✦  Built for interior design firms

Billing that fits design.

Product markup, hourly retainers, and square-footage fees, chosen per project, invoiced beautifully, and added up into one clear picture of your profit. Serenza runs the money side of your practice so the spreadsheets can finally retire.

14 days free · no card required · export your data anytime
3ways to bill,
built in
1branded portal
per client
5 minfrom signup to
client-ready
0spreadsheets
left behind
The billing engine

Every studio bills its own way.
Serenza is built for yours.

Generic invoicing tools assume you bill one way. A working design firm doesn't: product is marked up, some projects run on retainers, others on flat fees. Serenza builds all three in from the start, and you choose how each project bills.

Product Markup

A per-category markup schedule prices every item automatically. Client invoices never leak your cost.

vendor cost $12,400 × lighting markup 25% client price $15,500 · margin $3,100

Hourly Retainers

Clients pay for a batch of hours up front. Your logged time counts down against it, and Serenza tells you when it's time to bill again.

retainer 40 hrs × $125 = $5,000 used 31.5 · remaining 8.5 status: bill soon

Square Footage

Set a price per square foot (room by room if you like) and bill it in stages as the project moves along. Nobody else does this properly.

3,200 sq ft × $15 = $48,000 40% deposit · 30% design dev · 30% completion deposit collected ✓

…and you pick how each project bills. Product markup keeps earning either way.

The client experience

Your brand on the front door. Ours nowhere.

Clients log in with a simple project code. No accounts, no passwords to reset, and they see a portal wearing your logo: hours, documents, budgets, mood boards, and selections waiting for approval.

  • Clients approve or decline each piece, and every answer is saved in writing
  • Proposals get signed right in the portal, and the deposit invoice is ready the moment they say yes
  • Share exactly the tabs you choose, per project
The bottom line

Know which projects actually make money.

Every project adds up its design fee, hourly or by the square foot, plus what you earn on product, minus what you spend. You always know which jobs are actually worth it.

  • See what hourly work earns next to flat-fee work, side by side
  • Your markup and card numbers stay hidden from junior staff
  • A file your bookkeeper can pull straight into QuickBooks
The back office

Everything a studio runs on, nothing it doesn't.

Client Portal

Hours, documents, budgets and mood boards behind one simple access code per project. Nothing is shown that you didn't choose to share.

Proposals & Signatures

Send the scope of work, collect a signature, and start with the deposit invoice already on its way.

Selections Approval

Clients say yes or no to each piece at the client price, and their answers flow straight into your orders.

Change Orders

When the project grows, your fee grows with it: dated, documented, and billed properly.

Purchasing & Orders

Track every vendor order and shipment, see which card paid for what, and invoice clients for product in a click.

Construction Budgets

Payment schedules, change orders, contractor fees, and cost per square foot, in the same format your builder already uses.

Receipt Scanning

Photograph a receipt and the vendor, date and amount fill themselves in. Time sheets too.

Reports & QuickBooks

Who owes you, what's overdue, where your hours go, and what each way of billing earns. Plus a QuickBooks-ready export.

From purchase orders to profit, in one place. Start Free Trial 14 days · no card
Why us

Born inside a working design studio, not a software committee.

Serenza started as the internal tool of a residential design practice, built order by order, invoice by invoice, against real projects. The purchasing and ordering side that most platforms treat as an afterthought is the part this one got right first.

  • Margins stay private.Roles for owner, bookkeeper, designer and assistant. Junior staff see the work, never your markup, card numbers or vendor costs.
  • Your data is yours.Download a full copy of your data anytime, with automatic backups every night in a second location. Leave whenever you like and take everything with you.
  • Client-ready from day one.A 5-minute onboarding brands your invoices and portal; the first proposal can go out the same afternoon.
  • Square footage, done right.Different rates by size, room-by-room breakdowns, staged payments and change orders: the way high-end firms actually quote.
Pricing

Priced like a tool, not a payroll line.

Solo
$49.99/mo
for independent designers
  • 1 login · 3 projects
  • All three billing models
  • Branded invoices & client portal
  • Proposals, selections, budgets
  • Expense & mileage tracking
Start Free Trial
Team
$149/mo
for established firms
  • Unlimited logins & projects
  • Everything in Studio
  • Full reporting suite
  • QuickBooks export
  • Onboarding assistance
Start Free Trial

Every plan starts with a 14-day full-featured trial. No card, cancel anytime.

FAQ

Fair questions, straight answers.

Do my clients need accounts?

No. Each project gets a private access code. Clients enter it once and see only what you've shared for that project. No passwords to reset, no seats to pay for.

Can I mix billing models across projects?

Yes, that's the point. Pick hourly or square-footage per project when you create it; product markup applies everywhere. You can switch a project later; Serenza asks you to confirm and keeps a record of the change.

What happens to my data if I leave?

One click downloads everything you've ever entered, and automatic backups run every night the whole time you're a customer. Your data is never held hostage.

Does it replace QuickBooks?

No, it works alongside it. Serenza runs the studio side of the money (fees, markup, retainers, client invoices); the QuickBooks export hands your bookkeeper clean, ready-to-import numbers.

Is my markup visible to clients or juniors?

Never to clients. Invoices and the portal only show client price. Inside the studio, role permissions hide margins, vendor costs, and card data from designer and assistant roles.

Run the studio like it's designed.

Set up your firm in five minutes. Send the first branded invoice today.

Start Free Trial
14 days free · no card required
Contact

Questions? Just ask.

Tell us a bit about your studio and we'll show you exactly what Serenza takes off your plate, from the first order to the final invoice.