There's no doubt that you can install new rain gutters, even if you don't need to replace the roof. Installing gutters and installing a new roof are two different tasks. If you're doing both, which we estimate happens 35 to 50% of the time, we first replace the roof and then install the gutters. If you have inadequate gutters and, for example, a large, steep roof with water that goes down very quickly during heavy rains, then you will have water running down the edge of the gutters, which can be a nuisance.
When a roof is installed, to protect the house from falling tiles and from any stairs stacked against the house, tarps are nailed to the roof cover, which is the area just above the gutters. Gutters that are manufactured for DIY purposes are usually made of cheap vinyl that simply doesn't last or small segments of metal gutters that, by nature, prevent long, pleasant stretches of seamless gutters (which is desirable because joints are common leak points). If you need to replace your rain gutters, it means you've been experiencing clogged and ineffective gutters for some time. For example, if the gutters are attached to the fascia board rather than to the roof, most roofers should be able to replace the roof without removing or damaging existing gutters.
Replacing a roof is much more expensive than replacing gutters, so it usually makes financial sense to prioritize the roof over gutters. Not only does this lengthen the installation process, but it also puts your new gutter system at risk of being damaged during uninstallation and reinstallation. Just remember that both the roof and the gutters perform essential functions in protecting your home from potential problems, so never let either of them deteriorate. However, unless you have damaged gutters or they are 30 years old, you don't have to worry about buying new gutters along with roof replacement.
Fortunately, most roofing companies employ gutter specialists or outsource the work to trusted gutter installers, so you probably don't need to look for a separate company if you determine that the time is right to replace your gutters. The new gutters do not fit the supports of the old gutters, so replacing the roof together with the gutter is the best option. Installing new gutters while replacing a roof is an economical prevention of what could be a huge and costly disaster. Gutters are a water management system designed to remove water from the roof and safely direct water away from the house using a downspout (also known as a “leader”).
White is the standard color, but it's becoming fashionable to use gutters that complement the color of the blinds. To avoid getting stuck with new gutters installed in a non-standard way, consider replacing the gutters and roof at the same time.