Site Preparation
Preparing Your Property for a Mini-Home
What Homeowners Should Know Before Delivery
One of the advantages of a mini-home is that the construction process is dramatically simpler than building a traditional house. Because the homes are delivered as completed structures, most of the work happens before the home arrives, in the form of site preparation.
Whether your mini-home will serve as a primary residence or an Accessory Dwelling Unit (ADU), homeowners are responsible for preparing the property to receive the unit. These improvements are not included in the price of the home itself and are typically completed by local contractors prior to delivery.
The main elements of site preparation include:
- 1Electrical power (200-amp service or solar system)
- 2Water supply (well or municipal connection)
- 3Septic system installation
- 4Concrete slab foundation
Electrical Service
200-Amp Grid Connection or Solar Power
Every mini-home requires a reliable source of electrical power. Most homeowners choose a standard 200-amp residential service, which provides sufficient capacity for appliances, lighting, and heating and cooling systems.
Grid Power Installation
If the property does not already have electrical service, the local utility will need to bring power to the site. The process usually involves:
- •Installing a transformer connection
- •Running underground or overhead service lines
- •Installing a meter and main electrical panel
- •Running conduit from the meter to the house location
| Service Type | Typical Cost |
|---|---|
| 200-amp electrical service connection | $3,000 – $10,000 |
| Long rural utility extension (if required) | $10,000 – $25,000+ |
In rural areas, power extension can be the largest variable in the site-preparation budget.
Solar Power Option
For remote locations or owners seeking energy independence, a solar package may be used instead of or alongside grid power.
A typical starter system for mini-homes includes:
- •5 kW solar array
- •Hybrid inverter
- •Battery storage system
- •Backup grid connection (optional)
| System | Estimated Cost |
|---|---|
| 5 kW solar system with batteries | $15,000 – $30,000 |
Actual pricing depends on battery capacity and site conditions. Learn more about solar options →
Water Supply
Installing a Well
If municipal water is not available, the property will require a private well. Wells are drilled into underground aquifers to supply potable water to the home.
Typical Well Specifications
Residential wells typically deliver 5–15 gallons per minute (GPM). Even lower-flow wells can function effectively when paired with a pressure tank and storage system.
| GPM | Water Availability |
|---|---|
| 5 GPM | Adequate for small households |
| 8–10 GPM | Comfortable residential supply |
| 15+ GPM | High-capacity well |
Typical Well Components
- •Drilled well casing
- •Submersible pump
- •Pressure tank
- •Water line to the house
- •Electrical connection for the pump
| Well Installation | Typical Cost |
|---|---|
| Drilled well | $8,000 – $20,000 |
| Pump, pressure tank, plumbing | $2,000 – $5,000 |
Typical total
$10,000 – $25,000
Depth of the well and local geology are the largest cost factors.
Septic System
Wastewater Treatment for Rural Properties
Properties not connected to municipal sewer systems must install a septic system, which treats wastewater onsite.
A septic system typically consists of:
- •Septic tank
- •Distribution box
- •Leach field (drain field)
- •Inspection ports
The size of the system depends primarily on the number of bedrooms, not the square footage of the home.
Typical Septic Sizing
| Bedrooms | Tank Size | Typical System Capacity |
|---|---|---|
| Studio / 1 bedroom | 750 – 1,000 gallon tank | Small leach field |
| 2 bedrooms | 1,000 gallon tank | Standard field |
| 3 bedrooms | 1,250 gallon tank | Larger field |
Septic Requirements by Model
| Model | Bedrooms | Typical Septic Size |
|---|---|---|
| Brookside Cottage | Studio | 750–1,000 gal |
| Woodside Starter Home | 1 bedroom | 1,000 gal |
| Lakeside Family Home | 3 bedrooms | 1,250 gal |
| Duplex Models | 2–4 bedrooms equivalent | 1,250–1,500 gal |
| Septic System | Typical Cost |
|---|---|
| Small system (studio / 1 BR) | $8,000 – $15,000 |
| Medium system (2 BR) | $12,000 – $20,000 |
| Large system (3+ BR) | $15,000 – $25,000 |
Local soil conditions and engineering requirements can affect pricing.
Concrete Slab Foundation
Preparing the Home’s Base
Mini-homes are designed to sit on a slab-on-grade concrete foundation, which provides a durable and cost-effective base. This type of foundation is simpler than traditional basements or crawlspaces and is widely used for modern modular and manufactured homes.
The slab must match the exact footprint of the selected home.
Slab Sizes by Model
| Model | Slab Size |
|---|---|
| Brookside Cottage | 28 ft × 16 ft |
| Woodside Starter Home | 40 ft × 16 ft |
| Lakeside Family Home | 52 ft × 16 ft |
| Woodside Duplex | 80 ft × 16 ft |
| Lakeside Estate | 92 ft × 16 ft |
Typical Slab Construction
- •Excavation and grading
- •Gravel base
- •Reinforcement mesh or rebar
- •Vapor barrier
- •Concrete pour
- •Anchor points for the home
| Slab Size | Estimated Cost |
|---|---|
| Small (Brookside Cottage) | $5,000 – $8,000 |
| Medium (Woodside Starter Home) | $7,000 – $10,000 |
| Large (Lakeside Family Home) | $9,000 – $13,000 |
| Duplex / Estate models | $12,000 – $18,000 |
Estimated Total Site Preparation Costs
Actual costs vary depending on the property and local contractors, but the following ranges provide a planning guideline.
| Category | Estimated Cost Range |
|---|---|
| Electrical service | $3,000 – $10,000 |
| Well installation | $10,000 – $25,000 |
| Septic system | $8,000 – $25,000 |
| Concrete slab | $5,000 – $18,000 |
Estimated total site preparation:
$26,000 – $78,000
Properties that already have some utilities in place may fall at the lower end of this range.
Why Site Preparation Matters
Although these site improvements represent an additional investment beyond the cost of the home itself, they are long-term infrastructure improvements to the property.
Once installed, they provide:
- •Reliable utilities
- •Increased property value
- •Permanent readiness for residential use
- •Flexibility for future buildings
In many cases, these improvements can support multiple homes on a property, particularly if owners later add additional mini-homes or accessory dwellings.
A Simpler Path to Building
Compared to traditional construction, which often involves complex foundations, months of contractor coordination, and unpredictable costs, mini-homes dramatically simplify the building process.
Once the site preparation is complete, the home itself can typically be delivered and installed in a matter of days rather than months.
For homeowners seeking an efficient path to a new residence or an accessory dwelling unit, preparing the site properly is the first step toward a fast, predictable, and rewarding building experience.