It can be very expensive in most areas to have your downspouts buried. Installation can get complicated and messy with lots of careful excavation and avoiding important obstacles like your internet connection or gas pipes. The farther these lines go and the more things they have to pass under, the more expensive it gets. For what it's worth, we don't promote this service and only offer it on a case-by-case basis. We have been told our pricing is quite reasonable, so we're mostly referring to external providers. Nevertheless, we constantly hear reports of $6,000 to $10,000+ to replace downspouts around a typical Fishers home – and it can be hard to find good companies that want the challenge in the first place.
When you're looking at a price anywhere near this, it is always sensible to try and have the extensions cleaned or serviced first. If you're lucky enough to be in our service area of Northern Indianapolis we start under $300 for setup and the first 3 drains. Beyond that we do not charge if we're unable to break through within a few minutes time; a low risk and low cost way to either restore or at least diagnose your issues. Here at Done Gutter, we will also sometimes recommend spot fixes instead of an entire replacement. We only offer this to customers that we have performed jetting services for and know of the issues, but we save some of our customers a fortune by fixing small issues like an isolated damaged or low section or a bad cap setup without replacing the entire run. This is also something that can be DIY'd if you already know of the actual problem and location.
One big consideration, though, is that repairing a given pipe will not change where it routes water to. If your issue is about where that water is heading, such as pooling up at a certain point in your yard, making an area soft, etc., then repairing the existing setup may not be the answer. Replacement might be the better option here. It's possible you can salvage some length of the pipe and re-route from an existing point.
We at Done Gutter have salvaged pipes and returned them to service even after extreme root infestations because a lot of times those roots are entering through one end of the pipe or the other and not necessarily damaging the pipe itself. After careful work we've pulled out systems as long as 20ft, and pulled out several dozen pounds of gravel and mud from individual lines which then went on to work just fine, often without even any minor repairs needed.
Sometimes, though, the pipe is crushed by multiple roots, perhaps because it's near a tree or just has damage in so many spots that replacement does make the most sense. When this is the case, just be wary of a price that seems too good to be true. Getting these drains installed properly level in an area that is generally pretty flat such as Indiana, doing so as neatly as possible, and avoiding all of the potential issues hiding in your yard in the process can be quite delicate. This is probably one of those things where you tend to get what you pay for.