The simple answer
Before starting a custom home design, gather the basic property information, decide what the home needs to accomplish, and identify any site or jurisdiction constraints that could affect the plan. The earlier those items are discussed, the smoother the design process usually goes.
Questions to answer early
Do you already own the lot or are you still looking?
Is the project a vacant-lot build, demo/rebuild, or major addition?
What city, county, HOA, or subdivision requirements may apply?
Do you have a survey, old plans, assessor information, or utility information?
What size range, room count, garage needs, and special features matter most?
Are there site constraints like drainage, floodplain, septic, easements, slope, or access issues?
A practical custom home planning path
Every custom home is different, but most successful projects move through a similar sequence: understand the lot, organize the goals, develop the design, and then prepare drawings that can support review and construction.
Understand the lot first
The property affects setbacks, access, drainage, utilities, zoning, and what can reasonably fit. A great custom home starts with the lot, not just the floor plan.
Organize the wish list
Separate must-haves from nice-to-haves so the design can focus on the features that matter most before the project grows too far in every direction.
Develop the design direction
Early design should balance layout, style, garage needs, outdoor living, views, privacy, circulation, and how the home will actually be used day to day.
Prepare permit drawings
Once the design direction is set, the plan set can be developed for jurisdiction review, engineering coordination, and construction communication.
What is usually included in a custom home plan set?
Exact requirements vary by jurisdiction and project scope, but custom home plans generally need to communicate the site, layout, exterior design, roof form, construction approach, and code-related information clearly enough for review and coordination.
- Site plan and property information
- Floor plans and room layout
- Exterior elevations and design intent
- Roof plan, sections, details, and construction notes
- Code notes and jurisdiction-specific information
- Structural engineering, truss coordination, and specialty input where required
Budget and scope should be discussed early
Square footage is only one factor. Roof complexity, garage size, detached structures, site conditions, engineering, HOA review, utility work, and jurisdiction requirements can all affect project complexity and planning decisions.
Think about garages and detached structures early
RV garages, shops, casitas, pool houses, and guest structures can affect site planning, setbacks, utilities, driveway layout, and the overall design. These should be discussed before the main home design is too far along.
Bring inspiration, but explain what you like
Photos are useful when they are specific. Instead of only sending a folder of images, note whether you like the roofline, windows, materials, entry, layout, kitchen relationship, outdoor living, or overall feel.
Existing lots may need extra review
If the project involves an existing home, demolition, or a major rebuild, the old site improvements, utilities, drainage, and driveway access should be reviewed early. See our guide on demo and rebuild custom homes for more detail.
A good first meeting starts with organized information
You do not need every answer before starting, but having the basics ready makes the conversation much more productive. Our custom home design questionnaire is a good place to start if you are still organizing ideas.
Planning a custom home in Arizona?
Residential Design can help prepare residential plans for custom homes, demo/rebuild projects, additions, and detached structures in the Phoenix Metro area and surrounding Arizona communities. Send the property address, rough goals, and any documents or inspiration you already have.