Check your gutter estimate before you sign

Start with measured gutter runs, not the home’s interior square footage. Two houses with the same floor area can have different eave lengths, roof levels and corners. Ask for a sketch showing each run, its length, and which roof areas feed it. Separate gutter footage from vertical downspout footage.

Material, metal thickness, gutter profile and width all affect the proposed system. An aluminum K-style installation is not the same scope as copper half-round gutters with different brackets and joining methods. Record the actual specifications rather than accepting premium or heavy-duty as a material description.

Access matters too: upper-story runs, steep ground, conservatories, decks and narrow side yards can complicate installation. Removal, concealed wood damage, new flashing and underground drainage are separate scope decisions. Ask the contractor to distinguish confirmed work from allowances and optional upgrades.

The Building America Solution Center calls for adequately sized gutters and downspouts. Ask what roof area and local rainfall informed the proposed size, outlet placement and downspout count. A wider trough alone does not explain whether the whole system can move water away from the house.

Mark roof valleys, inside corners and lower roofs receiving runoff from upper roofs on the sketch. Ask how the installer will handle those concentrated flows. Require a plan for gutter slope, outlet locations and attachment to sound backing, rather than simply replacing every component in its current position.

Follow every downspout to its endpoint. Federal building-science guidance describes directing runoff away from foundations and keeping roof-water drainage separate from foundation drains. These are design references, not a substitute for local approval. Identify extensions, splash blocks or underground connections, and ask whether existing buried piping will be checked or merely reconnected.

For replacement, ask whether the installer will inspect fascia after removing the old gutters. The estimate should explain how concealed damage will be photographed, measured and authorized before repair. Identify who handles drip-edge or gutter-apron adjustments so roof runoff enters the gutter instead of passing behind it.

For guard-only work, request an inspection of existing gutter slope, attachment, leaks and outlets before covers go on. Covering a sagging or leaking system does not define a drainage repair. State whether cleaning, resealing, rehanging or downspout clearing is included or priced separately.

Name the guard manufacturer and exact model, not just a category such as micro-mesh. Ask how it attaches at the gutter lip and roof edge, how corners are treated, and how sections can be removed for service. Gutterglove’s maintenance guidance says guards still need upkeep; request instructions suited to your roof access and nearby debris.

Place the estimates side by side using the same run sketch. Reconcile measured lengths, gutter dimensions, metal thickness, downspout sizes and discharge endpoints before comparing totals. One contractor may include a new outlet and extension where another plans to reuse a short downspout.

Separate base gutters, fascia work, guards and below-ground drainage. Keep optional work visible so a guard package does not obscure the replacement scope. If quantities differ, ask each bidder to explain the measurement rather than silently substituting one figure for another.

Clarify exclusions and allowances in writing. For example, an allowance for fascia replacement needs a defined quantity, material, finish and process for approving more work. Ask for a revised estimate when specifications change, so your final comparison reflects what each contractor actually proposes to install.

Licensing, permit and deposit rules vary by state/city. Ask your local building department whether this gutter scope needs a permit, especially when it includes structural repairs or changes to drainage connections. Verify any required contractor license with the issuing agency and request proof of insurance. The FTC recommends checking licensing and insurance before hiring.

Put permit responsibility, payment milestones, start timing and cleanup in the agreement. The FTC warns against demands for full payment in advance. Ask how payments relate to delivered materials and completed gutter runs, and check local deposit restrictions rather than accepting a salesperson’s claim about a nationwide rule. California CSLB guidance illustrates why written scope and signed change orders matter.

Separate the gutter material warranty, guard product warranty and installer workmanship coverage. Obtain the actual documents and identify exclusions, claim contacts, maintenance duties and any registration steps. Manufacturer warranty statements are product-specific; they do not establish coverage for every guard. At closeout, request photographs, agreed drainage checks and a record of any unresolved punch-list work.