Barbara Corcoran‘s got some advice for Kylie Jenner on her endless home renovation journey … speed it up!!!

We got the “Shark Tank” star in NYC Tuesday … and our photog asked her about Kylie’s never-ending construction project.

Barabara is not impressed … she says her own home is “much nicer” than the makeup mogul’s … and she thinks it’s not worth it for Kylie to spend so long designing the posh pad.

The way Barbara sees it … the more time you spend fussing over the design, the less you actually live in the house when it’s finally done.

As you know, Kylie recently did a walkthrough of the construction site that is her soon-to-be home … and it doesn’t look like it will be move-in-ready anytime soon.