How to Price Interior Design Services Without Undercharging

Pricing

28 Apr

Most interior designers set their fees based on what feels safe, not what the business actually needs.

You think about what the client might push back on. What other designers in your area are charging. Whether your number sounds "too much." None of that is pricing. That is guessing. And guessing consistently costs you money.

The fix is simpler than most designers expect. You need a real base rate, a structured approach to project fees, and scope that actually holds.

Pricing. Numbers. Scope. Those three things, done properly, stop the undercharging.

Choose a pricing model that fits the project

There are four main models for interior designers. Most experienced designers use a mix depending on what they're working on.

Hourly rate: You charge for every billable hour including design, sourcing, emails, site visits, and project management. Works well for smaller or undefined projects, but you must track time rigorously and have clear terms (and an ironclad design agreement) before you start.
Flat fee: One price for a defined scope. Easier for clients to budget, and it positions you as delivering an outcome rather than selling time. The risk is underestimating hours, so a buffer is non-negotiable. You will have to understand exactly how much time you spend on design tasks for this to be feasible.
Hybrid: A flat design fee plus hourly for revisions and extras, with a mark-up on procurement. This is the most common structure for full-service residential work, particularly in the US. It protects your time on changes while keeping the main scope predictable.
Percentage of project cost: Your fee is a percentage of the overall build or procurement budget. Works on high-budget projects where your time genuinely scales with complexity. This type of pricing is more common in high-end projects.

No single model is right. What matters is choosing deliberately, and making sure what you use actually protects your time.

Calculate your real base rate before you quote anything

This is where undercharging starts. Designers copy what others charge, or pick a number that feels reasonable, without ever checking whether that number covers their actual costs. Most designers tell me this is because they're frightened that they'll lose a job.

Run this calculation before your next quote:

Decide your target annual income. What do you need to earn personally from the business? Start here, not with what the market charges.
Add business costs. Software subscriptions, insurance, marketing, professional memberships, accounting, tools. All of it.
Estimate your billable hours. You can't bill every hour you work. Admin, marketing, and business development take time. A realistic figure for a solo designer is 900 to 1,200 billable hours per year.
Divide. (Target income + business costs) divided by billable hours = your minimum sustainable hourly rate.

Set a minimum project fee too. Even if you mainly quote flat fees, having a floor stops you from taking on small jobs that consume the same onboarding and admin time as a full project but pay a fraction of the rate.

Price each project from your numbers, not a guess

Once you know your internal rate, flat fees stop being a guessing game. Here's the process:

Break the project into phases: discovery, concept design, sourcing, drawings, contractor coordination, installation, admin.
Estimate hours for each phase, honestly. This means looking at your past projects, not your optimistic assumptions.
Add a buffer. Fixed-fee projects are where most undercharging happens because designers consistently underestimate client indecision, delays, and the hours that don't have an obvious line item.
Multiply total estimated hours (including buffer) by your internal rate.

An example: your internal rate is $150 per hour. You estimate 25 hours with a 20% buffer, so 30 hours total. Your flat fee baseline for that project is $4,500. You can round that into a clean package price. You can present it as an outcome-based fee without ever mentioning hourly rates. But now you know it's grounded in something real.

That's the shift. Not a number you plucked from what felt acceptable. A number you built.

Lock scope and revisions down before you start

Good pricing won't protect you if your scope is vague. Loose scope is the most common reason a well-priced project ends up being an underpaid one.

Every proposal should clearly define:

What's included: rooms, drawings, number of concepts, site visits, installation day, style of service delivery
What's not included: name it explicitly so it's not assumed
Revisions: include a set number in the fee, charge hourly or per round beyond that
Billable items: admin, sourcing, emails, project management, and travel are all billable. Name them in your agreement so there's no ambiguity later.

Scope clarity isn't about being rigid with clients. It's about being clear. Clients who understand what they're getting respect it more, not less.

Use AI to speed up your pricing workflow

Pricing takes time because it needs detailed hour estimates, scope documentation, and proposal writing. AI handles all of this faster than you can manage alone.

A workflow with Claude (or a properly briefed AI tool) that actually works:

"I'm an interior designer preparing a flat fee proposal for a full living room redesign. My internal hourly rate is [$X]. Here's my scope breakdown with estimated hours per phase: [paste your list]. Add a 20% buffer for scope creep and client revisions. Calculate the baseline fee, then write a one-paragraph scope summary I can paste directly into my proposal."

You can also use Claude to audit an existing proposal for scope gaps, draft revision language for your contract, or generate a project breakdown from a vague client brief.

It's not about automating your pricing decisions. It's about removing the admin friction so you can spend your time on the work that actually matters.

Final thought

Undercharging is rarely about not knowing your worth. It's about not having a number to stand behind.

When you know your base rate, when your scope is locked down, and when your fee is built from real hours and real costs, confidence follows. You don't need to justify your prices to every client who flinches. You need to know they're right. Build that foundation and holding your fees becomes a lot less of a negotiation.

Want to go deeper? Join the Design Success Circle, Joanne's free community for interior designers building smarter businesses. Come and share what you're working on. https://www.skool.com/designsuccesscircle/about