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This question depends on how the construction contract and the oral agreement are negotiated. If the contract and verbal agreement do not specify, the carpenter and the electrician themselves can only negotiate who will open the light hole. According to my many years of construction experience, the lamp holes are mostly constructed by carpenters.
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The ceiling is a carpentry business, and the natural opening of the light hole is also done by the carpenter. The electrician only installs the lights.
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How do you run the line if you don't groove, do you want to ask the plasterer who built the wall to cut it out for you? How do you install lights without opening holes? Take the price of installing the lamp and ask the carpenter to open the light hole for you?
Of course, our carpentry is open, 20 one of your water and electricity money? It is called benevolence and righteousness to open it for you, and it is natural to open it if you don't open it!
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Drilling is an electrician's job. Of course, it was the electrician who opened it. If the carpenter is opened, there is a fee. If you have a lot of money, you can ask a carpenter to drive.
Generally speaking, it is opened by an electrician, and the hole is opened according to the size of the downlight purchased when installing the downlight.
It depends on who Party A hands over the opening task, as the following plumbers and carpenters must cooperate with each other, so that the project can be successfully completed and accepted.
Don't worry about this, the general installer knows how to install, you just need to tell the installer what you think.
It looks like it may be equipped with a bath bomb or a ventilation fan, depending on where it is.
The pattern is the so-called gypsum line, which can be purchased directly from the market, and can be customized according to the design documents, unless it is a large quantity, or it is not cost-effective, because it is necessary to develop the mold according to your design documents.