u/FranklyIGiveADaaaamn

I have a closed commercial property I’ve been doing repairs on under a permit throughout last year with some breaks in between. I’ve just hired a contractor to finish the remaining structural work. Permit was issued in April of last year and I’m just wondering: if I’ve been doing work under it on and off, can I continue using it to finish up the work, or do I need to rush to the township to “renew” it?