How to calculate the stairwell area? Analysis and practical guide of hot topics across the Internet
Recently, the issue of calculating the area of stairwells has become a hot topic in the field of decoration and real estate. Especially in the process of home purchase, decoration or house acceptance, how to accurately calculate the stairwell area is directly related to space utilization and cost accounting. This article will combine the hot discussions on the Internet in the past 10 days to provide you with a detailed analysis of the calculation method of the stairwell area and provide a structured data reference.
1. Core points for calculating stairwell area
According to the "Code for Calculation of Building Area of Construction Projects" (GB/T 50353-2013), the following key points should be paid attention to when calculating the area of stairwells:
| Computing scenarios | Calculation method | Things to note |
|---|---|---|
| Single story stairwell | Calculated based on the horizontal area of the outer wall of the stairwell | Includes wall thickness |
| multi-storey building | Calculated based on the sum of the horizontal projection areas of the natural layer | No deduction will be made for stairwells with width ≤30cm |
| Duplex / loft | Calculate area by floor | Stairs are no longer double counted |
| outdoor stairs | Calculated based on horizontal projected area × 1/2 | Requires a permanent roof |
2. Calculation differences for different building types
Judging from recent cases hotly discussed by netizens, there are obvious differences in the calculation of stairwell area for different building types:
| Building type | Area ratio reference value | Typical points of dispute |
|---|---|---|
| Ordinary residence | 8-12% | Whether it is included in the shared area |
| villa | 6-10% | Special calculations for spiral staircases |
| commercial building | 15-20% | Are fire stairs fully counted? |
| loft apartment | 5-8% | The problem of ownership of attic stairs |
3. Top 5 recent hot issues
Based on the discussion intensity in major decoration forums and real estate platforms, we have sorted out the five issues that have received the most attention recently:
1.Is the stairwell area deducted?The latest regulations make it clear that no deduction will be made when the width of the stairwell is ≤30cm, and the hollow part in the middle should be deducted when it is >30cm.
2.Duplex apartment staircase double counting problem.The housing and construction departments in many places have made it clear that the stairs connecting floors in duplex units should not be counted twice in the construction area.
3.Curved staircase calculation method.It should be calculated based on the outermost dimension of its horizontal projection, and cannot simply be calculated by taking the diameter.
4.Basement stairs belong.Netizens broke the news that some developers included basement stairs in the pool, causing controversy. According to regulations, they should be noted separately.
5.Stairs remodeled after renovation.If you change the original design parameters after renovation, you need to re-apply for area change registration.
4. Practical calculation case demonstration
Take the stairwell in a recent hot real estate rights protection case as an example:
| parameters | numerical value | Calculation basis |
|---|---|---|
| long stairwell | 4.2 meters | Including 15cm of walls on both sides |
| stairwell width | 2.6 meters | Including 10cm each of the front and rear walls |
| stairwell width | 25cm | No deduction for items less than 30cm |
| Number of layers | 18th floor | high-rise residential |
| total area | 196.56㎡ | 4.2×2.6×18 |
5. Expert advice and precautions
1.Key inspections during acceptance: It is recommended to bring a laser rangefinder for on-site measurement to check the consistency with the house purchase contract.
2.The reasonableness of the share ratio: The proportion of shared spaces in ordinary residential stairwells usually does not exceed 35% of the total shared area.
3.Decoration design influence: Modification of the stair tread height/depth may change the calculation basis and must be reported in advance.
4.Key points for rights protection and evidence collection: Keep key evidence such as original design drawings and area measurement reports.
5.Pay attention to regional differences: Some provinces and cities have local supplementary regulations. It is recommended to consult the local housing and construction department.
Through the above structured analysis and data display, I hope it can help you clearly understand the calculation method of stairwell area. Related topics have continued to heat up recently. It is recommended that home buyers and decoration owners master this knowledge in advance to avoid subsequent disputes. If you need more accurate calculations, it is recommended to entrust a professional surveying and mapping agency to conduct on-site measurements.
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