Introduction
Hypothetical case study — illustrative example, not a real project. The numbers below describe a fictional 1970s ranch to show how a whole-home budget assembles line by line. Every figure is a typical US planning-range value, every line item sums exactly, and the metric cross-checks close within rounding. Use it as a template for your own estimate, not as a quote.
Build the same structure for your home with the Home Remodeling Cost Calculator — enter your area, scope tier, and contingency, then replace each line below with your own figures. The method behind this budget is taught in the complete guide.
The Project: A Fictional 1970s Ranch
Our hypothetical homeowner is renovating a 1,600 sq ft (148.6 m²) single-story ranch built in 1974: original kitchen and baths, galvanized plumbing, a 100-amp panel, worn carpet over hardwood. Scope: mid-range renovation — new kitchen and bath surfaces, refinished floors, fresh paint throughout, plus the systems upgrades a 1970s home demands. No structural changes, no addition.
The Line-Item Budget
| Line item | Cost | Notes |
|---|---|---|
| Kitchen (semi-custom cabinets, quartz counters) | $38,000 | Within the $25K–$60K typical range |
| Primary bath (new tile, fixtures, waterproofing) | $22,000 | Within the $15K–$30K typical range |
| Hall bath (surfaces + fixtures) | $12,500 | Within the $8K–$15K typical range |
| Flooring: refinish 1,200 sq ft (111.5 m²) hardwood @ $12/sq ft | $14,400 | $12 × 10.764 = $129.17/m²; 111.5 × $129.17 = $14,402 ≈ $14,400 |
| Interior paint, whole house | $6,800 | Walls, ceilings, trim |
| Electrical: panel upgrade + device updates | $9,500 | 1970s home, expected cost |
| Plumbing: partial repipe, fixture rough-ins | $7,200 | Galvanized replacement where exposed |
| HVAC: service + duct corrections | $8,500 | No full replacement in this scenario |
| Demolition, haul-away, permits, misc. | $3,600 | The unseen-work line |
| Subtotal | $122,500 | Sum of all lines above — verify it |
| Contingency (15%) | $18,375 | $122,500 × 0.15 = $18,375 |
| Total planning budget | $140,875 | $122,500 + $18,375 |
Check the addition: 38,000 + 22,000 + 12,500 + 14,400 + 6,800 + 9,500 + 7,200 + 8,500 + 3,600 = $122,500 exactly; plus $18,375 contingency = $140,875 exactly. The room-level planning ranges used here come from the cost guide.
Cross-Check Against the Scope Method
Does $140,875 make sense for 1,600 sq ft at mid-range depth? $140,875 ÷ 1,600 = $88.05/sq ft loaded with contingency. In metric: $88.05 × 10.764 = $947.74/m²; 148.64 × $947.74 = $140,872 ≈ $140,875 (rounding). The unloaded rate is $122,500 ÷ 1,600 = $76.56/sq ft — at the lower end of the $100–$250 mid-range tier, which is consistent: this scenario kept structural work out and refinished rather than replaced the floors. The two-method reconciliation technique is the subject of the estimating guide.
Where the Budget Was Sensitive
Three judgment calls moved this budget most:
- Refinish vs. replace flooring saved roughly $10,000–$15,000 versus new hardwood throughout — the single biggest finish decision. Finish economics are detailed in the material guide.
- Systems priced as expected costs, not contingency. The panel and repipe were dated during the walkthrough and budgeted directly; the 15% contingency stayed reserved for genuine unknowns. The arithmetic of contingency is derived in the formula-explained guide.
- No structural changes. Keeping the layout intact avoided engineering, beam work, and the permit complexity that comes with it — the 70% over-improvement guardrail was never approached.
What Would Break This Budget
Honesty requires the failure modes: asbestos found in the flooring adhesive (+$3,000–$8,000 abatement), a rotted subfloor under the baths (+$2,000–$5,000), or a mid-project decision to move the kitchen wall (+$8,000–$15,000 with engineering). Any one of these fits inside the $18,375 contingency; two of them together would require scope trade-offs. That’s exactly what contingency is for — and the checklist helps surface these risks before demolition.
The scenario also assumes stable material prices between estimate and purchase — a reasonable planning assumption for a project starting within a few months, but worth revisiting if the timeline stretches. Lumber, copper, and fixture pricing move with commodity markets, and a six-month delay can shift the material lines several percent. The discipline is the same as everything else in this budget: name the assumption, date it, and re-check it if the calendar moves.
Related Guides
- Complete Guide — the full scope-based estimating method from first principles.
- Pro Tips — trade-tested ways to sharpen the estimate and control costs.
- Common Mistakes — the seven budget killers and how to avoid them.
- FAQ — quick answers to the most asked budgeting questions.
- DIY vs Pro — what doing it yourself actually saves, and what it costs.
- Code Compliance — permits, inspections, and the upgrade costs older homes trigger.
Frequently Asked Questions
Is this case study a real project?
No — it is explicitly a hypothetical, illustrative example. The figures are typical US planning-range values assembled to demonstrate the budgeting method, not a quote or a record of actual work.
What did the hypothetical 1,600 sq ft renovation cost?
$140,875 total: $122,500 in line items plus a 15% ($18,375) contingency. That’s $88.05/sq ft ($947.77/m²) loaded — consistent with a restrained mid-range renovation with no structural changes.
Why was the contingency only 15% for a 1970s home?
Because the likely systems upgrades (panel, repipe) were identified in the walkthrough and budgeted as direct line items. Contingency covers unknowns; known risks get their own lines. An undocumented 1970s home would warrant 20%+.
What was the biggest single cost driver?
The kitchen at $38,000 — typical, since kitchens concentrate cabinets, counters, appliances, plumbing, and electrical in one room.
How do I adapt this template to my home?
Replace each line with your area, scope, and local figures; keep the structure (anchor rooms, systems, unseen work, single contingency). The checklist enumerates every input to gather first.
What would break this budget?
Abatement surprises, hidden structural damage, or mid-project layout changes. One fits in the contingency; two together force scope trade-offs.
Get Your Number
This hypothetical shows the shape of a sound budget: anchor rooms priced individually, systems as expected costs, unseen work as its own line, one contingency applied once, and a cross-check against the scope tier. Build yours the same way with the Home Remodeling Cost Calculator — then verify every line against local contractor quotes before you commit.
Disclaimer: Calculator results are planning estimates based on the inputs you enter. Actual remodeling costs vary with region, labor markets, home age and condition, material choices, and contractor availability. Verify budgets with licensed local contractors and consult your local building authority for permit, inspection, and code requirements.
