Questions to Ask a Gutter Installer
For homeowners collecting gutter bids who do not want to compare three prices for three different jobs. These 20 questions pin down size, gauge, hangers, pitch, drainage and warranty before you sign.
The questions
Open any question for the note
How long have you been installing gutters in this area, and is gutter work your main business or a sideline?
Why ask it
Roofers and handymen often add gutters as an afterthought and hand the work to whoever is free. A crew that runs a brake truck every day knows how your local roof styles and rainfall behave.
Can you send me your license number and a certificate of insurance before we schedule anything?
Why ask it
The willingness to produce paperwork unprompted separates real companies from a truck and a ladder. You want general liability plus workers' compensation, since gutter work happens 20 feet up over your driveway.
Will you measure the roof in person, or are you quoting from satellite imagery?
Why ask it
Aerial measuring software misses fascia condition, valley locations, second story runs and where the water actually goes. A quote produced without anyone standing at the corner of your house will grow once the crew arrives.
Are you forming seamless gutter on site with a brake, or installing sectional lengths from a supply house?
Why ask it
On site roll forming means one continuous piece per run and far fewer joints to leak. Sectional gutter in 10 foot pieces is cheaper up front but every seam is a future drip.
Is this quote for 5 inch or 6 inch gutter, and which profile: K-style or half-round?
Why ask it
This is the single biggest line item difference between bids, and installers often leave it off the paperwork. If one company quoted 5 inch and another 6 inch, you are not comparing prices at all.
What metal and gauge is the coil you use, and what does that mean if a ladder gets leaned on it?
Why ask it
Aluminum comes in .027 and thicker .032, and the difference shows up in dents, oil canning and ice load. Steel and copper are stiffer and pricier, and each needs a different joining method.
How many downspouts are you planning, what size are they, and exactly where will each one land?
Why ask it
Downspout count and placement decide whether the gutter drains or overflows, and 3x4 outlets carry roughly twice what 2x3 outlets do. Walk the perimeter with them so nothing ends up in front of a window or in the middle of a walkway.
How did you size the gutter and downspouts for the roof area and pitch on this house?
Why ask it
A good installer will talk about square footage of roof draining into each run and how steep planes dump water faster. Someone who just says the standard size is fine has not looked at your big rear plane.
What hanger system will you use, and at what spacing?
Why ask it
Hidden hangers screwed into the fascia every 24 inches, tightened to 16 inches in snow country, is the standard that keeps gutter from sagging. If they mention spikes and ferrules on a new install, they are working off 1970s methods.
How much pitch will you set, and how will you keep it from looking crooked along the long front run?
Why ask it
Gutter needs a slight fall toward the outlet, roughly a quarter inch per 10 feet, or water sits and breeds mosquitoes. Experienced crews explain how they split a long run or hide the drop against the shingle line.
Will the corners be hand-mitered on site or preformed strip miters, and what goes in the joints?
Why ask it
Corners and end caps are where nearly every gutter leak starts. Hand-mitered corners sealed with a proper gutter sealant hold up far longer than a snapped-in box smeared with silicone.
What is your plan for tear-off and cleanup, including the old aluminum and the nails?
Why ask it
Removing old gutter drops rotten leaf sludge, spikes and screws into your beds and lawn. Ask specifically whether they haul the old metal away and run a magnet over the ground before they leave.
What happens if you pull the old gutter off and find rotten fascia or soffit behind it?
Why ask it
This is the most common change order in gutter work, and you want the answer before the crew is on the roof. Get a written per foot rate for fascia replacement so a surprise does not become a negotiation.
Is there drip edge and kickout flashing where the roof meets a wall, and will you address it?
Why ask it
Missing drip edge lets water curl behind the gutter and rot the fascia, and a missing kickout at a roof to wall junction sends water straight into the wall cavity. An installer who spots these is looking at the whole water path, not just the metal.
Where does the water go after it leaves the downspout, and are extensions or buried drains in this price?
Why ask it
New gutters that dump at the foundation just relocate the problem to your basement. Find out whether splash blocks, hinged extensions or a tie-in to underground pipe is included or excluded.
