Meridian Retaining Walls works with Eagle homeowners on hillside, street-side and common-lot retaining walls. Know this going in: a common-lot wall here goes to Design Review at any height, and the city puts staff-level review at about 3 to 4 weeks, a 10-day appeal period included.
That goes for new walls, tiers up a slope, low walls along the street and HOA common-lot walls alike. Call us with the wall’s length and height, the slope it stands on and whether it faces a street. Keep your HOA’s approval handy too, because the city’s building checklist asks for it as a signed letter.
- Building permit
- Over 4 ft, footing to top
- Fence permit
- $25, front yard or street side
- Staff-level Design Review
- About 3 to 4 weeks
- Hillside tiers
- Engineered under 10 ft apart, over 4 ft combined
Retaining wall services in Eagle: hillside, front-yard and common-lot walls
Hillside and foothill retaining walls
For a sloped lot taken in steps. On these, a soils report and grading plan come with the job, and the city adds up the heights of walls set close together, as the hillside section below explains, and tiered retaining walls has the spacing.
Front-yard and street-side retaining walls
For a low wall along the street or the front walk, where the sight line comes first. No fence or wall in a front yard may block vision above 2.5 feet, measured from the street centerline grade. New walls are covered under retaining wall installation.
Common-lot and tall engineered walls
For an HOA wall, or any wall past 4 feet. The building checklist wants stamped Idaho-engineer calculations for walls more than 4 feet from footing to top. See engineered retaining walls.
Got a slope to hold back in Eagle?
Tell us the length, the height and what the wall holds back.
Retaining wall permits in Eagle, case by case
| Where the wall is | What the city requires | Source |
|---|---|---|
| Any lot, more than 4 feet from footing to top | Building permit from the Building Department, with stamped Idaho-engineer calculations and HOA approval as a signed letter. | Fence and retaining wall page; building checklist. |
| Residential front yard, or along any street | Fence permit from Planning and Zoning at any height, $25. In a front yard, nothing that blocks vision above 2.5 feet from the street centerline grade. | Fence and retaining wall page; fence permit checklist, December 2025. |
| Common lot or commercial site | Design Review at any height. A commercial wall also takes the building permit over 4 feet or with a surcharge. | Fence and retaining wall page. |
| Hillside lot, walls less than 10 feet apart | Engineered design once the combined height exceeds 4 feet, approved before any wall inspection is scheduled. | Hillside grading checklist, March 2024. |
These can stack up. A tall wall beside a street can need two of them.
And remember where the 4 feet starts: at the footing, not the lawn. Some of the wall you’re counting sits below ground. Before you settle on a design close to 4 feet, ask the Building Department how it measures. The city’s address is 660 E Civic Lane and its phone is 208-939-6813.
Check your wall against the permit ruleor send us the details
How long does Design Review take in Eagle, and what is paid up front?
About 3 to 4 weeks at staff level, by the city’s own figure, with a 10-day appeal period counted inside that.
You pay a plan review deposit before review starts: $50 for small projects, $250 for a new home. Whether a wall counts as a small project is the Building Department’s call. Start work without a permit and you’re charged a double fee.
For the building permit itself, ask the Building Department about review time and the fee for your wall. For the wall itself, the retaining wall cost page has published ranges by wall type.
Hillside retaining walls in Eagle: when two tiers count by combined height
Splitting a slope into two short walls doesn’t get you under the 4 foot line here. Eagle’s hillside checklist, updated March 2024, adds the heights together whenever the walls are less than 10 feet apart, and past 4 feet combined the pair must be engineered.
The block industry association treats two walls as independent only when they sit more than twice the lower wall’s height apart, which for two 3 foot walls works out to more than 6 feet. Say you’ve got two 3 foot walls set 8 feet apart on a foothill lot. They’re past the association’s distance, yes. But they’re still under 10 feet apart, and 3 + 3 = 6 feet combined, so in Eagle they go to an engineer.
The same checklist requires a site-specific soils report with wall-drain recommendations, and a grading plan stamped by a civil engineer with 2 foot contours, then a stamped engineer’s letter before the final building inspection.
Avimor, Alscott Rocking A Ranch and Valnova each have a separate hillside checklist on the city’s Building page. Ask the Building Department whether your lot counts as hillside.
On a slope and unsure whether one wall or two fits? Call us with the rise in feet and the run you have to work with.
River-bottom ground, Dry Creek and floodplain fill
Eagle says its flooding comes from Dry Creek and the Boise River, and that even regrading or filling in the floodplain requires a permit. A retaining wall gets backfilled, so on low ground ask the city whether that fill counts before you order rock.
Two floodplain soils in the federal soil survey are wet ones. Moulton is poorly drained, with a water table commonly 18 to 26 inches below the surface over sand and gravel. Notus is saturated within 20 inches for part of the year. Neither description says which soil is under a given lot. A hole dug to trench depth will.
What to look for in an Eagle retaining wall quote
- Every approval by name Building permit, fence permit, Design Review, floodplain permit: which ones this wall takes, and who files each.
- The HOA letter Signed. That’s the form the building checklist asks for.
- Stamped calculations past 4 feet From an Idaho engineer. Priced in, or plainly excluded.
- Soils report and grading plan The quote should say who orders them.
- Tier spacing in feet Measured between the walls, so it can be checked against the hillside rule.
- An Idaho registration number The state Contractors Board says a contractor must be registered for any job over $2,000 in labor and materials, and an unregistered one cannot pull a permit.
Eagle retaining wall questions
Do I need a permit for a short retaining wall in my Eagle front yard?
Yes. Height doesn’t matter there: a residential wall in a front yard or along any street needs the $25 fence permit from Planning and Zoning. The 4 foot building permit line is a separate rule, explained on the retaining wall permits page. The Treasure Valley areas page sets Eagle’s offices beside the rest of the valley’s.
Can a retaining wall be on the property line in Eagle?
Ask Planning and Zoning about the lot-line setback before anything gets staked. For the street edge, see the front-yard row in the permit table above.
Does my HOA approval count with the city?
It counts, but only as one item. The signed HOA letter is on the building checklist, and the permits and Design Review above still apply.
Don't see your question? Call (208) 445-1999.
Sources and review date
Reviewed October 2026. Sources: City of Eagle fence and retaining wall page, permit and hillside checklists, Design Review page, building fee schedule and floodplain sheet; federal soil survey; block industry association; Idaho Contractors Board.