Line Arch Design

Home Addition Plans

Complete design and construction documents for residential additions.

Side of a modern stucco home with a raised pool terrace, a garage, and layered planting.
Helena ResidenceCustom home01
Two-story modern farmhouse with white brick, a wood-clad gable, a metal roof, and a long drive at sunset.
Modern Farmhouse ResidenceCustom home02
Starts with
The existing structure and what zoning allows
Delivered
Architectural, structural, and MEP documents
Focus
The tie-in to the existing home

What Home Addition Plans Covers

We review the existing structure and site conditions, confirm what zoning allows (setbacks, lot coverage, height), and design the addition and its connection to the existing home.

The scope covers floor plans, elevations, sections, details, structural, and MEP as required for the tie-in, coordinated across all disciplines.

Front elevation of a single-story modern stucco home with a wood entry door and symmetrical window bays.
Single-story cream home with a tile roof, a columned entry portico, and a side garage among palms.
Two-story modern farmhouse with white brick, black gables, a tall glass entry, and palms at sunset.

Frequently Asked Questions

Does a remodel or addition follow a different timeline than new construction?

The same production breakdown generally applies. What changes is the front end: intake and the existing-conditions phase can take longer on a remodel or addition, since that stage depends on the accuracy and availability of documentation for the existing property. Once conditions are coordinated, the project follows the same path as new construction.

Can you design a custom home from scratch, or do you also handle additions and remodels?

Both. We design new custom homes, and we handle additions and remodeling projects, with many remodeling projects already permit-ready. The difference is where the work starts. A new home starts from the site and the program, while an addition or remodel starts from documenting what already exists before anything new is drawn.

Can I bring plans or drawings from a previous architect or designer?

Yes. If you started with someone else, we can take that work into consideration. We would only consider using the design itself: documentation, engineering, and permitting are done fresh by our team, and a new project quote applies. Permitting is a separate service with its own price. Send what you have ahead of the first call and we will review it before we talk.

What are the stages, from the first meeting to a permit-ready set?

Four stages carry a project from the first meeting to a permit-ready set: coordinating existing conditions, developing the layout, producing construction documents, and carrying the set through plan review until the permit is issued. Each stage closes with your approval before the next one opens, and engineering and site plan work run in parallel with the drawing set.

What do you need from me to keep my project on schedule?

Each stage needs specific things from you: a signed proposal and a completed intake form to start, timely feedback and approval on each layout, and any missing documents, such as your survey or site information, as they come up. If something is missing, we hold that stage until we receive it, so responding promptly is what keeps your project moving.

See all questions

Single-story home with a gray metal roof, a recessed wood entry, stone garage piers, and a stepped front walk.

Start Your Addition Plans

Send the address, what you want to add, and any drawings you already have. We will confirm what your parcel allows and quote the plan set.