If gutter guards are in the quote, which style are they, and does anything slide under the shingles?
Why ask it
Guards range from cheap foam inserts to micro mesh systems, and some attach by lifting the first shingle course, which can affect your roof warranty. Ask what happens to the guard warranty if the mesh clogs with pollen or pine needles.
Split the warranty for me: what covers the paint finish, what covers your labor, and what voids either?
Why ask it
Material finish warranties are from the coil manufacturer and usually address fading, chalking and peeling, while workmanship is on the installer. Ask directly whether cleaning with a pressure washer, adding guards later, or leaning a ladder on the gutter voids anything.
What is specifically included and excluded in the written price, and what is the payment schedule?
Why ask it
You want linear feet, sizes, downspout count, colors, permits, disposal and any fascia work on paper before you sign. A modest deposit with the balance on completion is normal, and a demand for most of the money up front is not.
Can I talk to two customers from at least three years ago, and have you been back to those houses since?
Why ask it
Last month's customers cannot tell you whether the seams held through two winters. Older references reveal how the work aged and whether the company answers the phone after the check clears.
What part of this job are you least confident about, and what would you do differently if it were your own house?
Why ask it
This question separates a salesperson from a tradesperson, because a real installer always has a tricky valley, a short fascia or a drainage spot in mind. The honest answer tells you where problems will show up first and often surfaces an upgrade worth paying for.
Getting Comparable Gutter Bids
Practical guidance for the conversation itself
How to Run the Estimate Process
Write the Spec, Then Get Three Prices on It
Decide the spec first, for example 6 inch K-style, .032 aluminum, hidden hangers at 24 inches, 3x4 downspouts, hand-mitered corners. Ask all three companies to bid that exact spec. Otherwise the cheapest bid wins by quietly quoting smaller, thinner gutter.
Photograph the Problem During a Hard Rain
Before anyone quotes, go outside in a downpour and take photos and video of where the gutter overflows, where water sheets off a valley, and where the ground stays soggy. Show those clips to each installer. The one who explains the cause rather than just quoting footage is the one to hire.
Verify Insurance With the Agent, Not the Contractor
Ask for the insurance agency's name and phone number and call to confirm the policy is active and includes workers' compensation. Certificates are easy to edit and expired coverage looks identical to current coverage on a PDF.
Ask Who Is Actually Coming
Find out whether the person quoting is a commissioned salesperson or the installer, and whether the crew is in-house or subcontracted. Then ask which crew lead will be on your roof and whether they have run your gutter size before.
Numbers to Have in Your Head
Gutter Specifications Cheat Sheet
- 5 inch K-style with 2x3 downspouts is the builder default and it backs up on large or steep roof planes
- 6 inch K-style with 3x4 downspouts moves roughly twice the water and clogs far less
- Half-round suits historic homes and copper work, costs more, and needs round downspouts
- .027 aluminum is the common grade, .032 is noticeably stiffer against ladder dents and ice
- Hidden hangers screwed into fascia every 24 inches, tighten to 16 inches where snow loads are heavy
- Pitch of about a quarter inch per 10 feet of run toward the outlet
- Roughly one downspout for every 30 to 40 feet of gutter, more on steep roofs
- Copper and steel seams should be soldered or riveted and sealed, never just caulked
- Baked-on finishes marketed as Kynar or PVDF hold color longer than standard painted coil
Red Flags in a Gutter Quote
- A price produced entirely from satellite measurements with no one visiting the house
- A per foot number with no gutter size, metal gauge or hanger spacing written anywhere
- Spikes and ferrules proposed on a new installation instead of hidden hangers
- Gutter guards pitched as the fix for gutter that is undersized or sloped wrong
- No line in the scope about rotten fascia, and no per foot rate if they find it
- Downspouts that discharge at the foundation with no extension included
- A large deposit or cash-only terms before any material is ordered
- A discount that expires when the salesperson leaves your driveway
- Vague warranty language such as lifetime with no document naming what is covered