Why the registered property area includes the area of common area? 為何房屋權狀面積，有包含公共設施？
Q1: What is the common area ratio?
A: According to the Ministry of the Interior’s National Land Administration, the formula for calculating the common area ratio is:
(Shared area listed in the ownership certificate ÷ Total building area) × 100% = Common area ratio.
The shared area refers to the common facilities used collectively by all residents in the community or building. These are also the common portions shown in the property ownership certificate.
Example:
If you buy an apartment in Taiwan with a total title area of 1,000 square meters, and 250 square meters are common areas:
250 ÷ 1,000 × 100% = 25%. The building’s common area ratio is 25%.
Q2: Are Taiwan’s property ownership certificates the only ones that include common areas?
A: Compared with countries in Asia, the Americas, and Europe , Australia, only Taiwan and mainland China include the area of common facilities in the total property area recorded on the ownership certificate. In other countries, the registered property area refers only to the usable indoor space.
Q3: Does the parking space area count as a common area?
A: Some parking spaces in Taiwan are registered as independent property titles, but in most cases, parking spaces are part of the shared community area. If the parking spaces included in the shared area are privately owned, their area should be deducted when calculating the common area ratio.
Formula for calculating the common area ratio:
(Shared area – parking space area) ÷ [Main building + accessory building + (shared area – parking space area)] = Common area ratio.
Q4: What is included in the common area?
A:
1) Essential common areas: Entrance hall, corridors, stairways, passageways, driveways, mechanical/electrical rooms, power reception rooms, basements, emergency staircases, smoke exhaust rooms, electrical rooms, fire safety facilities, water reservoirs, water tanks, and legally required air-raid shelters.
2) Non-essential common areas: Gym, reading room, indoor swimming pool, KTV, sauna, recreation facilities, and lounge.
Q5: What are 'large common areas' and 'small common areas'?
A: These are informal public terms, not official legal terminology.
Large common areas: Spaces jointly owned and used by all property owners in the community. Essential ones include the lobby, management office, power room, stairways, refuge rooms, basements, etc. Non-essential ones include gyms, reading rooms, recreational facilities, and lounges.
Small common areas: Facilities shared by residents on the same floor, such as elevator halls, corridors, and passageways. All of these are essential common areas.
Q6: Do all buildings have the same common area ratio?
A: No, it varies by building type.
1. Apartment: 4–5 stories, no elevator → about 5–15%.
2. Mid-rise Building : 7–10 stories, with elevator → about 15–20%.
3. High-rise Community: 10+ stories, with elevator and full facilities → about 30% or more.
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Q1：什麼是公設比？
A：依據內政部國土管理署解釋，公設比的計算方式為：
「建物權狀中，共同使用部分的持分坪數 ÷ 建物總坪數＝公設比」。
共同使用部分就是【公共設施】，是社區或大樓全體住戶共同使用的設施，也是房子所有權狀裡標示的【共有部分】面積。
舉例來說，在台灣買了一間房屋，權狀是1,000平方公尺，但共有部分是250平方公尺：
250 ÷ 1,000 × 100% = 25%，這間房屋的公設比就是25%。
Q2：只有台灣的房屋所有權狀面積包含公設嗎？
A：相比亞洲、美洲及澳洲等國家，只有台灣與中國大陸的房屋權狀登記包含室內面積以外的公設部分。其他國家的房屋權狀登記面積，都是室內可使用面積。
Q3：車位面積也算在公設嗎？
A：台灣有些大樓的車位是獨立產權，但多數仍屬社區共有部分。若共有部分的車位為私人所有，計算時需扣除該車位面積。
一般公設比計算公式：
共有部分（扣除車位面積）÷【主建物＋附屬建物＋共有部分（扣除車位面積）】＝公設比。
Q4：公設包含哪些？
A：
1）必要性公設：門廳、走廊、樓梯間、通道、車道、機電室、受電室、地下室、安全梯、排煙室、配電室、消防設施、蓄水池、水箱、防空避難室。
2）非必要性公設：健身房、閱覽室、室內游泳池、KTV、三溫暖、休閒娛樂設施、交誼廳。
Q5：什麼是大公（設）與小公（設）？
A：這是民間慣用語，並非正式法律名詞。
大公（設）：由全社區的所有權人持分，並可共同使用的空間。必要性公設包含大廳、管理室、受電室、樓梯間、避難室、地下室等；非必要性公設包含健身房、閱覽室、休閒設施、交誼廳等。
小公（設）：由同一樓層住戶共同使用的設施，如電梯間、走道、通道等，皆屬必要性公設。
Q6：每間房屋的公設比都一樣嗎？
A：不一樣。
1 公寓：4~5層、無電梯，約5%~15%。
2 華廈：7~10層、有電梯，約15%~20%。
3 社區大樓：10層以上、有電梯，約30%以上。
依著作權法第十及八十八條，本網站內容未經上品房屋同意請不得轉載