Public sharing area = interior construction area × public building area sharing coefficient
The public building area of the whole building is divided by the sum of the building areas of the suites of the whole building, and the sharing coefficient of the public building area of the building is obtained.
The public building area consists of the following two parts:
A elevator shaft, stairs, garbage chute, power distribution room, equipment room, public hall and walkway, underground equipment room, guard room on duty, etc.
Half of the horizontal projection area of partition wall and external wall (including gables) between B suite (unit) and public building space.
C. Allocation coefficient of public building area
Interior construction area = interior usable area+interior wall area+balcony construction area
Construction area = interior construction area+assessed construction area × existing construction area
Building area is the abbreviation of "building area of suites (units)". Construction area = interior construction area+assessed construction area × existing construction area
The usable area is the sum of all the net areas of each house except the wall thickness. It includes bedroom, living room, hall, corridor, kitchen, bathroom, storage room, wardrobe (without hanging cabinets), indoor stairs (according to the projected area) and balcony. For rooms with sloping roof structure, the part with a height lower than 2.20m is not included in the area.
The interior area is the abbreviation of "interior construction area". Interior construction area = interior usable area+interior wall area+interior balcony construction area.
1. The usable area in the suite refers to the actual usable area of the room; 2. The interior wall area refers to the maintenance or load-bearing walls around the use space in each set (unit) of new residential buildings, including public walls and non-public walls; 3. The building area of indoor balcony can be divided into closed balcony, cantilever balcony (bottom balcony), concave balcony and semi-cantilever and semi-concave balcony.
Heating area = usable area inside the suite+interior wall area inside the suite.
Generally speaking: usable area * 1.49= building area.
Building area = interior building area+interior building area+balcony building area+common public area [(interior building area+interior building area+balcony building area) The Ministry of Construction clarified the calculation method of building area, and the Ministry of Construction issued the Notice on Housing Area Calculation and Housing Ownership Registration, which clearly stipulated the calculation of housing building area. This regulation has been implemented since May, 2002 1 day. The notice stipulates that in the attached drawings of the house ownership certificate, the name of the real estate surveying and mapping unit, the internal construction area of the house (with dimensions indicated on the drawing) and the shared construction area of the house shall be indicated. Regarding the calculation of housing construction area, if there is no provision or unclear provision in the Code for Property Survey, the following provisions shall be implemented temporarily:
(a) the height of the building
The building height (height) calculated by the construction area shall be above 2.20m (including 2.20m, the same below).
(2) The external wall on the same floor has both the main wall and the glass curtain wall. The building area is calculated based on the load-bearing wall, and the wall thickness is calculated according to the load-bearing wall thickness. The walls of each floor
When the thickness is different, each layer is calculated separately. Metal curtain walls and curtain walls made of other materials shall be treated with reference to the relevant provisions of glass curtain walls.
(3) Roof with sloping structure If the roof of the house is sloping structure (sloping roof), the construction area shall be calculated for the part with a height exceeding 2.20m..
(4) If the horizontal projection of the irregular enclosed balcony, pick gallery and overhead corridor exceeds the outer edge of the floor, the construction area shall be calculated according to the horizontal projection of the floor.
(5) For expansion joints and settlement joints with deformation joints on any side of the room that meet the general conditions of the house and can be used normally, calculate the construction area.
(6) Non-vertical walls For houses with inclined, curved and other non-vertical walls, the construction area shall be calculated for the part with a height exceeding 2.20m.. If the wall of the house inclines outward beyond the outer edge of the bottom plate, the construction area shall be calculated by the projection of the bottom plate.
(seven) the space under the stairs has calculated the construction area, and the space under it is no longer used.
(8) The ground floor of the street-facing building and the cantilever porch of the public * * * passage are used as the street-facing lanes of public * * * roads, regardless of whether there are columns or maintenance structures, the construction area is not calculated.
(nine) the construction area of more than two floors should be calculated according to the relevant provisions of the "real estate survey code".
(ten) buildings similar to balconies, verandahs and eaves galleries that are not connected with the interior are not counted.
(eleven) the construction area of outdoor stairs is calculated according to the sum of the horizontal projection areas of each floor.
In addition, the part of the house that has the function of use but the height (height) is less than 2.20 meters should be clearly defined in the registration of house ownership.
Rules for calculation of building area (design standard)
The National Unified Construction Area Calculation Rules is a legal document issued by the State Economic Commission with the document 1982. The main calculation rules are as follows: the scope of calculating the construction area.
1. Single-storey buildings, regardless of height, are calculated as one floor, and their construction area is calculated as the peripheral horizontal area above the toe of the external wall of the building. If there are several floors in a single-story building, the building area should also be calculated.
2. For single-story buildings with high and low spans, if the construction area needs to be calculated separately, when the high span is a side span, the construction area shall be calculated by multiplying the horizontal length between the outer surfaces of gables at both ends above the foot by the horizontal width between the outer surfaces of the outer walls above the foot and the edge of the high-span column; When the high span is a middle span, its construction area is calculated by multiplying the horizontal length between the outer surfaces of gables at both ends above the foot by the horizontal width of the outer edge line of the central column.
3. The construction area of multi-storey buildings is calculated according to the sum of the construction areas of each floor, and the bottom floor is calculated according to the horizontal area above the external wall of the building; The second floor and above are calculated according to the horizontal area of the external wall.
4. Construction area of basement, semi-basement, underground workshop, warehouse, store and underground headquarters. The corresponding entrances and exits are calculated according to the horizontal area of the periphery of the upper external wall (excluding the light well, moisture-proof layer and its protective wall).
