How Much Does Retaining Wall Installation Cost in Novato, CA? (2026)

Average Cost

$28,681–$67,795

Materials

$21,600–$52,200

Labor (North Bay)

$1,345–$2,036

Labor rates in North Bay are +18% compared to Sacramento Metro baseline.

A landscaping retaining wall installation includes excavating a level trench, laying a compacted gravel base, stacking segmental blocks or natural stone with proper setback, backfilling with drainage gravel, installing perforated drain pipe, and capping the wall. Retaining walls manage slopes, prevent erosion, and create level planting areas or terraces. This estimate uses NorCal pricing for 2025-2026.

Novato is located in Marin County (North Bay). North Marin family-oriented city with 1960s–90s suburban neighborhoods. The local utility provider is PG&E.

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City

Linear feet of wall

Materials Included

Segmental retaining wall blocks3600 each

$10,800–$28,800

Crushed gravel base (3/4" minus)60 cu yd

$2,100–$3,300

Drain rock backfill (3/4" clean)90 cu yd

$3,150–$5,400

Perforated drain pipe (4" w/ sock)900 linear ft

$1,350–$2,700

Cap blocks / coping stones900 each

$3,600–$10,800

Block adhesive (landscape)120 tube

$600–$1,200

Labor(North Bay +18%)

Mason / hardscape installer15h @ $65–$100/hr

$974–$1,505

Laborer / excavation9h @ $41–$59/hr

$372–$531

Contractor Markup25%

0%Avg 30%100%

Materials

$21,600–$52,200

Labor

$1,345–$2,036

Markup

$5,736–$13,559

Estimated Total Cost

$28,681 – $67,795

$956–$2,260 per unit

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Project Timeline

Layout & excavation

2-4 hours

Mark the wall line with stakes and string, excavate a trench 6-8 inches deep and 24 inches wide, and compact the subgrade.

Base preparation

1-2 hours

Spread and compact a 6-inch gravel base, checking for level across the full length of the wall.

Block stacking & drainage

4-8 hours

Stack blocks with proper setback (typically 3/4" per course), backfill each course with drain rock, and lay perforated pipe behind the first course.

Capping & backfill

1-3 hours

Adhesive-set cap blocks, complete final backfill, grade soil behind the wall, and restore landscape.

Materials Breakdown

Material	Qty	Unit	Unit Cost	Total
Segmental retaining wall blocks	3600	each	$3–$8	$10,800–$28,800
Crushed gravel base (3/4" minus)	60	cu yd	$35–$55	$2,100–$3,300
Drain rock backfill (3/4" clean)	90	cu yd	$35–$60	$3,150–$5,400
Perforated drain pipe (4" w/ sock)	900	linear ft	$1.5–$3	$1,350–$2,700
Cap blocks / coping stones	900	each	$4–$12	$3,600–$10,800
Block adhesive (landscape)	120	tube	$5–$10	$600–$1,200

Retaining Wall Installation in Novato — FAQ

Do I need a permit for a retaining wall in Sacramento?+

Sacramento County generally requires a building permit for retaining walls over 4 feet tall (measured from the bottom of the footing to the top of the wall). Walls near property lines or public right-of-way may have additional setback requirements.

How high can a landscape retaining wall be?+

Segmental block walls are typically built up to 4 feet without engineering. Walls over 4 feet require a licensed engineer's design and a building permit. Terracing with multiple shorter walls is a common alternative.

How long does a retaining wall last?+

A properly built segmental block wall lasts 50+ years. The key is a compacted gravel base, proper drainage behind the wall, and correct setback on each course.