How can I modify a plan from Our collection

Found a plan you love, but want to personalize it ?

Our team can modify any of our models to suit your needs : whether you’d like to add a bedroom, expand the garage, or redesign the layout.

Share your ideas with us before purchasing your plan to save money, speed up the process, and avoid costly surprises during construction.

Get your free online quote Modify an existing plan
Gianluca from our Laval office

Every One of Our Plans Can Be Customized !


Original plan
plan modification

*These images depict a modified version of the original plan and are not available for purchase as illustrated. We invite you to contact one of our 30 regional offices to customize an existing plan or develop a fully custom design tailored to your needs.

Customize your plan and order online or visit a Drummond House Plans regional office.

modified plan

Modified plan

How much does it cost to modify a plan?

The cost of modifying a plan is calculated simply

Base price of the selected plan

+

modification fees

(hourly rate)

On average, the total cost of a construction-ready plan, including your requested modifications, represents between 0.75% and 1.25% of the home’s total construction value.

You will receive a detailed written estimate outlining our scope of services and the initial delivery timeline before any work begins or approval is required.

Find our nearest regional office

Delivery timeline for a modified plan

The delivery timeframe for a modified plan typically ranges from a few days to several weeks, depending on several factors :

  • The time of year, based on workload and the number of active projects
  • Time required by the client to review, reflect, and approve the proposed changes
  • Adjustments or design changes made during the process

Every project is unique, and our team ensures a realistic timeline is established from the start to meet your expectations and deliver a plan that reflects your vision.

Our residential architecture services

Modification of the selected house plan

based on one of our 1500+ designs.

Submit a request
Custom plans

Custom home design, from scratch

Get a quote

Home renovation plan

Work with us

6 steps to modify your house plan

To avoid expenses and delays it is important that you prepare details for your new construction project before buying your house plan and contacting us. Here are the important information regarding your future home plan that you need to collect prior to contacting us:


  • Buy the land and verify with your municipality about the rules governing your area such as setbacks, mandatory building materials, etc.
  • Verify your available financing for the construction of your house or cottage from your banking institution.
  • List the essential elements of your custom home design. This list varies from one family to another and must include: the desired architectural style, the number of bedrooms and bathrooms, required additional rooms such as an office, a gym, a games room, a sheltered balcony (rear or side), desired type of foundation, etc.
  • Add photos and / or sketches, as needed.

Choose your plan from one of our house plan collections below: click on the link below and you will access all of our plans. Once on this page, use the filters provided in the left column to obtain a group of plans corresponding to your specific criteria (price, number of rooms, style, etc.).

Find my dream house plan

Choose the regional office nearest you and make an appointment. One or more meetings with a Drummond Design expert will allow us to understand your family's needs in terms of space and lifestyle and ensure that your customized plan will correspond to your exact expectations and your budget. We can also visit your home or site of construction, if you wish ($).

Within 7 working days following the receipt of your documents by email or a meeting at one of our 30 Drummond House Plans regional offices, or at a time agreed between us, a written estimate and details regarding our service offer and timelines regarding initial project delivery will be provided for your approval. The delivery time of a construction plan can vary from a few days to a few weeks depending on the time of year. Following the receipt of your preliminary plans, timelines may be readjusted depending on the time required for your reflection and the number of revisions required.

Following the approval of our estimate (STEP 3) as well as acceptance of the delivery timelines of your final plan, sketches can be made for you to ensure that we have the same vision as you have of your project.

  • We will then proceed with the production of the preliminary plan which may include, among other things, floor plans and elevations of the 4 sides of the house, or any other information relevant to your project.
  • We will then follow up by emailing or handing over your preliminary plan to ensure that all details are in line with your expectations. If you wish, and we have provided for by agreement, different design options can be presented to you.
  • At this stage we will make corrections as needed until the entire plan is perfect for you. One to three discussions or meetings are usually enough to allow you to approve the final project.
  • It is always possible to add various additional services to your plan such as the electrical plan.
  • At this stage it is also best to get quotes from one or more construction contractors.
Additional services Technical information

The preliminary plan is 100% to your liking? Your Drummond House Plans professional then proceeds to the detailed development of all of the construction drawings for your project.

Receive your final construction plan for your future house or cottage, in small or large format PDF and / or the number of printed blueprints you want, and as agreed to in your estimate.

You now have all the information you need to meet the contractor of your choice and get quotes for your construction work. The Drummond House Plans design team will also be available to answer your questions or those of your contractor before or during the work.