A kosher sukkah needs at least three valid walls and valid schach above it. The walls do not all need to be complete solid panels, but the sukkah must meet the basic halachic wall requirements.

The minimum usable area of a sukkah is commonly given as seven by seven tefachim. In practical terms, a sukkah should be large enough for a person to sit and eat in a normal way.

A sukkah must be at least ten tefachim high. A very low structure below that height is not considered a valid sukkah.

A sukkah may not be higher than twenty amot. If the schach is above that height, the sukkah is not valid according to the standard halachic requirement.

A sukkah should have the character of a temporary dwelling, especially through its schach. Even if the frame is strong and reusable, the sukkah is still valid when the roof covering is proper schach.

The sukkah should be built in the correct order: first the walls, then the schach. This avoids the issue of making a sukkah by leaving invalid conditions in place and only fixing them afterward.

The frame should be strong enough to remain standing during normal use. A shaky or unsafe structure is not only a practical problem, it can also create halachic concerns if the walls cannot stay in place.

When using an adjustable or modular sukkah, every size configuration still needs to meet the minimum halachic requirements for height, wall placement, and schach coverage.

Sukkah walls may be made from many materials, as long as they are halachically valid and can stand properly in normal wind.

Fabric walls need to be tied or secured well. If the walls flap significantly in the wind, they may not count as valid sukkah walls.

Lavud belts or straps are used to create halachic wall sections when spaced properly. They are especially helpful for sukkahs with fabric walls.

For lavud to work, the gaps between straps or rails must be less than three tefachim. Larger gaps may not create a continuous halachic wall.

The bottom of the wall should not be raised too high above the ground. A gap of three tefachim or more at the bottom can invalidate that wall.

A sukkah wall must reach the minimum halachic height. Even if the wall does not reach the schach, it may still be valid if the halachic requirements are met.

Loose sheets or curtains that move in the wind should not be relied on as sukkah walls unless they are properly secured or supported by a valid lavud system.

A sukkah can have a doorway or opening and still be kosher. The key is that the remaining wall structure must still meet the halachic requirements.

Kosher schach must come from plant material, such as bamboo, reeds, or branches.

The schach must be detached from the ground. Branches that are still connected to a living tree cannot serve as kosher schach.

Schach may not be made from materials that are halachically considered capable of receiving tumah, such as many finished utensils or processed items made for regular use.

A kosher sukkah needs more shade than sunlight from the schach. If there is more sun than shade inside the sukkah, the schach is not sufficient.

The schach should not be so thick that rain cannot enter. Ideally, some sky or large stars should be visible through the schach, though details can vary by case.

A sukkah should not be under a roof, balcony, tree, or overhang. Schach underneath something that blocks the sky may not be valid.

The proper order is to create a valid sukkah structure first and then place the schach on top. This helps ensure the sukkah is made correctly.

Many are careful that the schach rests directly on wood or other materials suitable for schach, rather than directly on metal. If your setup uses metal supports, ask a rabbi how to arrange it properly.

A tree above the sukkah does not become schach. If branches are still attached to the tree, they cannot be used as the sukkah covering.

The area where people eat should be properly covered by kosher schach. If part of the sukkah has invalid covering or no schach, do not assume the whole area is valid.

A sukkah under a balcony, awning, porch roof, or building overhang is usually not valid in that covered area. The schach needs direct exposure to the sky.

Tree branches above the sukkah can create problems even if the sukkah itself is built correctly. Choose a clear location whenever possible.

A porch, deck, driveway, or backyard can be a good place for a sukkah if the space is open to the sky and the sukkah meets the halachic requirements.

A balcony sukkah can be valid, but check for overhead balconies, railings, wind, and schach placement. These setups often need more attention than backyard sukkahs.

If you expand or shrink an adjustable sukkah, recheck the walls, lavud straps, and schach coverage. A valid setup in one size does not automatically mean every other size is valid.

The sukkah should be reasonably usable for eating and dwelling during Sukkos. A location that is dangerous, filthy, or unusable can undermine the mitzvah.

If the sukkah is in a windy location, secure the frame and walls properly. Wind can affect both safety and the validity of the walls.

Fixed meals with bread should be eaten in the sukkah. The blessing of Leishev BaSukkah is generally said when eating a meal that requires sitting in the sukkah, according to one’s custom.

A significant meal of mezonos, such as pasta or other grain-based foods, may require eating in the sukkah. The details depend on the amount and whether it is treated like a meal.

Small snacks and drinks may not require a sukkah, but eating them in the sukkah is still a meaningful way to honor the mitzvah.

Sleeping, even a short nap, is part of the mitzvah of dwelling in the sukkah. In practice, many communities have customs and exemptions, especially where conditions are difficult.

During Sukkos, a person should eat, relax, and spend time in the sukkah in the way he would normally use his home.

Bring nice dishes, table settings, and respectable items into the sukkah. Items that are dirty or degrading should be kept out.

Learning Torah in the sukkah is part of living there. If a person needs unusual concentration or conditions that cannot be met in the sukkah, ask a rabbi how to handle it.

Children who are old enough to understand the mitzvah should be trained to eat and spend time in the sukkah according to their ability.

Different communities have different details about when to say Leishev BaSukkah. Follow your family custom or ask your rabbi.

If rain makes it uncomfortable to stay in the sukkah, a person may be exempt. The exact rule depends on the situation and the type of discomfort.

The rule of mitzta’er means that someone genuinely uncomfortable because of conditions such as cold, heat, insects, or illness may be exempt from the sukkah in some cases.

A sick person may be exempt from sitting or sleeping in the sukkah, depending on the situation. Health and safety should not be ignored.

Not every inconvenience creates an exemption. Normal outdoor discomfort does not automatically remove the mitzvah.

Large decorations hanging far below the schach can create halachic concerns. A common practical rule is to keep decorations close to the schach and not over the eating area in a problematic way.

Decorations are not schach. They should beautify the sukkah without becoming the main covering over the people sitting inside.

Sukkah decorations have a special holiday purpose. They should be treated with respect and not handled casually during Sukkos.

Sukkah laws can be very detailed. If your setup has unusual walls, supports, overhead objects, or tight measurements, ask a competent rabbi before relying on it.