From a home addition idea to a plan you can actually evaluate

Describe the problem you want the space to solve

Do you need a quiet office, another bedroom, space for family visits or a more usable kitchen? Write down the people using it and the things that do not work today. Ask your designer to compare an internal layout change with an addition rather than assuming more square footage is the only answer.

Gather the existing conditions

Start with your own photos, available plans and a survey if you have one. Label measurements as confirmed or approximate. Ask the appropriate professionals to investigate property constraints, existing construction and building systems before treating a concept as feasible.

Compare two or three options

For each option, record the changes, the unknowns and what you like. In a concept render, flag added windows, removed walls or altered roof lines for review. A convincing picture can still contain dimensions or structural assumptions that have never been checked.

Make the next deliverable explicit

Ask for a scoped design or drafting proposal describing the drawings, revisions, professional review and fee. Keep construction pricing and required professional signatures or seals separately identified. A concept image, even a photorealistic one, is not a permit-ready plan or an approval.

Sources and further reading

This Old House: evaluating a second-floor addition ↗

Houzz Pro: photorealistic render tutorial ↗

Source checked September 20, 2026. Confirm current forms and case-specific requirements with the issuing authority. This checklist is not a technical design, professional opinion or permit approval.