grading issues with new contraction next door

[Carmen Graves]

Dear BP,

New construction is happening right next to our property. We just learned that they plan to build their sidewalk at least 12 inches higher than ours. The new house itself is a lot higher than ours. We do have some small grading issues around our house, and have experience backyard flooding once with some water flooding into our crawlspace. What can we do to help protect our property from more flooding issues specially having such a gigantic elevated construction happening next door? Should we contact the GC? Should we report to the city/county? Should we get a lawyer? Any thoughts/advice would be highly appreciated. Thanks in advance.