This is the 3168th most frequent Polish word.
remontować
To renovate or to repair.
The word 'remontować' here refers to the action of renovating or repairing a specific place—'łazienkę', the bathroom.
Muszę remontować łazienkę przed zimą.
I need to renovate the bathroom before winter.
In this sentence, 'remontować' indicates the intention or planning to renovate a location—'cały budynek', the entire building.
Oni planują remontować cały budynek w przyszłym roku.
They plan to renovate the entire building next year.
Here, 'remontować' describes the action of repairing public infrastructure, specifically roads ('drogi').