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Retaining Wall Contractors in Phoenix, AZ

Retaining walls built to hold — engineered for Phoenix soils, permitted and inspected.

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CMU Retaining Wall Systems That Hold Grade for Decades

Retaining walls in Phoenix are often structural necessities, not cosmetic choices. Father & Son Masonry has been building large retaining walls across Phoenix and the Phoenix metro since 1994, with every project personally overseen by David or Karen Carrillo from the first site assessment to the final inspection.

8×8×16 standard and bond beam CMU — structural block from Old Castle, Superlite, and AZ Best Block
Steel rebar and Simpson epoxy 3G anchor installations on every retaining wall, regardless of height
Permit management included — engineer coordination, city application, and inspection sign-off handled by FSM

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Maricopa County requires a permit and stamped engineering plans for retaining walls over 4 feet — a process Father & Son Masonry handles from application to final inspection. We source CMU block from Superlite Block, large gravity block from AZ Best Block and Old Castle, and coordinate directly with City of Phoenix and Maricopa County building departments on every permitted project. When your retaining wall contractor knows the local permitting process, the project doesn’t stall waiting on paperwork.

Retaining Wall Construction Built for the Desert Southwest

A retaining wall that looks solid on the surface can still fail at the base if the footing doesn’t reach stable bearing soil — or fail from behind when hydrostatic pressure builds up against a wall with no drainage layer. Those two failure points are more common in Phoenix than most property owners realize. Expansive soils push harder after saturation. Monsoon rainfall events deliver water faster than fine-grained backfill can drain. Temperature swings from summer highs to winter nights create movement cycles that work against poorly reinforced mortar joints over time. Every retaining wall Father & Son Masonry builds is designed around both failure points: a footing engineered for the actual soil and a drainage system installed before the first course of block is set.

Footing depth and width from stamped drawings — not rule-of-thumb estimates. Every structural retaining wall over 4 feet in Phoenix requires a permit and engineer of record. We build to the plan — footing dimensions, rebar placement, and grout schedule exactly as specified.
Drainage engineered before block goes up — 3/4″ crushed rock directly behind the wall, filter fabric separation from native soil, perforated drain pipe at footing level routing water away from the wall base. This is what prevents hydrostatic pressure from building during Phoenix’s summer monsoons.
Type S mortar throughout — ASTM C270 Type S (1,800 psi minimum) for all structural masonry in contact with earth. Type N mortar is not used on any retaining wall that carries lateral soil load, regardless of wall height.
Full-cell grouting per ACI 530 — vertical rebar at 24″ o.c. minimum, horizontal bond beam reinforcement, and grout poured in lifts per the pour height requirements of the adopted code — standard for all City of Phoenix permitted structural walls.

How We Build Retaining Walls in Phoenix

Retaining wall stability depends on decisions made during site assessment, drainage design, and footing installation — all work that’s invisible once the project is complete. Skipping the drainage layer, under-sizing the footing, or compacting backfill in lifts that are too deep are the most common causes of retaining wall failure in Phoenix. Our process makes sure every below-grade component is done correctly before we build up.

Site assessment and engineering review — We evaluate slope conditions, soil type, load requirements, and coordinate stamped engineering drawings for all walls over 4 feet.
Permit application and material ordering — We submit the permit to City of Phoenix or Maricopa County and order block, rebar, drainage aggregate, and filter fabric per the approved structural plan.
Excavation, footing, and drainage prep — We excavate to required footing depth, form and pour the reinforced concrete footing, then install perforated drain pipe and free-draining gravel at the base before any block is set.
Wall construction and reinforcement — Courses are laid with Type S mortar, rebar placed per the structural plan, and cells grouted in lifts per ACI 530 requirements.
Backfill, compaction, and final inspection — Granular fill is compacted in controlled lifts behind the wall, drainage is verified functional, and we coordinate the final inspection before closing out the permit.

