About the floor area ratio and building density of residential areas

According to. National Standards of the People's Republic of China.

General Principles of Civil Building Design.

code for design of civil buildingsgb 50352—2005

2 0 10 building density; building coverage ratio

Within a certain range, the ratio of the sum of the base area of the building to the occupied area ( )2 0 11 plot ratio, floor area ratio

Within a certain range, the ratio of the sum of the floor area to the land area.

2 0 12 Green space rate Greening rate In a certain area, the proportion of the total area of various types of green space to the total area of the area ( ) The landlord is right, the people in the standard and planning departments eat too much lard, and you can fool them like this:

Build an "underground" room on the ground, build an attic.

I don't know where your calculation came According to what you said, for example, if the base area of a residential area is 5000m2, then the coverage rate (the building density you said) is: 1250m2The floor area ratio is 5000m2

The so-called building density refers to the total floor area occupied by the building.

The coverage ratio (what you mean by building density) is the ratio of the total floor area to the area of the site.

But. Have you ever seen a residence with an area of more than 1,000 square meters?

The average residential building has an area of about 250,400 buildings.

So. In general, 3 or 4 houses with about 6 floors can be built.

Building density is the ratio of the floor area of the building base to the land area, and the floor area ratio is the ratio of the total floor area to the land area.

The difference between building density and floor area ratio:

The concept is different: the building density mainly reflects the vacant land rate and building density within the land area, and refers to the proportion of the total area of the building base and the planned construction land area within the project land area.

The floor area ratio is the gross density of the building area, which mainly measures the use intensity of construction land. The floor area ratio value is the dimensionless ratio, and the total floor area of the plot building is a multiple of the plot area, which is called the plot ratio value.

The calculation method is different: the building density is equal to the sum of the base area of the building divided by the area of the land used for the planned construction of the bridge. The plot ratio is equal to the total floor area above ground divided by the area of construction land.

Calculation of floor area ratio:

If the ground floor of the building is used as a passage, public parking, layout of greening sketches, residents' leisure, supporting facilities and other public purposes, the height of the overhead layer should be between meters and meters, and its construction area is not included in the floor area ratio.

At the top of the building, there are stairwells, water tank rooms, elevator machine rooms, structural (equipment pipeline) conversion floors, garages on the ground floor, utility rooms, etc. When the floor height is more than meters, the full area will be included in the floor area ratio, and if the floor height is less than meters, the area will be included in the floor area ratio according to 1 2.

The impact of floor area ratio on life:

Population density: A residential project with a high plot ratio means that more houses are built in the community, and a high plot ratio will inevitably bring a high density of residents, which will eventually lead to a decrease in the living comfort of the owners in the community.

In addition, the high-density residential population will also put greater pressure on the fitness venues, children's activity areas, entertainment and Mengle dress-up centers, as well as elevators and fire escapes in the buildings. Frequent use will exacerbate the aging of these facilities, so higher requirements should be put forward when purchasing high-density communities.

Internal planning: Due to the excessive pursuit of land use rate in high-plot ratio residences, the floors in the community will be relatively high, and the proportion of green space will be reduced accordingly, which will affect the living environment and quality of the residential area.

In addition, the spacing between buildings is too close, the roads in the community are narrow, and the parking space is insufficient, which are also common problems encountered in high plot ratio communities. How to solve these problems reasonably is not only an important task on the developer's desk, but also an important aspect to enable buyers to improve their recognition of the community.

<>1. The concept of building floor area ratio, building density, and greening rate.

1. Building floor area ratio: refers to the ratio of the total construction area within the planned construction land of the project to the planned construction land area. Outbuildings are also counted, with the exception of outbuildings that should be noted not to be counted.

2. Building density: that is, the building coverage rate, which refers to the ratio of the sum of all base areas within the project land area to the planned construction land.

3. Greening rate: refers to the ratio of the area of green space within the scope of planned construction land to the area of planned construction land.

The above-mentioned planned construction land area refers to the land area within the red line of the project land, which generally includes the area of roads, green space, buildings (structures), sports fields, etc. in the construction area.

Second, the relationship between building density and floor area ratio.

The larger the construction area, the larger the product amount and the greater the profit. In the case of a certain plot area, the plot ratio is a direct indicator to control the construction area, and the two are proportional. The increase of the building area needs to increase the number of building floors, in this case, only the sacrifice of building density to achieve the purpose of increasing the building height, at this time what needs to be coordinated is the increase of the building area, whether the reduction of the building density is in line with the goal of profit maximization.

