.

Rehabilitating instead of building from scratch: assets with history and future

The rehabilitation and conversion of unfinished or obsolete structures represents one of the most sustainable and cost-effective strategies in multifamily housing: it reduces carbon footprint, streamlines municipal licensing timelines, and regenerates consolidated urban centers.

Case studies developed by MJARC Arquitetos illustrate this methodology:

Torre Green View (Covilhã)

The Torre Green View project originated from an unfinished concrete frame abandoned since the 1970s, transforming it into a contemporary residential landmark. In continuous dialogue with the landscape of Serra da Estrela, the design reused the existing volume, avoiding massive demolitions while integrating cutting-edge bioclimatic solutions. The project received an Honorable Mention at the International Architecture Awards 2026 in the Multi-Family Housing category.

Riverside Condominium (Santa Comba Dão)

By repurposing much of the load-bearing structure and circulation cores, this project transformed an incomplete development into a high-energy-efficiency residential condominium with a strong connection to the river and its natural surroundings, demonstrating the economic potential of circular economy in construction.

In established urban contexts, rehabilitation can also benefit from substantial tax incentives. Learn more in our article on tax benefits in ARU and ORU zones.

Sustainability integrated into sustainable buildings

Sustainability in a multifamily building should never be treated as an afterthought or a catalog of technical equipment added late in the process. Rather, it begins with the correct site placement, compact massing optimization, natural cross-ventilation, and low-impact material selection—fundamental principles for creating sustainable and efficient buildings.

Early integration of these strategies ensures superior energy ratings and simplifies compliance with statutory requirements set by ADENE. Consult our guide on ADENE fees and energy performance certificates.

Common mistakes to avoid in multifamily developments

To protect commercial viability and project reputation, developers and investors should avoid recurring pitfalls:

• Maximizing unit counts at the expense of natural daylight and room proportions;

• Designing floor plans with dead space or awkward layouts that are difficult to furnish;

• Compromising the usable depth and privacy of balconies and terraces;

• Treating entry halls and landings as leftover spaces lacking natural light or architectural dignity;

• Overlooking acoustic insulation between floors and adjoining apartments;

• Selecting low-grade finishes that trigger premature maintenance and degrade the building’s market image.

To ensure your licensing timeline is managed effectively, read about how long a building permit takes in Portugal and the statutory requirements for the prior communication of site opening.

MJARC Arquitetos’ Approach

At MJARC Arquitetos, we combine conceptual creativity with technical and financial rigor. We analyze the target buyer profile, local municipal planning regulations (PDM), and value-creation opportunities for each plot or existing building, delivering developments that balance aesthetics, profitability, and resident well-being.

Frequently asked questions about multifamily housing

• What formally defines a multifamily residential building? It is a building comprising two or more independent, autonomous units intended for housing, sharing structural elements, accessways, and communal services.
• What is the primary difference between single-family and multifamily housing? A single-family house is designed for one household and does not feature condominium common areas. Multifamily housing articulates private autonomous units with shared circulation and communal building systems.
• How does architecture enhance the sales value of residential units? Architecture boosts value per square meter by creating functional layouts without wasted space, securing generous natural light, integrating private balconies, and delivering a refined contemporary aesthetic.
• Is it worthwhile to rehabilitate older buildings or unfinished structures for housing? Yes. Rehabilitation leverages existing load-bearing structures, speeds up urban planning approval processes, and unlocks substantial tax incentives in established urban areas.
• When should an architecture firm be involved? Ideally during early feasibility studies and site analysis, enabling validation of building heights, buildable capacity, and optimal unit distribution before land acquisition.

Legal framework and technical standards

• General Regulations for Urban Buildings (RGEU) — General rules on habitability, daylight, and ventilation.
• Decree-Law no. 555/99, of December 16 — Legal Regime of Urbanization and Building (RJUE), as amended.
• Decree-Law no. 163/2006, of August 8 — Accessibility Regime in collective residential buildings.
• Decree-Law no. 220/2008, of November 12 — Fire Safety in Buildings Regime (SCIE).

Note: The content of this article is for general informational purposes only and does not replace consultation with applicable legislation, relevant municipal master plans, or technical advice from qualified architects and engineers.