How do I bathroom / kitchen / extension? etc.

Curious to hear people's thoughts on this.

• we want 2 radiators installed and chased in neatly into the wall with no visible pipes.
  
• originally the plumber said we'd need to chase into the concrete floor in both rooms and it would be more work than expected.
  
• Quoted £700 to do it all on the basis that he'd need to get someone to help to do it in one day, or it would take him two days. Alternatively it'd be £350 if I did the chasing.
  
  

In the end OH said fuck it let just them to do it.

The plumber was unsure about cutting into the sitting room floor as he wasn't sure where the gas supply to the fire was. Suggested chasing out behind the skirting board for the sitting room, which he has now done.

When I talked to my OH they immediately asked what the new price was on the basis that they didn't do what was agreed and this is a lesser task.

Plumber was here from 10/11am to 6pm and is back tomorrow at 11am - I guess for another 3hrs or so.

TBH I felt a bit blindsided after a full on day in a full on week. My gut is that so far he's still chased it in so when finished there will be no visible pipes in the sitting room. I'd prefer it to have been under the floor, but equally if something goes wrong it's easier to access. So I'm not sure a reduction is relevant. To be clear my OH isn't expecting the £350 price, just not £700.