Get a Free Retaining Wall Estimate in Phoenix, AZ

If you’re dealing with a slope problem, drainage issue, or need a structural retaining wall anywhere in the Phoenix metro, Father & Son Masonry provides engineered construction with the local expertise to get it right the first time. Free on-site estimates, written quotes with itemized breakdowns, full Arizona contractor licensing and insurance, and complete permit coordination. Contact us today to schedule your site visit.

Frequently Asked Questions About Masonry Services

In most cases, yes. The City of Phoenix requires a building permit for retaining walls over 4 feet in height, measured from the bottom of the footing to the top of the wall. Walls adjacent to property lines, structures, or public right-of-ways may have lower thresholds. Maricopa County has similar requirements for unincorporated areas. Father & Son Masonry handles permit applications and required engineering submittals as part of every structural retaining wall project.
The right wall type depends on height, the soil behind it, and the loads it needs to resist. For residential retaining walls between 4 and 6 feet, reinforced CMU block with grouted cores is the most common and cost-effective solution in Phoenix. Poured concrete is preferred for taller walls or applications requiring higher structural capacity. Large concrete block gravity walls work well for lower walls where speed of installation matters. Any structural wall in Maricopa County must account for expansive soil conditions and include an engineered drainage layer regardless of material type.
For all structural retaining walls, we use Type S mortar (ASTM C270). Type S has a minimum compressive strength of 1,800 psi and the Portland cement content required for masonry in contact with earth or exposed to moisture cycling — the standard for City of Phoenix permitted retaining wall construction. Type N mortar (750 psi minimum) is appropriate only for non-structural landscape garden walls not subject to significant soil pressure.
We build retaining walls in reinforced CMU block (standard 8x8x16 inch), large concrete gravity block (2x2x6 foot), poured concrete with formed and reinforced footings, and natural stone (dry-stacked or mortared). CMU block is sourced from Superlite Block; large retaining block from AZ Best Block and Old Castle. For any permitted structural wall, all masonry uses Type S mortar and rebar placement per the engineer of record’s specifications, with full-cell grouting in structural cores.
Footing depth is determined by the engineer of record based on wall height, soil bearing capacity, and site conditions. Footings extend a minimum of 12 inches below finish grade and must bear on competent native soil — not loose fill or disturbed material. Arizona has no frost line, but footings must clear caliche voids and reach stable bearing. For walls over 4 feet, footing size and depth are specified on the stamped engineering plan and inspected before concrete is poured.
For a typical residential retaining wall — up to 50 linear feet, 4 to 6 feet tall, fully permitted — construction runs 5 to 10 working days from excavation to final backfill. Permit processing through City of Phoenix or Maricopa County typically adds 2 to 4 weeks prior to mobilization. Larger walls, natural stone work, or projects requiring engineer coordination extend the timeline. We include a project schedule in the written estimate.
Drainage is one of the most critical and most commonly skipped elements of retaining wall construction. For every structural wall we build, we install free-draining granular fill (clean 3/4″ crushed rock) directly behind the wall, separated from native soil by filter fabric, with a perforated drain pipe at the footing level routing water away from the wall base. This system prevents hydrostatic pressure from building during Phoenix’s monsoon rainfall events — the primary cause of retaining wall failure in the desert Southwest.

Structural Masonry & Concrete Solutions for Every Project Scale

Father & Son Masonry has been the structural masonry contractor Phoenix homeowners and commercial developers rely on since 1994. ROC licensed, BBB A+ rated, and supervised on every job — we hold the same structural standards on a single retaining wall as on a full commercial shell building.

Steel rebar on every job — standard practice, not an upsell
Owner on every job site: David or Karen Carrillo from first visit to final sign-off
ROC licensed since 1994 · BBB Accredited · A+ Rating

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We operate throughout Maricopa County and the greater Phoenix metro. Whether your project is in the East Valley, West Valley, or central Phoenix, we come to your project or property for a detailed site walk.