How to Build a Shelf
To build a shelf, decide what it will hold, fix a support into the wall studs, a cleat, brackets or a hidden cleat for a floating shelf, and rest a 3/4 in (18 mm) plywood or solid wood shelf on it, with a support at least every 32–48 in (80–120 cm). In a garage, a freestanding plywood shelving unit or cleats on the studs carry heavy boxes; in a corner, cleats on both walls hold a triangular shelf. The shelf span, the board and the load decide how much it sags.
Which kind of shelf?
| Shelf | Holds | Best for |
|---|---|---|
| On cleats | Heavy, if screwed into studs | Closets, garages, pantries, alcoves |
| On brackets | Light to heavy, by bracket | Kitchens, workshops, quick wall shelves |
| Floating (hidden cleat) | Light to medium | Living rooms, decor, books on short spans |
| Freestanding shelving unit | Heavy | Garages, basements, rented homes |
| Corner shelf | Light | Unused corners |
| Built-in bookcase | Heavy | Alcoves and whole walls |
How to build a wall shelf
- Find the studs with a stud finder and mark them; shelves held only by drywall anchors cannot carry much.
- Cut the shelf from 3/4 in plywood or a 1x10/1x12 board, and band or fill the front edge (see how to finish plywood edges).
- Fix the support: a cleat screwed level into every stud with 2 1/2–3 in screws, or brackets at the stud positions.
- Set the shelf on the support and screw down through it into the cleat or brackets so it cannot slide or tip.
- Add a front strip under a long shelf, 1 1/2 in deep hardwood glued on edge: it can double the span before it sags.
For a hidden fixing, see how to build floating shelves and French cleats.
How to build shelves in the garage
Garage shelves carry paint, tools and storage boxes, so build them deep and strong:
- Freestanding unit: two or three plywood sides, fixed shelves 16–24 in deep screwed through the sides, a back or diagonal braces, and the bottom shelf raised off a damp floor. Screw the top to the wall so it cannot tip. Our garage shelving plan adds dividers so no shelf spans more than about 32 in.
- On the wall: 2x4 cleats or ledgers screwed into every stud, with plywood shelves on top and a front 2x4 or posts down to the floor for heavy loads.
How to build a shelf in a corner
Screw a cleat to each wall at the same height, level, into the studs or with good anchors. Cut the shelf from 3/4 in plywood as a right triangle, a quarter circle or a five-sided shape with a straight front, sized so it rests on both cleats. A row of corner shelves 10–12 in apart makes a corner bookcase.
How much can a shelf hold?
It depends on the span, the depth, the board and the load. A 3/4 in plywood shelf 10 in deep stays flat with books on about 30–36 in; MDF and particle board sag sooner and keep sagging over time. Check your shelf before you build:
Frequently asked questions
What is the easiest way to build a shelf on a wall?
Screw a wooden cleat (a 1x2 or a strip of 3/4 in plywood) level into the studs, rest a 3/4 in plywood or solid wood shelf on it, and add a bracket every 32–48 in for long shelves.
How do you build shelves in a garage?
Either a freestanding unit of plywood shelves between plywood sides, or 2x4 cleats screwed to the wall studs with plywood shelves on top. Keep shelves 16–24 in deep and support them every 32–48 in.
How do you build a shelf in a corner?
Screw cleats to both walls at the same height, cut the shelf as a triangle or a quarter circle from 3/4 in plywood, and rest it on the cleats; a 1x2 front rail stiffens a wide shelf.
How far can a shelf span without support?
About 30–36 in for a 3/4 in plywood shelf loaded with books, less for MDF or particle board. Use the shelf sag calculator for your board and load.