Arquitetura Nacional Fits a Porto Alegre Law Firm into 100 m² with Oak Storage Walls and Exposed Copper Pipes

Moving a law firm into a smaller office is usually a story about loss: fewer rooms, fewer shelves, less room to breathe. When Escritório Piratini, a practice specializing in real estate law, relocated its headquarters to a 100 m² commercial unit in a new building in Porto Alegre, the space it left behind was roughly half as large again. Arquitetura Nacional, with lead architect Lucas Pessatto, was asked to make the smaller footprint work as hard as possible and to let it be partitioned to suit the way the lawyers actually operate.

The interesting thing is how the studio did it. Instead of carving the plan into small cellular rooms, the architects pushed storage into thick oak walls, set a veined marble block at the entry as the office's single heavy object, and left the concrete ceiling bare so that the building services, run in copper, could become the decorative layer. The result is an office where almost every surface either stores something, divides something, or carries something. In a law firm, where paper still accumulates faster than anyone admits, that discipline matters.

A Marble Threshold Instead of a Lobby

There is no waiting room here, only a vestibule, and the architects compensate with material weight. A veined marble block works as both reception counter and partition, and it carries the formality a legal practice expects without spending floor area on it. A tufted bench, a flush white pivot door and the cool concrete soffit complete a compact arrival sequence that reads as deliberate rather than squeezed.

The branching copper chandelier, built from the same pipe vocabulary as the services overhead, is the one moment of flourish. It shows that the studio understood the entry as the place to spend its expressive budget, and we think that was the right call. Clients form their impression in the first three metres, and those three metres are carefully composed.

The Oak Wall Does the Planning

The key move is a long oak storage wall lining the corridor from reception inward. Tall pivoting doors swing open to reveal shelves of books and files, then close flush so the corridor reads as one continuous timber surface. Because storage lives in the wall's thickness, the rooms on either side are free of freestanding cabinets, which in an office this size is where usable area would otherwise disappear.

The wall also acts as a guide through the plan. Walking past it, you are led toward the marble block and the glowing chandelier, so the corridor feels like an approach rather than leftover circulation. One element solves storage, wayfinding and finish at once, and that kind of efficiency is what a tight brief rewards.

Copper Services as Ornament

Exposed ceilings in fit-outs are often just a way to avoid paying for a suspended one. Here the decision goes further. The sprinkler lines are run in copper, clamped to orange steel brackets, bent at visible elbows and hung against raw concrete. Up close, the details show real care: clean hangers, crisp turns, and a narrow glass strip separating the top of the oak joinery from the ceiling plane so the cabinetry never quite touches the structure.

That glass gap is easy to miss and does a lot of work. It lets the joinery read as furniture placed inside a concrete shell rather than as built-up walls, and it keeps the copper runs visible along their full length. The services become a drawn line through the office, tying the reception, corridor and workrooms together overhead.

Workrooms Built Around Paper

The work areas keep a quiet palette: white desks, some with curved corners, mesh chairs, white drawer units and oak shelving loaded with binders and archive boxes. Copper-framed tube lights hang in neat rows, and daylight from the roller-shaded windows falls across a pale floor. Nothing here tries to be a lifestyle office; it is a room for reading documents and producing more of them.

What we appreciate is that the archive is not hidden. Filing cabinets, boxed files and even the copier sit in plain view within the same material system as everything else. For a real estate practice, the archive is the business, and the design treats it as part of the architecture rather than clutter to be tidied away.

Meeting Rooms That Fold Open

The brief asked for a layout that could be partitioned to suit the client, and the meeting rooms are where that becomes literal. Folding white panels slide across to divide a larger space into smaller rooms, or fold back to open them up when a bigger meeting needs the area. The photographs show the panels in use, which tells you they were designed to be moved often, not just once at handover.

This is the most practical way to recover some of the area the firm gave up. A space that works as one room or two, depending on the day, is worth more than two fixed rooms that sit empty half the week. Built-in shelving along the walls means even the meeting rooms carry part of the library.

Library Walls and a Marble Kitchenette

Law books turn up throughout the office: on oak-faced shelves with white ledges, behind shared desks, and on white folded-metal shelving beside orange room lettering set into the oak. The lettering is a small graphic touch that picks up the colour of the pipe brackets, and it gives the signage a clear relationship to the rest of the scheme.

The kitchenette repeats the main materials at a smaller scale: a marble splashback lit from below, a round marble table, oak cabinet doors and copper overhead. It is narrow, but it does not feel like an afterthought, which is more than most compact offices manage for the room where staff take their breaks.

Plans and Drawings

The plan explains the strategy clearly: reception, meeting rooms, work areas, pantry and restrooms are arranged along a central corridor, with the storage wall acting as the spine. The circular joinery details show the glass panel fixed in a timber frame, with wiring channels and a recess for an LED strip. They confirm that the gap between oak and concrete was designed from the start, and that the lighting was built into the joinery rather than added afterward.

Why This Project Matters

Plenty of small offices try to look bigger with mirrors, white walls and fewer things. Piratini Office goes the other way. It accepts that a law firm comes with a lot of paper, and it designs the walls to hold it. By putting storage, partitioning and services into a few well-made elements, Arquitetura Nacional frees the floor for work and gives a downsized practice an office that feels considered rather than reduced.

The broader lesson for interior architects is about where to spend effort. The budget here goes into joinery, one marble object and careful service runs, while partitions and furniture stay plain. That hierarchy gives the space a clear identity at 100 m², and it is a useful model for any professional practice being asked to do more with less floor area.

Piratini Office by Arquitetura Nacional (lead architect Lucas Pessatto), Porto Alegre, Brazil. Area: 100 m². Completed: 2017. Photography: Marcelo Donadussi.

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