Ready-to-assemble bookcases are available at home retailers but often look diminutive and flimsy.

For more impact, try assembling several side-by-side.

These inexpensive bookcases can mimic the look of custombuilt-in shelveswhen united with trim.

DIY built-in bookcase

Credit: Adam Albright

What You Need

Step 1: Screw the bookcases together.

Assemble bookcases if needed.Paint all units the same colorwe recommend a darker finish for a sleek, modern look.

Once the bookcases are set in place, screw them together, eliminating gaps between the pieces.

bookshelves clamp step 1

Credit: Adam Albright

Anchor the bookcases to the wall.

Step 2: Cut trim for bookcases.

Adding trim to the top of the unit is the most important step in creating custom, built-in appeal.

bookshelf nail wall step 3

Credit: Adam Albright

Sand the trim before painting the same color as the shelving units.

Step 3: Attach the smaller trim.

Nail the smaller trim across the front of the entire unit using trim nails.

bookshelf nail trim step 4

Credit: Adam Albright

see to it the trim pieces are level to the top of the bookcase.

Step 4: Nail the larger trim.

Repeat with the other larger board, setting it higher than the first, so it reaches the ceiling.

This will also help keep the trim level.

Step 5: Touch up and decorate built-ins.

Fill holes with wood filler, and touch up with paint.

When finished,decorate the built-in shelveswith your favorite books and accessories.

You could also experiment with paint or contact paper inside the shelves for a fun custom look.