Foundation Repair in Flagstaff, Arizona

Cracked walls, sloping floors, sticking doors. We measure first, tell you straight whether it is structural, and put the price in writing. Free estimates across Coconino County.

(928) 877-2639

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Serving Flagstaff and all of Coconino County

Foundation repair in Flagstaff is not the same job as foundation repair in Phoenix

If you search for foundation repair in Arizona, almost everything you read will tell you the problem is expansive clay soil. Down in the Valley, that is true. Up here at 7,000 feet, it is a small part of the picture, and a company that leads with it is reading from a script written for a different city.

Flagstaff sits on the Colorado Plateau inside the San Francisco Volcanic Field. Sunset Crater erupted about a thousand years ago. The ground under your house is largely volcanic cinder over basalt, with clay in the places where basalt has weathered. On top of that, we get roughly a hundred inches of snow a year, more than a hundred freeze-and-thaw cycles a winter, and a monsoon that can drop an inch of rain in under an hour. That combination is what breaks foundations here, and it is nothing like what happens in Maricopa County.

The City of Flagstaff sets the frost line at 30 inches. Plenty of older houses in this town have footings half that deep.

The four things that actually move foundations here

1. Freeze and thaw, over and over

Flagstaff does not freeze in November and stay frozen. It drops below freezing overnight and climbs above it during the day, more than a hundred times in a normal winter. Water in soil expands about nine percent every time it freezes. Each cycle lifts a shallow footing a fraction of an inch, and it never comes back to exactly where it started. That is why the City of Flagstaff requires exterior footings 30 inches into undisturbed soil, and why frost-protected shallow foundations are not permitted for crawlspace construction here. Houses built before that was enforced are the ones we see most.

2. Cinder compresses and washes out

Volcanic cinder is porous, lightweight and full of voids. It drains beautifully and it bears load poorly. Under sustained weight it compacts. Under moving water it physically relocates, opening voids under footings. And the depth of it varies wildly across a single lot — basalt at four feet on one corner and twelve feet of cinder on the next. Uneven bearing produces uneven settlement, and uneven settlement is what cracks houses.

3. Water, twice a year

March and April, months of accumulated snow release into ground that is still partly frozen and cannot absorb it. July through September, monsoon storms dump water on ground baked hard by a dry May and June. Two saturation seasons a year, with a dry stretch between them. Nearly every call we go on has a water story behind it — a downspout at the corner, a grade that slopes back toward the wall, or a snow pile that gets shoveled against the same stem wall every winter.

4. Clay, where basalt has weathered

Basalt breaks down into clay, and clay swells wet and shrinks dry like it does anywhere. Areas on the south side of town tend to carry more clay content than the free-draining cinder ground east of the city limits. So the expansive clay story is not wrong here — it is just one of four things rather than the whole explanation.

Get someone out to look at it.

Free estimate, free second opinion, and an honest answer about whether it is structural.

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What we repair

Signs worth a phone call

Call this week

Stair-step cracks through block mortar joints
Any horizontal crack across a wall
A crack that is measurably wider than last season
A visible gap where an addition meets the house
A wall that looks like it is leaning inward
Standing water in the crawlspace

Worth having looked at

Doors in one part of the house sticking or swinging open
Floors that slope or bounce
Drywall cracks that come back after every patch
Gaps under baseboards that vary along a wall
A musty smell at floor level in spring
Exterior concrete tilting toward the house

Most of what we look at is not an emergency, and we will tell you when that is the case. About half the "settling" calls we go on turn out to be drainage, a leaking line, or a crack that has not moved in twenty years. Finding that out costs you nothing.

How we work

We measure before we say anything

Elevation readings across the whole floor plan, crack widths recorded at both ends, and a walk around the outside looking at grade, downspouts and where the snow goes. Eyes are terrible at judging whether a floor is level. Instruments are not.

Drainage comes first

If water is driving the problem, no repair holds until the water is handled. Regrading and downspout extensions are the cheapest work we do and often the most effective. We would rather sell you a hundred dollars of downspout than a repair you did not need.

