How to Build an Indoor Grow Box

Written by erick kristian
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How to Build an Indoor Grow Box
A grow box can be made from an old cupboard. (pink flowers growing in the wooden box. image by starush from

Building an indoor grow box can help you keep the conditions of your garden constant throughout the seasons within the security of your own home, away from pests like bugs, birds and rodents who may try to get at your crops. An indoor grow box can be very small or very large, and the size can be changed to fit the environment. The cost of creating an indoor grow box depends largely on the materials and equipment used, but you can create a quality grow box for less than £65.

Skill level:

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Things you need

  • Old cabinet or cupboard
  • Florescent lights
  • Screwdriver
  • Screws
  • Duct tape
  • Drill
  • Power bar
  • Timer
  • Mylar or aluminium foil
  • Tarp or spill guard
  • Bathroom exhaust fan

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  1. 1

    Find or construct the grow box. It is much easier to find a grow box than build one. An old cupboard or cabinet is ideal for an indoor grow box. These can be found at garage sales or in classified listings in newspapers or online. Constructing the box is not ideal because the raw materials will likely cost more than a used cupboard or cabinet.

  2. 2

    Purchase lights. Avoid excess heat caused by metal halide or HPS bulbs. Purchase florescent lights instead. Purchase enough lights to cover the entire ceiling of the grow box.

  3. 3

    Install the lights. Most florescent lights come with a fixture that has allocated spots for screws to go through. Screw the lights into the ceiling of the grow box. Tape the electric cables from the lights together.

  4. 4

    Drill a hole at the back of the box. Run the electric cables through the hole. Pull the cables through the hole. Connect the cables to a power bar. Connect the power bar to a timer.

  5. 5

    Line the inside of the grow box with Mylar or aluminium foil. These materials will help reflect light. Put a dust sheet, tarp or spill guard at the bottom of the box to keep any dirt or water from damaging the box.

  6. 6

    Purchase a bathroom exhaust fan. Drill a hole into the back of the cabinet the size of the exhaust fan. Install the exhaust fan into that hole and mount it there using screws. This will keep the air in the grow box fresh.

  7. 7

    Plug in the exhaust fan and timer. Set the timer so it goes on and off when the plants need light and dark. Different plants require different light schedules. Test the equipment. Put the potted plants in and let them grow.

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