The Hidden 15%: Soft Costs and Why Contingency Saves Marriages

Clients fixate on the per-square-foot construction number. Then they get to month sixteen and discover they're $400,000 over budget on things that were never in the construction bid in the first place. Those are soft costs, and they're roughly fifteen to twenty-five percent of any honest project.

We tell every new client: budget the construction number first, then add 25%. That second number is the one you actually need in the bank. Here's where the missing dollars go.

Soft costs in plain English

Soft costs are everything you pay for that isn't lumber, labor, or fixtures. They're the consulting fees, the carrying costs, the regulatory fees, and the furniture you forgot to budget for.

• Architecture & design fees: 7–12% of construction cost, paid over the design phase (8–12 months)
• Structural, civil, MEP engineering: 1–2% of construction
• Interior design fees: 5–15% depending on scope (hourly, flat, or % of FF&E)
• Survey, soil/geotech, environmental studies: $5K–$25K
• Permits and impact fees: 0.5–3% depending on jurisdiction
• HOA / ARC application fees: $500–$5K typically
• Utility connection fees: $5K–$50K (water, sewer, gas, electric tap fees)
• Construction loan interest reserve: 2–5% of construction cost
• Builder's risk insurance: ~0.5% of construction
• FF&E (furniture, fixtures, equipment): $50K–$500K+ — the line clients forget most
• Landscape installation: $25K–$500K depending on lot size and program

On a $3M construction project, plan for $600K-$750K of soft costs and FF&E. That's not a worst case. That's an honest case.

Contingency — what it's actually for

Contingency is not a tip. It's not optional. It's the cash reserve you tap when the soil turns out worse than the geotech suggested, when the windows arrive damaged, when you decide on month nine that the powder room really should be a half-bath.

Our minimums:

• New construction: 10–15% of construction cost
• Whole-home renovation: 20%+ (always)
• Historic restoration: 25%+ (every wall hides surprises)

If you can't fund the contingency without borrowing more, your project is too big for your budget. Better to scale back now than to be in month sixteen begging the bank for an increase.

The conversation we have with every new client

On the first call, we ask: "What's the all-in number you can fund without losing sleep?" Whatever they answer, we divide by 1.25 and call that the construction budget. Everything else — soft costs, contingency, FF&E, landscape — gets pulled from the 25%.

It's a humbling math problem. The client who said $3M finds out they're really designing to $2.4M. The $5M client is designing to $4M. Honest math saves real heartache.

The line items clients underbudget most

1. FF&E. You'll spend more furnishing a custom home than a Tesla. Plan it.
2. Landscape. A $3M house on a bare lot looks unfinished. Build a real landscape budget.
3. Window treatments. Custom shades and drapery on 40 windows runs $30K–$80K easily.
4. Smart-home equipment beyond pre-wire. The Lutron processor, speakers, displays, security cameras — tens of thousands.
5. Property tax and insurance escrow during construction. You're paying both, every month, on the construction loan.

None of these are surprises if you know to plan for them. All of them become surprises if you don't.

— Margaret Larsen, COO. Eighteen years guiding clients from first conversation through groundbreaking — budgets, contracts, permits, financing. Get the free Ultimate Home Building Checklist for the field-tested list we walk every Angel home through.