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Home Addition project

Home Addition Permit Plans

The drawings an addition needs: site plan with new setbacks, existing and proposed floor plans, elevations and the structure where the new meets the old.

Permit needed?
Yes, any addition that adds floor area needs a building permit.
Who reviews it
Building and zoning department, sometimes your HOA
Get Price Quote What You’ll Need
House with a new addition under construction
Usually needs
  • Full Permit Set
  • Engineer’s Stamp

Drawings you’ll need

What a Addition Permit Asks For

Counties don’t all ask for the same drawings. This is what they usually want for a addition; we confirm your county’s list in the quote.

Plan review

What the County Checks on a Addition Permit

The items reviewers look for first. Every sheet we draw shows them.

  1. 01

    Setbacks from the new walls

    Addition dimensioned to every lot line it moves closer to.

  2. 02

    Lot coverage

    Coverage before and after, where your code limits it.

  3. 03

    Existing vs new

    Old and new walls told apart on every plan.

  4. 04

    Roof tie-in

    How the new roof meets the existing one, in elevations.

  5. 05

    Structure

    Foundation for the new footprint and beams where walls open up.

Permit sent back with comments? We revise drawings to answer each one, including plans drawn by someone else.

Permit Corrections

What to send us

What to Send Us

  • Required
    Property addressSo we can check setbacks and coverage
  • Required
    What you’re addingRooms, rough size and where
  • Helpful
    Existing plans or measurementsOf the part of the house you’re adding to
  • Helpful
    Photos of each sideFor the elevations

Missing something? Send what you have. We start from county parcel records and aerial imagery, and ask if anything else is needed.

How it works

  1. 1

    Send the basics

    Use the quote form or WhatsApp. Two minutes.

  2. 2

    Approve your price

    We check your county’s requirements and reply with the price and turnaround. Nothing starts until you approve.

  3. 3

    Get your drawings

    Drawn to scale, ready to upload to your permit portal.

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Addition permit FAQ

Addition Permit Questions

Short answers to what people ask before ordering. Ask anything else in your quote request.

Get Price Quote

Reviewed by the MakeSitePlan drafting team
Updated October 2026

Which drawings does an addition need?

Usually a site plan, existing and proposed floor plans, elevations and structural details. Many counties ask for them as one set.

Do I need an engineer for an addition?

Often, for the foundation and any beam where an existing wall is opened up. We coordinate it through our licensed PE partner.

How close to my neighbour can I build?

It depends on your side setback, commonly 5 to 10 feet. We dimension the new walls to every line.

Can you draw my house as it is now?

Yes. From measurements, photos or old plans, we draw the existing house first, then the addition.