5. Use deep foundation as underground overhead floor. If the storey height exceeds 2.2m, the construction area shall be calculated according to half of the horizontal area outside the overhead floor.
6. Inclined buildings use hanging feet as overhead floors. If the height exceeds 2.2m, the construction area shall be calculated according to the horizontal area of the periphery of the envelope.
7. The passage through the building, the foyer and hall in the building, regardless of their height, should be calculated as one floor. Halls and corridors in hallways should be calculated according to their horizontal projection area.
8. The construction area of stacks in the library is calculated according to the shelf level.
9. The construction area of elevator shaft, elevator shaft, garbage chute and pipeline shaft shall be calculated according to the natural floor of the building.
10. The building area of the stage lighting control room is calculated by multiplying the horizontal area around the envelope by the actual number of floors. If the technical height in the building exceeds 2.2m, the construction area shall be calculated.
1 1. The construction area of the awning with columns is calculated according to the external horizontal area of columns, and the awning with independent columns is calculated according to half of the horizontal projection area of the top cover.
12. The construction area of carports and platforms with columns is calculated according to the horizontal area around the columns; The construction area of carports, carports and platforms with single-row columns and independent columns shall be calculated as half of the horizontal projection area of the top cover.
13. Stairwells, water tanks and elevator rooms with retaining structures protruding from the roof shall be calculated according to the horizontal area around the retaining structures.
14. Doors protruding from the wall are calculated according to the horizontal area of the periphery of the enclosure structure.
15. Balcony and corridor are closed, and the construction area should be calculated according to its horizontal projection area. The construction area of concave balcony and cantilever balcony is calculated according to half of its horizontal projection area.
16. The corridor and eaves gallery with a top cover and columns outside the building wall shall be calculated according to the horizontal area of the outer edge line of the columns. 17. The construction area of corridor and eaves gallery without columns shall be calculated as half of its projected area.
17. The overhead corridor with a roof between two buildings shall be calculated according to the projected area of the corridor. The construction area of overhead corridor without roof is calculated as half of its projected area.
18. The outdoor staircase is used as the main passage and evacuation, and is calculated according to the horizontal projection area of each floor. If there are stairs in the building, the outdoor stairs are calculated according to half of the horizontal projection area.
19. If the elevated single-story building spans other buildings and structures, the construction area shall be calculated according to its horizontal projection area, and if it is a multi-story building, it shall be calculated according to the multi-story.
Do not calculate the building area range.
1. Components, fittings and artistic decorations that highlight the wall surface, such as columns, cribs, footholds, steps, pillar-free awnings, etc.
2. Outdoor ladders for maintenance and fire fighting.
Technical layer within 3.2.2m high.
4. Structures, such as independent chimneys, flues, oil tanks, water towers, oil (water) storage tanks, silos, circular warehouses, underground civil air defense trunk lines and branch lines.
5. Operating platform, feeding platform inside and outside the building and platform for placing boxes and cans in the building space.
6. Roof water tank without enclosure structure. Overpass and platform, stage and backstage are hung with curtains and scenery.
7. Single-storey rooms such as operation room, control room and instrument room separated in a single-storey building.
8. The floor height is less than 2.2m, the underground overhead floor with deep foundation and the overhead floor with hanging feet of inclined buildings.
other
When calculating the construction area, in case of circumstances other than the above, it can be handled with reference to the spirit of the above rules. Code for Residential Design (GB 50096- 1999) Detailed rules for calculating the internal usable area of residential buildings.
1. The usable area of the suite includes the total usable area of bedroom, living room (hall), hall, aisle, kitchen, bathroom, washroom, storage room, dining room, lobby and closet.
2. The indoor stairs of duplex apartment are included in the use area according to the natural floor area;
3 chimneys, ventilation pipes and tube wells are not included in the use area;
4. The indoor usable area is calculated according to the surface size of the structural wall, and if there is a composite insulation layer, it is calculated according to the surface size of the composite insulation layer;
5. When using the space in the sloping roof, the space with the clear height between the lower surface of the roof and the ground below 1.20m is not counted as the usable area; Clear height 1.20m-2. 10m space, and the usable area is calculated as 1/2; All spaces with clear height exceeding 2 2. 10/0m are included in the usable area;
6. The usable area of the sloping roof shall be calculated separately, not included in the usable area of the standard floor and the construction area of the standard floor. When the total construction area needs to be calculated, the use area coefficient of the standard floor should be used for back calculation.
Height and indoor clear height in Code for Residential Design (GB 50096-1999)
1. The height of ordinary residential buildings should not be higher than 2.80 meters.
2. The indoor clear height of the bedroom and living room (hall) should not be less than 2.40m, the local clear height should not be less than 2. 10 m, and its area should not be greater than 1/3 of the indoor usable area.
3. When the space in the sloping roof is used as a bedroom and a living room (hall), the indoor clear height of half the area should not be less than 2. 10m.
4. The indoor clear height of kitchen and bathroom should not be less than 2.20m..
5. The clear distance between the lower surface of the horizontal drainage pipe in the toilet and the floor and ground should not be less than 1.90m, and it will not affect the opening of doors and sashes.
For the problem of cracks, you should first find out how it is caused, whether it is decoration or original existence, and then see who to look for, or look at the purchase contract to see if there are any terms in this regard. If you really don't move, depending on which city you are in, the government should have specific regulations. Of course, legal means to safeguard rights is the most effective, if the relevant parties do not act.
You can also go to the forum I love my family to discuss the decoration and ask the administrator. They are good people. I ask questions and help me solve them quickly. You can search on Baidu, hoping to help you.