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Construction Budget Planner
The number a builder quotes is rarely the number a build costs. Between the lot, site work, permits, allowances, upgrades and the contingency every honest builder recommends, the finished figure is usually meaningfully higher than the base contract.
This planner assembles the whole budget in one place, then shows the financing that has to cover it, including the interest-only payments during construction that many buyers forget to plan for.
Your numbers
Production builders in Central PA often land lower; custom work runs higher.
Five to ten percent is the range experienced builders plan around.
Your results
Total project cost
$821,940
Lot, construction, site work, upgrades, soft costs and contingency
- Hard construction cost
- $516,000
- Soft costs
- $43,260
- Contingency reserve
- $57,680
- Cash or equity required
- $123,291
- Construction loan amount
- $698,649
- Interest during construction
- $21,105
- Highest monthly interest payment
- $4,221
- Permanent payment after conversion
- $4,416
2400 sq ft at $215
About 10 months of draws
Near the end of the build, when the full balance is drawn
Principal and interest only
| Line | Amount | Share of project |
|---|---|---|
| Lot | $120,000 | 14.6% |
| Construction | $516,000 | 62.8% |
| Site work | $45,000 | 5.5% |
| Upgrades | $40,000 | 4.9% |
| Soft costs | $43,260 | 5.3% |
| Contingency | $57,680 | 7% |
What happens if you change this
Your finished project lands near $821,940, and the base construction contract is only $516,000 of it. Financing $698,649 at 7.25% through a 10-month build costs roughly $21,105 in interest, with the heaviest month around $4,221 once the full balance is drawn. After conversion the permanent payment settles near $4,416 in principal and interest. Trimming $20,000 of upgrades would lower the permanent payment by about $126 a month.
Ready for real numbers?
Estimates get you oriented. A pre-approval gets you an offer sellers take seriously.
Related calculators
- Construction Loan CalculatorModel interest-only draw payments during the build and your permanent payment after conversion.
- Builder Upgrade Budget CalculatorPrice the design-center visit before you go: what upgrades cost per month once financed, what has to be paid in cash, and how much the appraisal is likely to support.
- Mortgage Payment CalculatorSee your full monthly payment — principal, interest, taxes, insurance and mortgage insurance — not just principal and interest.
- Cash to Close CalculatorThe single number that matters most at the start: how much you actually need in the bank.
Questions people ask
- Do I make payments while my home is being built?
- On most construction loans you pay interest only on the funds drawn so far, so payments start small and grow as the house goes up. A one-time-close structure rolls into a permanent mortgage at completion without a second closing.
- How much contingency should I budget for a build?
- Plan five to ten percent of the project. Change orders, allowance overages and site surprises are normal rather than exceptional, and a reserve keeps them from becoming a financing problem mid-build.
Estimates for education only — not a loan approval, rate quote, or commitment to lend. Actual figures depend on credit, property, program guidelines, and market conditions at the time of lock. Corie Adams · NMLS #1875205 · Network Funding, LP · NMLS ID #2297 · Equal Housing Opportunity.
In plain English
It assembles every line of a build, from lot to contingency, into one honest total.
When to use it
- You are early in planning a build and need a real number
- You are comparing a builder's base price against the finished cost
- You want to know what the construction period itself will cost you
Common mistakes
- Budgeting the base contract only
- Site work, allowances, permits and upgrades routinely add ten to twenty-five percent.
- Skipping the contingency
- Five to ten percent is normal, not pessimistic. Every experienced builder plans for it.
- Forgetting interest during construction
- You pay on drawn funds while the house goes up, often while still paying rent or a current mortgage.