I can respond to that.
The data we report in the labour force survey released every month is what we call “seasonally adjusted”. In other words, we've taken steps to remove the impact of seasonality. When we say that employment in that sector is higher than pre-COVID levels, you can take that as being in addition to any seasonal effects.
I will note that construction is interesting in the sense that, while employment has exceeded pre-COVID levels, it's also one of the sectors with quite a large increase in job vacancies. In other words, the total labour demand, both met and unmet, is substantially higher than pre-COVID levels. You can think of investments in infrastructure and other factors driving construction activity as being responsible for that increase in overall labour demand.