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Whole Home Renovation

Renovation Interior Design: Blending Style With Function

How design decisions get made during a renovation, when to bring in a designer, and what they actually contribute.

By Mastaba Kitchen & Bathroom Remodeling Updated 22 September 2026 7 min read

Interior design during a renovation is not decoration applied at the end. The decisions that determine how a finished house feels are made early and are structural: where light comes from, how rooms connect, where you stand when you use each space, and what your eye lands on when you walk in.

By the time you are choosing paint, most of the outcome is already fixed. That is why design input, if you want it, belongs at the start.

$0 to $15,000 for design
Typical range
Design: 2 to 8 weeks
Typical timeline
n/a
Permit needed

What design decides, in order of importance

Light. Where natural light comes from, where it does not, and what you do about it. Adding or enlarging a window, changing a door to glazed, or borrowing light between rooms affects a house more than any finish choice.

Circulation. How you move through the house and what happens at each threshold. Most houses that feel awkward have a circulation problem rather than a decoration problem.

Sight lines. What you see from the front door, from the kitchen, from the bottom of the stairs. Design decisions that put something worth looking at at the end of a sight line make a house feel considered.

Then, and only then, materials, colour and furniture, which are the parts most people think of as interior design.

Levels of design input

  • Contractor-led, included. Layout, finish selection and specification as part of the build. Appropriate for most single-room and straightforward projects.
  • Interior designer, $3,000 to $9,000. Worth it for a whole-floor reconfiguration, a house where the rooms do not relate well, or where you want a coherent scheme across many rooms.
  • Architect, $8,000 to $15,000+. For structural change, additions, or anything altering the envelope of the house.

Mistakes we see most often

  • Bringing a designer in after the layout is fixed, which limits them to selecting finishes.
  • Designing rooms individually rather than as a sequence you move through.
  • Choosing a scheme from images of a differently proportioned, differently lit house.
  • Treating lighting as a finish decision rather than a design one.

What this means in the Capital Region

In older Capital Region homes the recurring design problem is light rather than space. These houses frequently have deep floor plans with rooms that get no direct daylight, and the fix is usually borrowing light: glazed internal doors, transom windows, an opening between rooms, or enlarging an existing window.

That is a design decision with a construction cost, which is precisely why it needs to be made at the beginning. Retrofitting daylight into a finished renovation is not really possible.

Want this priced for your own home? Jeffrey Mason will walk the project and give you a free written estimate. No obligation, no sales rep. Call (518) 308-6427.

Frequently asked questions

Do I need an interior designer for a renovation?

For a single room or a straightforward project, usually not; our design process covers it. For a whole-floor reconfiguration or a house where the rooms do not work together, a designer frequently pays for themselves.

When should design happen?

At the very start, before layout is fixed. The decisions that most determine how a finished house feels are made early, and by the time you are choosing paint the outcome is largely set.

What does a designer actually do?

At their best, they resolve light, circulation and sight lines, and then select materials coherently across the whole project. At their least useful, they only do the last part.

Can you work with my designer?

Yes, and we do regularly. We are comfortable building to someone else’s scheme or developing the design with you ourselves.

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