A small home still needs a buildable place to sit, a route for construction, and working connections to the systems that serve it. Two similar floor plans can create very different construction scopes when their properties have different access, ground conditions, drainage or utility needs.
The useful early question is: what must happen on this property before—and alongside—the building itself? Making those requirements visible helps you compare options while the design can still change.
Start with construction access
A backyard may have room for an ADU without offering an easy route for excavation equipment, concrete delivery, materials or debris removal. Gates, overhead lines, trees, existing structures and narrow driveways can affect how the work is performed.
Ask where equipment will enter, where materials can be staged, and which existing surfaces or landscape features will need protection or restoration. Access is part of the construction scope, not just a delivery detail.
Understand what is below the surface
The visible yard does not explain everything about the ground. Soil conditions, rock, fill, buried obstructions and existing foundations can affect excavation and foundation planning. Available surveys, reports and records provide a starting point; additional investigation may be needed for the proposed work.
A planning budget should distinguish confirmed information from assumptions. If ground conditions remain uncertain, identify what review would help resolve them rather than treating an unverified foundation approach as final.
Plan grading and drainage together
Building placement changes how the site works. Differences in elevation, existing drainage patterns and the relationship to nearby structures can influence grading, retaining work and how water is managed around the new building.
Review those relationships before fixing the floor elevation, entry location or outdoor living plan. The right solution depends on the property and should be coordinated with the appropriate project specialists.
Trace the utility connections
A short line on a concept plan can represent a substantial amount of work. Water, wastewater, power and other services need realistic connection routes, with existing capacity and connection requirements reviewed for the intended use.
Ask what is known about the existing systems, where the proposed connections would run, and whether the work may include upgrades, trenching or restoration. Do not assume a nearby service is automatically ready to support another dwelling.
Include the work around the home
Paths, steps, patios, drainage work and repairs to disturbed surfaces can be easy to overlook when attention is on the floor plan. Define which exterior work belongs in the construction scope and which work the owner or another contractor will complete separately.
The Rancho Mirage Casita case study illustrates why that distinction matters: TKG completed its contracted casita construction, while the owner’s grounds are being finished separately. The landscaped hero is a labeled visualization; the completion photographs document the built work.
Make the assumptions visible in the budget
A useful site-work budget identifies what is included, what remains to be investigated, and which decisions could change the scope. Compare alternatives using the same boundaries so one option is not carrying work that another quietly excludes.
- What site information is available, and what still needs review?
- How will equipment, materials and workers reach the building area?
- What excavation, grading and drainage work is included?
- What is assumed about utility capacity and connection routes?
- Which surfaces and landscape areas will be restored?
- Which exterior work belongs to another contractor or a later phase?
For the building-related decisions that also shape the investment, read How Much Does an ADU Cost? Our process connects feasibility, design and budget so the team can investigate the property before too many decisions become fixed.
Bring the property into the conversation.
Share the location, intended use and any photos, surveys or reports you already have through Start Your Project. Finished plans are not required. We can begin by identifying the site questions that need attention and the next useful step.