This Design Trick Will Brighten a Dark Room without Major Renovation
You won't even need an extra window.

Brightening a dark room usually always requires adding new pieces (mirrors, lamps) or major makeovers (installing a new window, breaking down a wall). Luckily, there is a third option that doesn't involves neither of those. All you need to do is don those overalls, run to the hardware store for buckets of white paint, and give your walls and ceilings a fresh coat of non-color. Doing this will instantly boost a dark room's reflective qualities, provide the illusion of more space, and overall just make it look brighter than it ever was.
To see how you can make it work for your home, scroll through the images below:
Living Room
White ceilings, furniture, and artwork will visually expand the walls of any living room. If you have dark flooring, provide a lively vibe with some greenery. Furniture with wide spaces underneath will also allow light to pass through and illuminate your room.
Bedroom
If your bedroom has a small window or have none at all, white walls can compensate for the lack of natural light. Add pops of color with artwork, metal accents, and printed sheets or pillows.
Kitchen
Aside from painting the walls bright white, sticking to a minimalist color palette can amplify the effect. To add more texture, you can opt for paints with a shiny finish or go for a marble or printed backsplash.
Home Office
Many home offices are smaller than the rest of the house, so painting its walls all-white will help give the illusion of more space that's conducive for long hours.