How to calculate the area of a house
When buying, selling, renovating, or renting a home, accurately measuring the square footage of your home is crucial. Whether it is calculating the amount of renovation materials or estimating the value of a property, mastering the correct measurement methods can avoid unnecessary disputes. This article will explain in detail how to measure the area of different rooms and provide structured data to help you understand quickly.
1. Basic steps for measuring house area
1.Preparation tools: Tape measure, laser rangefinder, pen and paper, calculator.
2.Measure length and width: Measure along the bottom of the wall to avoid obstruction by furniture.
3.Record data: Mark the dimensions of each room and distinguish between net area and built-up area.
4.Calculate area: Length × width = area (square meters), irregular areas can be divided and calculated.
2. Area calculation methods for common house types
| House type | Measurement points | Calculation formula |
|---|---|---|
| rectangular room | Measure the complete length of both walls | length×width |
| L shaped room | Divide into two rectangles and calculate separately | (Length 1×Width 1)+(Length 2×Width 2) |
| triangular area | Measure base and height | Bottom×height÷2 |
| circular space | Measure diameter or radius | π×radius² |
3. The difference between building area and usable area
| area type | Inclusion | Proportion reference |
|---|---|---|
| Building area | Wall + stall + apartment area | 100% |
| Inner area | Indoor net area + wall | About 80-90% |
| Used area | Actual available space | About 70-80% |
4. Measurement precautions
1.Wall thickness: Brick-concrete structure wall is about 24cm, frame structure is about 12-15cm.
2.special area: The area of the balcony is calculated as 50%, and the height of the bay window is less than 2.2m.
3.Measurement accuracy: It is recommended to keep two decimal places, and the national standard allows an error of ±3%.
4.Professional measurement: The real estate certificate area needs to be reported by the surveying and mapping department.
5. Popular decoration area calculation cases
| Decoration project | Area calculation method | Materials estimate |
|---|---|---|
| floor laying | Actual measurement area + 5% loss | 1㎡≈1.05㎡Material |
| wall painting | (Perimeter×Height)-Door and window area | 1L paint≈5-8㎡ |
| Ceiling installation | Projection area + edge closing | 1㎡≈1.2㎡Material |
6. Latest industry data reference (2023)
| city | average sharing rate | Measurement charges |
|---|---|---|
| Beijing | 25-30% | 2-5 yuan/㎡ |
| Shanghai | 22-28% | 1.8-4 yuan/㎡ |
| Guangzhou | 20-25% | 1.5-3 yuan/㎡ |
Through the above systematic measurement methods and data reference, you can easily master the house area calculation skills. It is recommended to entrust a professional organization to review before important transactions to ensure that the data is accurate. Pay attention to safety when performing actual measurements, especially protective measures when working at heights.
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