On 2005-03-02, manhattan42 wrote:

And since the existing riser height already exceeds maximum heights
according the IRC 2003, any alteration may necessitate the complete
reconstruction of the stairway to meet prevailing code depending on the
interpretation of the original poster's code enforcement office.

OK, obviously it depends upon the interpretation of the local
authority. But I would say that the if the modification does not
change the typical rise and run, and the "all risers within 3/8 inch"
rule is met, that it would be unreasonable for the local authority to
require the stairs to be rebuilt. That's my opinion.

If we're talking code details, another issue is the 80" of vertical
headroom requirement, from the diagonal connecting the noses of the
treads. If the noses are moved up or out, then one should verify
there is still 80" of vertical headroom.

To the OP, I agree with manhattan42 that it is important to obey the
"all risers within 3/8 inch" rule. It would be a good idea to measure
each riser now and seem if they are equal. Do you have a strategy to
deal with the topmost and bottommost riser? For example, perhaps you
are installing laminate on those floors as well. If not, then between
this issue and the laminate trim issue, I would suggest that replacing
the treads with hardwood would be a better solution.

Best wishes,
Wayne