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.

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.

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.

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.

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.

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.

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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