Written price before anything starts

You get the scope and the number in writing, and it does not change unless you approve a change. Estimates are free and there is no travel charge anywhere in Coconino County — Sedona, Williams, Munds Park, Leupp, all of it.

Engineers for structural work

Anything structural should be designed by an engineer who does not work for the repair company. It protects you, it makes permitting straightforward, and it gives you documentation that matters when you sell.

Six inches of fall in the first ten feet. It is the cheapest foundation insurance available.

Know the rules before you hire anybody

Arizona regulates contractors through the Registrar of Contractors, and you can check any company's license status, classification and complaint history yourself, free, at roc.az.gov. It takes about ninety seconds and most homeowners never do it.

Three things worth knowing before you sign a contract for foundation work in this state:

The Recovery Fund. Arizona maintains a Residential Contractors' Recovery Fund that can pay a homeowner up to $30,000 per residence when a licensed residential contractor's defective work is not made right, with a $200,000 cap across any one license. It applies to your primary residence. Critically, it only applies if the contractor held a license. Hire unlicensed and you have no claim at all.
Two years. You generally have two years from the last date of work to file a complaint with the Registrar of Contractors. Do not sit on a problem hoping it settles down.
Permits. Structural repair requires one. Inside city limits that is the City of Flagstaff; in Doney Park, Kachina Village, Mountainaire, Munds Park, Bellemont and the rest of unincorporated Coconino County, it is the county. Anyone who suggests skipping the permit is telling you something important about how they work.

We put this on the front page because almost nobody in this trade does, and because a homeowner who knows the rules gets better work out of everybody.

Where we work

Flagstaff and its neighborhoods, plus the surrounding communities across Coconino County and down into the Verde Valley. Each of these has its own ground and its own problems, so we have written them up separately.

No travel charge to any of them. If you are somewhere in the county that is not on this list, call and ask — the answer is usually yes.

Questions we get most

Is foundation repair in Flagstaff different from the rest of Arizona?

Yes, substantially. The Valley's problem is expansive clay. Flagstaff's problems are freeze-thaw cycling at 7,000 feet, volcanic cinder that compresses and washes out, and two heavy saturation seasons a year from snowmelt and monsoon. Clay matters here too, but it is one factor of four rather than the whole story.

How much does foundation repair cost in Flagstaff?

It depends almost entirely on the cause. Sealing a stable crack is a few hundred dollars. Drainage correction is usually modest. Underpinning is priced per pier and depends on how many piers and how deep they have to go, and depth is genuinely unpredictable on our volcanic ground until the first pier is driven. We give a written price after looking, and it does not change unless you approve a change.

Do you charge for an estimate?

No, and there is no travel charge anywhere in Coconino County.

How fast can you come out?

Calls are answered 24/7. For anything that looks urgent — horizontal cracking, a visibly leaning wall, water actively getting into a crawlspace — we prioritize it.

Will my homeowners insurance pay for this?

Usually not. Standard policies typically exclude earth movement and gradual settling. There is sometimes coverage when a sudden covered event caused it, such as a burst supply line washing out soil. Read your policy and call your agent.

Should I get a structural engineer?

For anything structural, yes. An independent engineer works for you rather than for the repair company, and the report is documentation you will want when you sell. For a hairline crack in a garage slab, it is overkill.

Can foundation problems be fixed permanently?

Yes, when the cause is addressed and not just the symptom. Piers landed on basalt do not settle. But if water keeps washing cinder out from under a footing every spring, no repair holds. That is why drainage is part of nearly every job we do.

What is the best time of year for this work in Flagstaff?

Late spring through fall for anything involving excavation. Winter ground here is frozen or saturated and neither is good to work in. Interior work can often go year-round. If your problem is urgent we deal with it whenever it happens; if it can wait for better conditions, we will tell you.

Get a free estimate

No charge to come look, and no charge to tell you it's nothing. Fill this out or call (928) 877-2639.

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