What it costs to build a custom home in Temecula (2026)
Cost per square foot, site work on acreage, soft costs and a real contract-to-final example, from a builder who has done this since 2006.
Published Sep 28, 2026 · Aldana Hart Builders, Temecula, CA
The short answer.
Most custom homes we build in the Temecula Valley land between $400 and $780 per square foot for the house, plus $120,000 to $450,000 for site work on acreage. For a 3,600 sq ft home on a gently sloped lot, that is usually $1.7M to $2.5M all in.
The rest of this guide breaks that number down: what changes the price per foot, what a lot itself adds, the soft costs nobody mentions until the invoice, and one real home's contract-to-final numbers, line by line.
Cost by finish level.
The biggest lever on price per square foot is finish level, not size. These are the three tiers we build to.
Considered
$400 to $480 / sq ft
- Plans
- A stock or lightly modified plan
- Finishes
- Standard-grade throughout
- Fixtures
- Builder-selected from a set catalogue
Custom
$480 to $620 / sq ft
- Plans
- Designed for your lot by Marisol's team
- Finishes
- Upgraded windows, roofing and cabinetry
- Fixtures
- Semi-custom stone and tile selections
Estate
$620 to $780 / sq ft
- Plans
- Full custom design, no repeated elements
- Finishes
- Motorized glass, whole-home AV wiring
- Fixtures
- Imported stone, hardwood and metal work
Site work line items.
This is the part that varies most by parcel. These are planning ranges from recent site walks, not a quote for your lot; try your own parcel in the lot study for a live estimate.
- Grading & pad
- $25,000 to $150,000, flat pad to genuine hillside
- Retaining walls
- $80 to $220 per linear foot, where the grade requires them
- Geotechnical & soils report
- $6,000 to $18,000, generally required on hillside lots
- Septic system
- $38,000 to $62,000 installed, outside sewer service
- Well
- $40,000 to $90,000, only if the parcel has no water district service
- Utilities trench
- $60 to $140 per linear foot from the road to the pad
- Driveway
- $35 to $90 per linear foot, gravel to paved
- Chapter 7A fire-zone upgrades
- $15,000 to $45,000
- SCE service & transformer
- $8,000 to $35,000
- Landscape & hardscape allowance
- $40,000 to $150,000, front and defensible-space areas
Soft costs.
Design, engineering and fees, before a single yard of concrete is poured.
- Architectural design
- $45,000 to $140,000, roughly 3% to 6% of the house budget
- Structural & civil engineering
- $18,000 to $45,000
- Permits & plan check
- $15,000 to $55,000, county or city fees
- School impact fees
- Roughly $4 to $6 per sq ft, paid at permit issue
- Utility connections
- $10,000 to $60,000, beyond the trench itself
Timeline.
Plan on 16 to 22 months from the first meeting to the keys.
- Design, engineering and permits: 6 to 8 months. Longer in unincorporated De Luz or wine country than inside Temecula or Murrieta's city limits.
- Construction: 11 to 16 months. Longer on steep hillside lots or above 5,000 sq ft.
- Fixed price signed at the end of design, before grading starts, not after.
What makes budgets slip.
Almost every cost overrun we have seen on other builders' projects traces back to one of three things.
- Change orders without a price attached. A verbal "sure, we can do that" that shows up on the final invoice with no number agreed in advance.
- Allowances set too low to win the bid. A budget that looks good on paper because the fixture and finish allowances were never realistic.
- Site conditions priced after they're found, instead of surveyed and priced into the number before you sign.
Fixed price after design prevents most of this by construction: we do not sign a number until the design, selections and site survey are done, so there is very little left to discover once the number is on paper. Every remaining change is priced in writing before work continues.
A worked example: No. 03, Boulder House.
3,400 sq ft, one story, on 5.0 acres of granite outcrops in La Cresta, Murrieta. Contract price against final invoice, line by line.
- Site workgrading, septic, utilities, driveway
- $215K → $215K
- House shellfoundation, framing, roof, windows
- $610K → $610K
- Systemselectrical, plumbing, HVAC
- $285K → $285K
- Interior finishescabinetry, stone, flooring
- $390K → $402K (owners' kitchen stone upgrade, priced in writing)
- Fees, permits, design
- $120K → $120K
- Total
- $1.62M → $1.65M +1.9%
Note from the build: we kept all eleven boulders on the lot and built the house around them; that decision was in the original design, not a change order.
Want the full guide?
This page is the short version. The full guide adds worked examples for two more homes, a printable site-work checklist and a construction-loan primer.
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Questions
What is the cost per square foot for a custom home in Temecula?
Most custom homes we build in the Temecula Valley run $400 to $780 per square foot for the house itself, depending on the finish level: Considered, Custom or Estate. Site work on acreage is a separate line, on top of that per-foot number.
How much does septic cost?
A septic system installed to Riverside County's standards typically runs $38,000 to $62,000, depending on soil percolation and the system type the county requires for your parcel.
How much does grading cost on a hillside?
On a flat or gently sloped pad, grading often runs $25,000 to $60,000. On a genuine hillside lot, with more cut and fill and often a retaining wall, plan on $70,000 to $150,000 or more, confirmed by a geotechnical report before you price the house.
Does a two-story home cost less per square foot?
Usually a little. A two-story home shares one foundation and one roof across two floors, which spreads those costs over more square footage. The saving is typically modest, on the order of 5% to 10% per square foot, not dramatic.
What's not included in a builder's price?
Land, furniture, most landscaping beyond a set allowance, and anything you buy directly outside the contract. Our fixed price includes design, engineering, the site work we've surveyed, construction, permits and our fee, and every allowance and exclusion is written down before you sign.
How much contingency should I hold?
Every fixed price already carries a contingency for unknowns a survey cannot show, like buried rock. Beyond that, we suggest owners keep 5% to 10% of the house budget available for their own choices and upgrades as the design comes together.
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