Villa have been in a relegation battle for much of the season, but head into their final game at Wigan with their Premier League place secure for next season.
Lambert is planning to sit down with each of his players next week to discuss the future before they depart for their summer break.
And the Scot is looking to further improve the club both on and off the pitch during the close season.
"You have to keep building," said Lambert. "Next year will be really tough again. Finances dictate a lot of stuff.
"If you go and buy experienced players and names, they command a lot of money. I have to keep building this squad. It will have to be rebuilt. It's still in a transitional period.
"To develop it the way you want - not just the team but the club - you have to implement your own ideas and what you want to do. That's not just on the pitch but off it too."
Asked whether more experienced talent is needed in his squad after his young side struggled valiantly against relegation this term, Lambert said: "Not necessarily. What you're saying there in going for experienced players, as I said earlier, you go for that and the wages are massive.
"That's not what this club has to do. Not now. Not while I'm here. We have to work with what we have got. I know the remit. It's in transition.
"But our philosophy of bringing young lads in, put it this way, when you bring Matthew Lowton for £1m, Ashley Westwood for less than that, Yacouba Sylla the same, Christian Benteke - look at their values now. Every one of them.
"Brad Guzan was second choice. Andi Weimann - how many games did he play last year? Now he's played a full season. Gabby Agbonlahor has stepped up. Fabian Delph has been here God knows how long and played 30-odd games in the league. Nathan Baker too.
"You could throw every one of them in with their contribution. But their value? I am pretty sure it was healthier than when they came in."