The Welsh Government is currently consulting on the plans.
But Morgan fears the extra cost of sprinklers will make new developments uneconomic in poorer parts of Wales after estimating the cost of installing sprinklers in a three bed home at £3,500.
Morgan told BBC Wales: “In areas where house prices are not that high, and I’m talking about areas where we build now, such as in the south Wales valleys, we can’t even look at the valleys any more.”
“What will happen is that the poorer areas of Wales will see no new development, the very places that need it the most will see no new development.”
Ann Jones, AM for the Vale of Clwyd, has spent four years working to get the power to legislate on this devolved.
She said the cost is more likely to be between £1,000 and £3,000, and that builders will be able to absorb costs and make other adjustments to off-set the sprinkler installation costs.
She said: “I’m proud Wales has led the way in making people safe. Surely, that’s what devolution is all about.”
Morgan warned the sprinklers combined with any carbon reduction targets could push Wales into a housing “crisis”.
He said: “The only areas that will be able to afford this extra burden will be the more expensive areas like the M4 corridor.
“My message to the Welsh Government is simple, do not put Wales at a total disadvantage to England.”
The Welsh Government said it is waiting for a cost benefit report by the Building Research Establishment to be published.