The Ultimate Guide to Soundproof Room Size Choice | Standards for Every Tatami Size

“I’m hesitant about choosing a soundproof room size” “I don’t want to regret it being too narrow after buying it”

For those with such concerns. Choosing a soundproof room size is not just a matter of ‘spaciousness’, but is determined by the balance of three factors: purpose, budget, and installation space.

In this article, we provide a ‘map of size choice’ covering the characteristics of each major size and criteria for success.

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Which is the Correct Answer? Three Success Criteria for Size Choice

First, let’s diagnose which ‘spaciousness’ you should aim for with three points.

1. Choose by Instrument/Purpose

• 0.8 to 1 Tatami: Video streaming, telework, vocals, violin.
• 1.5 Tatami: Upright piano, saxophone, flute, cello.
• 2 Tatami or more: Grand piano, multiple people, DTM, relaxed practice.

2. Choose by the Size of the Room to Install

Soundproof rooms have ‘external dimensions’. Even if the interior is 1.5 tatami, including the thickness of the walls, it occupies about 3 tatami mats worth of the room.

• 6-tatami room: 1.5 tatami is the limit (living space will be almost gone).
• 8-tatami room or more: 2 tatami or more can also be considered.

3. Choose by Budget

• Up to $3,000: Simple soundproof room (around 0.8 tatami).
• Around $10,000: Standard for unit soundproof rooms (1.5 tatami class).
• $15,000 and more: Large/high-performance models (2 tatami and more).

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Thorough Comparison Table of Major Sizes

First, let’s check the overall picture.

Size	Interior Dimensions	Actual Required Space	Price Range	Recommendation
0.8 Tatami	Approx. 80×80cm	Approx. 1.2 Tatami	$600–$3,000	★★★☆☆
1 Tatami	Approx. 90×180cm	Approx. 1.8–2 Tatami	$8,000–$12,000	★★★☆☆
1.5 Tatami	Approx. 120×180cm	Approx. 2.5–3 Tatami	$9,800–$13,000	★★★★★
2 Tatami	Approx. 180×180cm	Approx. 3.5–4 Tatami	$13,000–$18,000	★★★★☆
3 Tatami+	Custom	5 Tatami or more	$25,000–	★★☆☆☆

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Detailed Guide for Each Size

Let’s look closer at the size that fits your purpose.

1. [Extremely Small] 0.8 to 1 Tatami: For Streaming/Single Person Use

A size for those who want to “keep it cheap” and “space-saving”.

2. [Standard] 1.5 Tatami: The Most Popular Golden Size

The minimum size that an upright piano fits into, and chosen by the most instrumentalists. If you’re lost, this size is the basic.

3. [Spacious] 2 Tatami or More: Focus on Grand Piano/Comfort

A size for professional/semi-pro levels who want to “enjoy the original resonance of the instrument” or “want a space where they won’t get tired even after a long time”.

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Final Checklist Before Purchase

Lastly, we have summarized the items you must check before signing a contract.

1. Check Installation Space (External Dimensions): Is it the ‘external dimensions’ from the catalog that fit in the room, not the interior dimensions?
2. Measure Carry-in Route: Have you measured the width of the entrance, hallway, elevator, and doors?
3. Floor Load Capacity: Is it okay to place a nearly 1-ton soundproof room on the 2nd floor of a wooden building? (Must check with the management company or construction company)
4. Air Conditioning (AC): Is your heatstroke countermeasure for summer solid?
5. Comparison with Used/Rental: Is buying a new one really the best choice?

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Summary: Find Your ‘Correct Answer’

A soundproof room is a once-in-a-lifetime big purchase. Once installed, the size cannot be changed (other than replacement).

1. For mainly streaming or telework → 0.8 to 1 Tatami
2. For upright piano or wind/string instruments → 1.5 Tatami
3. For grand pianos or seeking the best resonance → 2 Tatami or more

We strongly recommend visiting a showroom first and actually going inside.

→ View Soundproof Room Price Guide in detail → Check Merits and Demerits of Soundproof Rooms