How To Build A Partition Wall In A Finished Room

In this article, we’ll show you how to build a partition wall in a finished room. Partitioning your room will allow you to divide the space into two smaller rooms. This is helpful if you have multiple uses for a room but don’t want to close off the entire area with a wall. For example, imagine that your living room doubles as both an office and a living area. If you want to make it look less cluttered, you can put up a partition wall and turn half of the room into an office space for work or studying.

Cut the Wall

  • Using a laser level, mark the wall at the height of your existing ceiling. If you don’t have one, use a measuring tape to mark out straight lines across the room.
  • Use a saw to cut through the drywall at each of your marks until you get to where an additional partition will be built.
  • Remove all of the drywall down to bare studs with a chisel or hammer until both sides are clear and you can see where they meet in the middle — this is necessary so that when new studs are added later on, they’ll be at least 3 inches apart (to meet code requirements).
  • Once all of your old drywall is removed, use nails from your nail gun or barbed wire staples from your staple gun (depending on what kind of material you’re using for insulation) to secure new sheets into place over top of them (if there aren’t any runners attached yet).

Shoe Molding

While shoe molding is often used to cover the gap between the floor and baseboard, it can also be used to cover gaps between walls or ceilings. You may find this type of trim necessary if you have a room that has two different types of flooring, such as hardwood and carpet.

If you are looking for an alternative material to wood, there are vinyl shoe molds available that provide an even more durable finish.

Removing a Door

  • Remove door, door frame and hardware.
  • Remove door casing.
  • Remove jamb casing.
  • Remove trim and baseboard around wall opening (if any).


Insulate your partition wall before the drywall is installed. This will help keep the room more comfortable in the winter and cooler in the summer, resulting in lower energy costs. Use closed-cell foam insulation like Roxul Safe’n’Sound or GreenFiber EcoWool to reduce sound transfer between rooms as well as heat transfer through your walls.

To insulate properly, first measure each stud bay with a stud finder so that you know exactly how wide to cut your insulation pieces. Then install metal support studs on either side of each bay before attaching them with screws every 6″ or less (it’s best not to use glue for this part of construction). Once all of your metal studs are installed and secured with screws, attach boards made from 1/2″-thick plywood overtop using 2 1/2″ nails spaced every 12″, then cover everything once again using 1/2″-thick plywood sheets attached vertically (known as furring strips) along the edges where they meet existing walls within 10 feet around it (do not install furring strips above 6 feet high). Then cover all exposed surfaces with closed-cell foam insulation

Take care not damage existing walls while cutting out square openings; use clamps if necessary so they don’t fall down during construction process.”

Drywall Installation

Drywall Installation

The first step in installing a partition wall is to install the drywall. Drywall is a type of plasterboard that’s used to make walls and ceilings. If you’re not familiar with it, don’t worry—you can easily learn as you go! The best way to install drywall is from the top down, so that any mistakes can be fixed before you get too far along. You’ll want to make sure that your cuts are straight; if they aren’t, it will be hard for them not to show through later on.

Make sure that you read all instructions carefully before beginning this project; if done incorrectly or without proper attention paid, the results could be disastrous (and expensive). To cut through sheets of drywall, use a drywall saw; this tool has teeth like a hacksaw blade and works similarly but will produce cleaner cuts than regular saws would allow. For smoothing out rough edges between sheets of board after installation has been completed (but before painting), use an old credit card or similar thin object made out of plastic–it should fit into any gaps found between pieces without damaging either material involved in those joints.”

Caulking and Trim

Caulking is the sealant that fills in gaps between the wall and the floor, ceiling and door. Caulking is typically used on plastered walls, but can also be used to fill in gaps on drywall walls. When caulking, use an applicator to apply caulk into the gap you’re sealing off.

If you are sealing off a seam between drywall sheets or plastering over an existing seam between two pieces of drywall, install one piece as normal with screws (or nails). Then apply caulk to the edge where they meet so that when you place your second piece down it should fully cover all exposed seams between those pieces.

For sealing around doors: Use enough caulk along each side of your door jambs to make sure that no water can penetrate through cracks here (causing mold growth). If there are any cracks visible before installation then simply fill them up with more caulk after installing both pieces together (this may require re-installing one or both halves depending on how much gap there was). Make sure not to get any excess onto surfaces you don’t want covered over since caulking dries quickly.

You can transform a finished room into two smaller rooms.

You can divide a finished room into two smaller rooms by building a partition wall. This is a great way to make the most of your space, or create an extra bedroom in your home.

You will need:

  • A stud finder (you can rent one from most hardware stores)
  • Screw gun with drill bit attachment
  • Measuring tape and level (optional)


As you can see, the process to build a partition wall in a finished room is not as complicated as it might seem. Thanks to this guide, you have all the information necessary to transform your living space and adapt it to your needs. Don’t forget that the entire project will take around 8 hours, so make sure you give yourself enough time for it.

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