House plan modifications | customize your dream plan

Want to personalize your dream plan without starting from scratch? Our modification services make it easy to tailor any stock plan to fit your unique needs, lifestyle, and lot requirements. Whether you want to add square footage, change the layout, update the exterior details, or modify structural elements, we connect you with experienced designers and architects.

DESIGN YOUR DREAM HOME YOUR WAY

With The House Plan Company's plan modification services, you don't have to settle! Modify any plan to perfectly fit your vision and lifestyle. Use the steps below to get started today.

  • Step #1
    Pick a Plan

    Browse our collection of expertly designed homes, garages, and multifamily plans. Use our Advanced Search or browse by style or collection.

  • Step #2
    Contact Us

    Each plan detail page has a modification request form. Simply click Get Started! 

  • Step #3
    Quote

    Your request will be sent directly to a HPC designer to evaluate and prepare a FREE modification quote.

     

    Quotes are prepared within approximately two (2) business days.

  • Step #4
    Design

    Once you have received and approved the modification quote you are ready to get started on the revision process!

  • Step #5
    Build

    Timeframe and design process will vary by designer but once your customizations are completed you are ready to move on to the next phase!

Want to work with a local design professional? Master Plan Packages are available and provide the copyright release permissions needed. Master Plan Packages vary by designer. 

Questions about Plan Packages & Copyright? Check out our FAQ page.

What types of modifications can The House Plan Company help me with?

  • Simple Customizations

    The following changes are easy to incorporate. In some jurisdictions these revisions are allowed without modifying the plans. Simple Customizations may include:


    • Changing exterior materials
    • Changes to non-load bearing walls
    • Changing appliance locations
    • Adjusting cabinet configurations
    • Updating electrical layouts

  • Moderate Customizations

    Below are examples of revisions that are significant and will require modifications to the construction documents. Moderate Customizations may include:


    • Adding or removing a room
    • Changing room configurations
    • A different foundation
    • Adding or relocating a fireplace
    • Changing exterior wall framing
    • Garage entry orientation changes

  • Complex Customizations

    Modifying a plan's footprint will significantly alter the original design and can result in major plan revisions. Complex Customizations may include:


    • Changing the footprint of the plan
    • Moving room locations
    • Adding a basement with floor plan
    • Altering or adding a second floor

Note about Plan Modifications: From simple changes to complex ones, HPC can help you customize any design!

With Simple Customizations, it is important to check with your local building professional before considering modifications in the field. Regulations and contractor preferences will vary. Even if your builder is comfortable with handling changes during construction you may want to consider modifying the plans. Accurate drawings help to avoid mistakes during the build phase and ensure your customizations are not forgotten!


Still have questions about plan customizations? Check out our FAQ page or Contact Us

Plan Modification FAQ

How do I submit a modification request?

To request a house plan modification from The House Plan Company, start by clicking the “Modify This Plan” button on any plan detail page. Fill out the form with a clear description of the changes you’d like to make; such as adding square footage, reconfiguring rooms, changing the foundation, or altering exterior materials.

For faster and more accurate quotes, include specific details and upload any sketches, marked-up plans, or inspiration photos. Once submitted, we’ll review your request and connect you with a professional designer or architect to provide a free, no-obligation estimate and timeline.

Need help with a design direction or starting the quote request process? Visit our Contact Us page or call our team directly—we’re here to help you customize your perfect home plan.

How much do modifications cost?

At The House Plan Company, the cost of house plan modifications depends on the complexity and scope of your requested changes.

  1. Minor modificationssuch as flipping the layout, adjusting window or door placement, or changing exterior materials typically start around $200 to $1,000.
  2. Moderate to major changeslike expanding square footage, reconfiguring room layouts, or altering the foundation—can range from $1,100 to $2,500+.

All modification requests are reviewed by a professional building designer or architect, who will provide a custom quote and estimated timeline before any work begins. There’s no cost to submit a request, and quotes are free with no obligation to proceed.

To get started, click “Modify This Plan” on any plan page or visit our Contact Us page to speak with our team.

How long does it take to complete modifications?

The time it takes to complete house plan modifications varies based on the complexity of your changes and the designer’s current schedule.

Each designer or architect we work with has their own unique timeframe for completing modifications. Simple updates—like moving windows or doors—may be turned around in as little as 5 to 10 business days, while more complex changes—such as reworking layouts or adding square footage—can take around 12 - 14 weeks.

When you submit a modification request, the designer will review your plans and provide a custom quote that includes both pricing and an estimated turnaround time. This ensures you know exactly what to expect before any work begins.

What types of changes are most commonly requested?

Common house plan modifications include flipping the layout, relocating windows or doors, changing garage orientation, adjusting ceiling heights, and updating exterior materials. Homeowners also frequently request larger changes like expanding square footage, reconfiguring kitchens or bathrooms, adding bonus rooms, or switching foundation types.

Each designer handles modifications based on their expertise and availability. Because every designer has a unique process and schedule, the estimated timeline for changes will be included in your custom quote after reviewing your request.

Can modifications include changing foundation types, wall framing, or other structural systems?

Yes, many house plan modifications include structural changes such as switching foundation types (e.g., slab to crawl space or basement), upgrading wall framing from 2x4 to 2x6, or adjusting roof pitch or roof framing. These updates are common and can help customize your home to meet local building codes, energy efficiency standards, or personal preferences.

In some cases, alternate foundation types and 2x6 exterior wall framing are available as quick checkout options. These pre-drawn changes can be selected directly from the “Plan Package Options” section on the plan detail page, allowing for a faster, simpler process without submitting a formal modification request.

For all other structural modifications, your request will be reviewed by an HPC partner designer or architect. Because each designer has a unique process and schedule, your custom quote will include both the estimated cost and timeframe for completing the requested changes.

To explore your options or start the modification process click “Modify This Plan” on any plan page or visit our Contact Us page to speak with our team.

Can I make changes after I've purchased the plan set?

Yes, you can request modifications even after you've purchased the plan set. Many homeowners decide to adjust their house plans after reviewing them more closely or working with a builder. Whether you want to move a wall, add a window, or make more significant structural changes, designers can typically accommodate post-purchase updates.

Keep in mind that some plan sets—such as PDF or CAD files—are more easily modified than printed copies, which may require a new digital version to complete your changes. It's also important to check the license type of your plan set, as certain licenses may limit changes without additional permissions.

Each designer has their own timeline and process, so once you submit your modification request, you'll receive a custom quote that includes both pricing and the estimated turnaround time.

Are plan modifications available for all stock plans?

Yes, modifications are available for all stock house plans offered. Whether you want to adjust room layouts, change exterior details, or make structural updates, every plan can be customized to better fit your needs and preferences.

When you submit a modification request, the HPC team of talented designers and architects will review your desired changes and provide a custom quote that includes pricing and an estimated timeline. Because each designer has a unique process and schedule, your quote will outline the expected turnaround time for completing your modifications.

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Thousands of home and garage plans exist online that can be searched as future homeowners envision their perfect house design. The odds that one design will include every desired feature a homeowner wants are slim however, and that’s where house plan modifications come in. Architects and designers are often able to adjust and refine plans to make the layout work or the style fit better with what a homeowner has in mind. These modifications, when made prior to the start of construction, can result in one of the most cost-effective ways for homeowners to create and customize their dream home.

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