COASTALCONSTRUCTION

Explore a scope and request a reviewed quote. Coastal confirms service availability, qualified trade partners, site conditions and final pricing before a proposal.

ADDITIONS & CONVERSIONS

Small home additions

Add a compact room while connecting the new foundation, roof and walls to the existing home. Establish what the extra space needs to do before choosing its footprint and the size of the opening into the house.

Get a quote Start my project Try the visualizer Explore options
Timber roof framing under construction
Troy Mortier · Unsplash License Stock reference photograph; not a Coastal project or specified product.

START WITH THE DETAILS

What goes into
the work.

Measure the proposed footprint, ceiling height and connection to the existing home. Separate new conditioned area from converted existing area.

Typical scope to confirm

  • Confirm room footprint and lot constraints
  • Coordinate foundation, framing and roof connection
  • Weatherproof exterior transitions and openings
  • Extend agreed electrical/HVAC services and finish the room

Make it specific to your project.

Enter the amount of work and choose the details you know. Your choices follow you into the Project Builder.

LOW / MIDDLE / HIGH REFERENCE

Low$125per sq ft
Middle$187.50per sq ft
High$250per sq ft

Low and high are published reference endpoints. Middle is their arithmetic midpoint, not a quoted average, product tier or firm price.

A planning reference for this service only. Selections, local labor, access, quantities and existing conditions need Coastal’s review. Do not add overlapping whole-project and component ranges.

HomeGuide · research checked 2026-10-22 · US national · installed

Continue with these selections ↗

What changes the price

  • Foundation and roof connection complexity
  • Room size and exterior matching
  • Structural opening and existing service capacity
What the reference covers
  • New room construction
  • Standard interior completion
Allow for these separately
  • Kitchen or bathroom fixtures unless specified
  • Unrelated whole-house remodeling
  • Unspecified kitchen/bathroom packages
  • Major existing-house structural upgrades

KNOW WHAT COMES NEXT

From first idea to finished work.

  1. Plan the scope

    Define the addition footprint and its structural and utility connections.

  2. Prepare and approve

    Develop plans, assess foundations, obtain approvals and order key products.

  3. Complete the work

    Build foundations and structure, tie in the envelope, then complete trades and finishes.

  4. Review and close out

    Complete inspections, restore access and review the finished addition.

Planning & preparation
6–16+ weeks
Work on site
8–20+ weeks

Illustrative planning allowance for the stated scope, not a promised start or completion date. On-site time starts after approvals and materials are ready; procurement, inspection waits, curing and discoveries can extend the calendar.

Engineering and approval scope · Tie-ins and occupied-home phasing · Site conditions, weather and procurement

PERMIT PLANNING

A permit is required for the stated scope

New buildings and substantial additions require building permits in OKC, Edmond and Moore. Confirm site approvals and any separate electrical, plumbing and mechanical permits for the selected address.

  • New dwelling or substantial new building
  • New enclosed floor area or change of use
  • New or altered utility systems

ENGINEERING & DESIGN

Engineering required for these conditions

Edmond requires an engineered footing design for the footprint additions covered by its alteration/addition checklist. Other locations and existing-space conversions need scope-specific structural review.

  • An Edmond footprint addition under the city alteration/addition checklist
  • New loads on existing framing or foundations
  • Unusual soil conditions or nonstandard structural details

Confirm requirements with the city or county responsible for the property before work begins. The address, exact scope and adopted code determine the final requirements.

Local permit & engineering sourcesOklahoma City — building and trade permits ↗ Edmond — when a permit is needed ↗ Edmond — residential alteration/addition checklist ↗ Moore — building permits and inspections ↗

MAKE IT FIT YOUR HOME

Your starting options.

Compare the scope before choosing products. Any direction can be refined with Coastal.

MATERIALS & DETAILS

Find your finish.

These original swatches show a general visual direction. Confirm a physical sample, exact finish code and product compatibility before ordering.

Exterior color direction

Interior finish direction

Illustrative stone-look tile finish

Stone-look tile

Illustrative tile direction; final material and slip rating are separate selections.

Use this direction

PRODUCT RESEARCH

Brands & real-world examples.

Manufacturer references help compare options. They do not imply a Coastal dealership, endorsement, or a product selected for your project.

James Hardie

Exterior siding to coordinate the addition with the existing home.

Explore example photos

Open the original source for product and installation imagery. These are reference links, not Coastal project photographs.

Home addition reference

Source addition photograph illustrates how a new room connects to a home. Example by the source, not a Coastal project.

YOUR PROJECT, VISUALIZED

Choose a direction.
See it in your space.

Start with common small home additions options, personalize the details, then upload a photo to create an AI concept.

Small office

Create a dedicated workspace with daylight and power planning.

  • Main color / finish: Soft white
  • Custom product, finish code, or request: Small office. Finish direction: Soft white. Create a dedicated workspace with daylight and power planning.
Use this look

Flexible room

Use a simple room layout that can adapt to changing needs.

  • Main color / finish: Blue gray
  • Custom product, finish code, or request: Flexible room. Finish direction: Blue gray. Use a simple room layout that can adapt to changing needs.
Use this look

Utility space

Plan practical storage and service clearances.

  • Space use: Utility / storage
  • Main color / finish: Sage
  • Custom product, finish code, or request: Utility space. Finish direction: Sage. Plan practical storage and service clearances.
Use this look
Timber roof framing under construction
Troy Mortier · Unsplash License Stock reference photograph; not a Coastal project or specified product.

FROM INSPIRATION TO YOUR SPACE

Your home. This direction.

The example photo is inspiration. Your personalized concept applies your saved service and finish selections to the photo you upload.

  1. Choose a preset and adjust its selections.
  2. Add a photo of the room or area.
  3. Create a concept, compare it, and keep it with your project.
Open the visualizer

AI concepts are illustrations. Product matches, measurements and feasibility require Coastal’s review.

YOUR NEXT STEP

Bring it into your plan.

Keep rooms, measurements and choices together in the Project Builder.

Save & plan a consultation Request a reviewed quote

Related scopes

Garage conversions Bedroom additions Bathroom additions Living space expansions
Research sources & pricing notes

Reviewed 2026-10-23. Published ranges describe the source’s stated scope and geography; they are not an Oklahoma adjustment or a Coastal estimate. Do not add overlapping project ranges together.

Stock photograph license · Finish swatches and scope diagrams are original illustrations.

Harbor

Coastal’s AI project consultant

Ready to help
Coastal Construction
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Speak or type; Harbor answers aloud. Your microphone stays off until you choose voice.

Service guide · prepared Coastal answers
AI chat uses your messages and selected project details; optional voice uses audio. OpenAI processes these when AI is used. An inquiry is sent to Coastal only when you submit it.

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