Active job

Update house lot of plugs/switches.

I have an entire house of plugs / light switches (approx 50 units) that need changing to new PDL 600 series or similar. Currently they are the 80s rounded type which are getting worn and outdated - as per pic. Will need COC for the work so no handymen please. I'd be really happy to do a few at a time just whenever suits someone and maybe it could just fit between other jobs/quiet days etc. Wiring all in good condition. Will need to supply the plugs/switches. Would be great to change single outlets to doubles etc, no moving of any needed.