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How to choose a bedroom size

Last updated: 24 Oct 2025
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When planning to buy a house, buy a condo, or build a new house, don't overlook bedroom size. This article will delve into everything related to legally required bedroom sizes, including a list of bedroom sizes that suit different lifestyles.

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What should the legally required bedroom size be?

When building a house or adding on to a new space, it's inevitable to discuss legal house additions. This information can be used as part of your house design and planning. Many people may wonder whether you can create a bedroom with the space you desire.

Actually, there's a set formula for the answer. According to Ministerial Regulation No. 55 (B.E. 2543) issued under the Building Control Act B.E. 2522, Chapter 2, Part 2, Sections 20 and 22, regarding bedrooms in buildings, it states:


The narrowest part of the bedroom should be at least 2.5 meters wide.

The height should be at least 2.6 meters.

The interior space should be at least 8 square meters.

There should be windows or ventilation vents covering at least 10% of the total room area.

Those planning to build a house should consider the above details as their standard bedroom size, so that you know that a smaller bedroom is illegal.

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1. Standard Bedroom Sizes for Singles

Generally, singles looking for a private bedroom may plan for a small single bedroom, which accommodates a single person or a small child.

Bedroom Layout Ideas: For a twin or XL bed, allow at least 77 centimeters of space on each side for a bed. If space permits, consider 92 centimeters on each side for a single bed.

Additionally, for a small single bedroom or a smaller bedroom, choose bright colors, lighting, or arranging the room to allow natural light, or using built-in furniture to enhance the space and make the room appear more spacious. Consider placing a large mirror in an area that reflects outside light, decorating the room in a white color scheme, and using a foldable bed instead.

Additionally, if you're a busy single or wanting to organize your house or condo for exclusive work from house, with sufficient private space, A flexible individual bedroom plan is also possible. This allows for easy adjustment of the interior space.

Bedroom Decorating Ideas: Twin or XL Twin Beds. Considerations for this bedroom layout include easy movement of items, so you need to prioritize furniture placement, views, and other elements within the room. The bed should be positioned so that it's not clearly visible from the outside.

Importantly, decorating a small bedroom is similar to a small single bedroom: emphasize a white or light color scheme, place mirrors at angles that reflect natural light, and opt for a foldable bed to maximize space.

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2. Standard Bedroom Sizes for Couples

If you're planning to move in with a significant other and spend more time together, a full/double bedroom plan is ideal for couples. Naturally, this type of bedroom emphasizes a full-size or twin bed, so you'll need to leave ample space around the bed on three sides: the left, right, and foot of the bed.

Bedroom Decorating Ideas: For a king-size bed, the door or hallway should be open and uncluttered, allowing easy access. When you enter the bedroom, the first thing you see is the view out the window. There should be no objects that attract or obstruct the view. Also, the bed should be positioned in a corner where outsiders cannot see inside to maximize privacy.

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3. Standard Bedroom Sizes for Small Children

Family-friendly families or young children prioritize privacy and privacy. The space or size of the bedroom for small children should facilitate childcare, while allowing parents time to relax or engage in other activities after completing their childcare routine.

Twin bedrooms are ideal for this group, offering a variety of bed styles and sizes to suit their needs. It also allows for easy space allocation and movement, making it ideal for separating sleeping areas when caring for a baby, and providing a private space for other tasks.

Bedroom Decorating Ideas: "Space" is crucial when planning this bedroom. Start with a single, twin, or XL-sized bed, leaving approximately 92 centimeters of space around each bed. Allow for movement and arrangement of other furniture and appliances as needed.

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Source of this article from DD Property: https://bit.ly/3F9r1uP


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