Sources checked
Price a usable site instead of a bare parcel
Land development cost depends on ground conditions, access, terrain, distance to services, intended use and the approvals required. Two equally sized lots can need very different work. A per-acre figure hides those differences. Begin with a site plan and a list of the work needed to install and operate your specific home.
Keep investigation and design costs visible. Surveying, soil or wastewater assessment and service enquiries can reveal a project-stopping constraint before construction spending begins. These items are part of the usable-site cost, even when they do not produce a visible feature.
Use a line-by-line quote schedule
| Cost group | Scope to ask for | Common exclusion |
|---|---|---|
| Investigations | Survey, ground, wastewater and relevant hazard checks | Specialist follow-up if results are unsuitable |
| Approvals and design | Application drawings and required engineering | Revisions or additional submissions |
| Access and earthwork | Clearing, driveway, grading and erosion control | Rock, unsuitable material or long haul distances |
| Services | Water, power, wastewater and communications | Utility-provider charges and metering |
| Home installation | Foundation/support, delivery and positioning | Restricted-access equipment and commissioning |
| Finishing and upkeep | Drainage, surfaces, fencing and maintenance | Future resurfacing or equipment replacement |
Ask for quantity, unit rate, tax, validity date and what changes the price. Compare the same scope across bidders; a low total with major exclusions is not an equivalent quote.
Show a budget scenario transparently
An illustrative site budget includes 2,000 for investigations, 3,000 for design and applications, 8,000 for access, 6,000 for ground work, 18,000 for services and 5,000 for support and placement: 42,000 before tax, contingency and unresolved work. All figures are planning examples in one currency, not current market prices.
Add a separate allowance for identified uncertainties and record what evidence will resolve them. Do not conceal an unknown wastewater system inside a small generic contingency; it needs investigation and a viable approved design.
Review changes and recurring costs
Track additions and reductions by work package. A layout move can alter trench lengths, driveway work, support design and delivery access at once. Ask the team to state those effects before approving the change.
After installation, budget for inspection, pumping, filters, ground or driveway maintenance, taxes or rent, service standing charges and equipment replacement. Use the project budget planner with your own quotes and keep the original scope beside it. Review the budget again when investigations or design decisions materially change the project.
Sources & further reading
Official guidance and original source material used for the factual points in this guide. Planning examples and worksheets are our own illustrations.
- USDA NRCS: Web Soil Survey
- FEMA: Access to official flood maps
- EPA: Types of septic systems
- Oregon State University Extension: Creating a Land Steward property management plan
- PHMSA: Contact 811 before digging
Checked 8 October 2026. Location-specific rules, availability and product specifications can change. Suggest a correction.