1. Measure the width of the front window and the distance from the inside (outside) angle of the top surface of the balcony railing to the brick surface outside the front of the hole.
2. Measure the width of the side window and the distance from the inner (outer) angle of the top surface of the balcony railing to the front brick surface at the edge of the hole.
3. Measure the height of the front window, the distance between the front part of the balcony railing and the wall and the distance between the upper beam and the corner, and take points in the middle according to the width of the front part to measure the height of the corresponding parts respectively, and take the small value in the measurement result as the size of the hole of the front window height.
4. Measure the height of the side window and the distance from the top edge of the balcony railing to the joint between the wall and the upper beam slab. Compare the measured results with the height of the front window measured above. If the difference is greater than 20mm, the side window should be regarded as irregular, that is, the height of both sides is not equal, but it is an ordinary window with the same height on both sides.
5. Measure the width of the railing and the distance between the inner and outer walls on the top of the balcony railing.