Here's what you need to know before undergoing a building project with a contractor but no architect.

When not in use during winter, the tub is hidden from the home’s view. The entrance has a sheltered overhang for car parking.

“I love the house more each day,” says Tamami Sylvester of her and husband Michael's home by Sebastian Mariscal in Venice, California. The kitchen, which includes all Miele appliances, is sheathed in custom woodwork from Semihandmade. Accessories from A+R complement the Caesarstone countertops and Franke faucet. A LifeSource Water System provides filtration. Photo by Coral von Zumwalt.

Six-inch-square blue tiles cover the walls and floor of the girls’ upstairs bathroom. The towels and rug are also by H&M Home.

"How would a kid draw a house?" architect Per Franson asked himself when designing the Olivero-Reinius family home. The simple prefab structure’s unusual color comes from a traditional source: falu rödfärg, the historic mineral paint that gives the region’s famous barns their red color.

After renting in San Francisco for a decade, DIY couple Molly Fiffer and Jeff Waldman bought 10 acres in the Santa Cruz Mountains, where the pair and their friends built a cabin compound complete with sheds, tree decks, a pavilion, a wood-fired hot tub, an outhouse, and an outdoor shower. The cabin is made from locally sourced, rough-sawn redwood, which the couple stained with nontoxic Eco Wood Treatment to give the panels an aged appearance and a dark patina.

Architect Gustavo Costa calls the home library the “project’s heart.” This central space houses the owner’s expansive collection of about 5,000 books, and acts as a meeting place for friends and colleagues. A Gerrit Thomas Rietveld Red and Blue chair completes the space.

5. "What are the top 10 most important things I must have in a home?" "If there are two people buying the home, write your answers down separately, starting with your absolute must-haves," Hoffman explains. “Putting together a list separately can give both parties and the realtor a clear picture of what the perfect home will have for both of you."

An outdoor shower was the family’s first construction project. “Doing the shower made us realize we can build things the way we want to build them,” says Meg.

“We sought to create a house that would not damage the environment and not be too visible,” says architect Tina Gregorič. A single zigzagging roof stretches over 5,380 square feet, doubling the area of the interior spaces and serving as an ideal spot for sunset cocktails and whale-watching.

He worked around existing oak and eucalyptus trees for the new building, and retained the vernacular of an original barn, at right, where Frankel hosts concerts. Check out MVRDV's Balancing Barn.

If you’re traveling to Puglia in Italy, one of the most iconic sights are trulli (trullo is the singular), an ancient hut that's specific to the Itria Valley in the Apulia region of Southern Italy. Made with dry stone, trulli date back to medieval times.

The courtyard is just one of many open spaces that will be highly utilized—in the non-winter months anyway. Concrete worked well with developing the language of FlatPak. The second level is a wood panel that can be clad in corrugated metal or cedar—different layers that can be plugged in like covers on your cellphone.

The kitchen is situated in a sunken basement, underneath the staircase’s walnuts steps. The same joiner who built the house’s timber elements built the white cabinetry which are finished in a 40% gloss lacquer. Silestone countertops and integrated appliances maintain the space’s simple lines. Additional storage is fitted under the staircase.

Located on a steep site with limited suitable building ground, the firm decided to cantilever the home over the hillside, which has the effect of helping the structure blend in with the landscape.

A view of the sauna building before the patio and seating were constructed on the other side. The log cabins were constructed by a specialist company, and another builder helped with the interior walls. Jussi-Pekka and his father did all the other building and landscaping work, apart from the electrical and plumbing—often working 12-hour days.

At night, the exterior screen provides privacy when the house is illuminated.

In Montara, California, architect Michael Maltzan designed a home for, his sister and brother-in-law. From certain vantage points, the home’s unique angles result in M.C. Escher–like optical illusions.

"The building form was intentionally asymmetric and clad in hand-stained, split-face shakes and metal," says Campos Studio.

The architects inserted skylights in an artful pattern in the rooftop.

The ADU stands ready for guests—and the owners to use as a temporary home during renovations of the main house.

The Perch at sunset.

The wood-wrapped tiny home features a deck pierced by a tree trunk.

The steel structure is suspended two feet above the roof of the existing bungalow, supported by four steel columns, one of which screens utility lines running from the Perch to the house below.

Looking back to the rear of the sauna and guest bedroom from the field. The large windows not only invite the view inside, but also reflect the landscape and allow the built forms to dissolve.

A pop of red distinguishes the front door, paired with vertical cedar siding with an ebony stain, and Richlite panels and detailing.

Utility equipment and storage is hidden in the hexagonal "systems ring" below the living space modules.

Architectural designer Sebastian Mariscal and project manager Jeff Svitak created a house in Venice, California, for Michael and Tamami Sylvester. Known as Dwell Home Venice for its role as an exemplification of modern architecture, the house is an homage to indoor-outdoor living. Photo by Coral von Zumwalt.

A Simple Plan A Marmol Radziner–designed prefab house, trucked onto a remote Northern California site, takes the pain out of the construction process.

"We imagined how six people would use the space and developed the shape accordingly," says Hello Wood cofounder Dávid Ráday. "We took inspiration from the design of space capsules, and the cabin was refined step by step before reaching its final form."

Simple wood and brick contrast the industrial character of the concrete and steel, while also serving as sound dampeners.

The exterior features vertical, untreated cedar panels. “We tried to use materials that are beautiful in their natural state without excessive treatment or finishing,” Pavonetti says.

The reclaimed hickory facade of the Micro Cabin by BC-OA is punctured by windows that overlook National Forest Service land.

Architect Sven Matt mixed basic shapes with rich details in this Austrian home. The lattice shell was hewn from silver fir sourced from a nearby forest. Eternit shingles clad the roof.

A guest bedroom, with furniture from Room & Board, overlooks the bridge above the dining courtyard. The home’s landscape architecture is by Ventura, California–based Jack Kiesel. Photo by Coral von Zumwalt.

Architect Minwook Choi’s 710-square-foot Seroro House rises from a tiny urban lot in Seoul that had long been neglected because of its challenging size.