The reduction of building density brings about the inadequacy of land use, that is, the waste of land cost, and the increase in construction area brings about the increase of the first paragraph, and the contradiction between the two needs to find a reasonable point and a balanced point to maximize the construction area on the basis of not wasting the land as much as possible.

3. Indicators of building floor area ratio, building density and greening rate.

1. Nature of land use: second-class residential land;

Main planning indicators: floor area ratio: ;

Building density: 30%; 35% of green space areas;

2. Nature of land use: residential (compatible with commercial finance and administrative office);

Main planning indicators: floor area ratio: ;

Building density: 40%; green space rate 25%;

3. Nature of land use: residential (compatible with commercial finance and administrative office);

Main planning indicators: floor area ratio: ;

Building density: 28%; 35% of green space areas;

4. Nature of land use: residential (compatible with commercial finance and administrative office);

Main planning indicators: floor area ratio: ;

Building density: 28%; 35% of green space areas;

5. Nature of land use: commercial, office (compatible with hotel industry) land;

Main planning indicators: floor area ratio: ;

Building density: 28%; 35% of green space areas;

6. Nature of land use: land for public facilities;

Main planning indicators: floor area ratio: 8;

Building density: 55%;

7. Nature of land use: commercial finance, residential (compatible with administrative office) land;

Main planning indicators: floor area ratio: ; Building density: 26%;

35% of green space areas;

8. Nature of land use: commercial and office (compatible with hotel industry) land;

Main planning indicators: floor area ratio: ; Building density: 28%;

35% of green space areas;

9. Nature of land use: residential land;

Main planning indicators: floor area ratio: ;

Building density: 22%; Green space rate 40%;

Building density refers to the coverage rate of buildings, which refers to the ratio of the total building area to the building land area within the project land area, which can reflect the vacant land rate and building density within a certain land rangeCalculation formula: building density = total building area Total land area.

Plot ratio: the ratio of the total construction area to the building land area within the project land area. Calculation formula: plot ratio = total floor area total land area.

Among them, the area of building land: refers to the area of land actually occupied by buildings or building complexes, including the area of outdoor works (such as greening, roads, parking lots, etc.), the shape and size of which are controlled by the building red line. That is, the effective land area.

Building area: refers to the vertical projection area of the building, but does not include the awning, overhead balcony, overhead passage connecting the two buildings with the cornice, the patio under the glass vault, the outdoor staircase and the street bridge connecting the building in the neighborhood, etc.

Total floor area: refers to the sum of the floor area of each floor above ground and below the ground level of a single or multiple buildings within the construction site.

1. Floor area ratio: Floor area ratio, also known as gross density of construction area, refers to the ratio of the total construction area to the land area of a community, which is an important indicator to measure the intensity of construction land use.

2. Building density: Building density specifically refers to the ratio (%) of the total area of the building within the scope of the project land to the area of planned construction land, which can reflect the vacant land rate and building density within a certain land range.

1. The concept of building density and floor area ratio:

1) Floor area ratio, also known as gross density of construction area, is the ratio of the total above-ground construction area (but must be the construction area above plus or minus 0 elevation) to the total land area of the project within the scope of the project. The floor area ratio is an important indicator to measure the intensity of construction land use.

The value of the plot ratio is a dimensionless ratio, usually the plot area is 1, and the total floor area of the buildings on the plot is a multiple of the plot area, that is, the value of the plot ratio. It refers to the ratio of the total floor area of a community to the land area.

2) Refers to the ratio (%) of the sum of the base area of the building to the occupied land area within a certain range, which refers to the coverage rate of the building, specifically refers to the ratio (%) of the total base area of all buildings within the scope of the project land to the area of planned construction land (%), which can reflect the vacant land rate and building density within a certain land range.

2. The difference between the floor area ratio and the building density is that the calculation method is different

1) Building density calculation formula: building density The sum of the base area of the building and the area of planned construction land.

For example, if a piece of land is 10,000 square meters, of which the ground floor area of the building is 3,000 square meters, the building density of this land is 3,000 10,000 = 30%. The building density generally does not exceed 40%-50%, and part of the land needs to be set aside for roads, greening, squares, parking lots, etc.

2) Plot ratio calculation formula: plot ratio, total above-ground construction area, buildable land area.

If the ground floor of the building is used as a passage, public parking, layout of greening sketches, residents' recreation, supporting facilities and other public purposes, the height of the overhead layer should be between meters and meters, and its construction area is not included in the floor area ratio.