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Invoicing for interior design firms

Know what is owed.
Know what it belongs to.

Create the invoice from work already approved, follow every payment, and keep the estimate, retainer, purchase orders, notes, and documents connected to the same financial record.

Get started See invoicing in Workroom
Designer pulling a drawing set from the studio plan chest beside a table of finish samples
The invoice is one part of the project—not a record floating by itself.
Invoice · INV-3021Robin Residence
Partially paid
Invoice total$42,490
Paid$28,400
Balance due$14,090
67% paid
Design fees · Phase 2$42,490
Schematic DesignApproved estimate scope$18,500
Design DevelopmentPhase fee$22,750
Reimbursable expenses7 attached receipts$1,240
Last reminder · Jul 24

Trusted by the studios doing the work

The connected financial record

Open the invoice. See the entire paper trail.

Every finance page includes a Linked column, so your team can move between the documents that explain the transaction without searching folders or relying on memory.

01EST
Estimate · EST0054The client-approved scope and pricing
Linked
02INV
Invoice · INV-3021$42,490 billed · $14,090 remaining
Current
03RET
Retainer · RET-PROJ-006$6,200 applied to this invoice
Linked
04PO
Purchase orders · 3The product commitments behind the billing
Linked
Client-view controls

Show the client what helps them decide—and protect the approval.

Choose the commercial details, product information, and approval level the client sees. If they approve an entire section at once, Workroom asks for their initials before recording the decision.

Show to client
Dining Room · 4 itemsSection approval
Solara Dining TableFinn Dining ChairsLeano 52 ChandelierFreight & receiving
Payment progress, without the detective work

See what happened after send.

Follow the balance from invoice to deposit to final payment. Keep reminders, payment notes, and supporting documents on the record your team is already reviewing.

  • See sent, viewed, partially paid, paid, and overdue status
  • Send a reminder from the invoice record
  • Record card, bank transfer, cash, or other payments
  • Apply a payment to the correct invoice or schedule
INV-3021 · payment progress$14,090 remaining
$28,400 of $42,490 collected
  1. ✓Invoice sentJul 18 · 9:42 AMDelivered
  2. ✓Client viewedJul 18 · 11:06 AMSeen
  3. $First payment receivedWorkPay · $28,400Paid
  4. ↗Payment reminderJul 24 · note includedSent
  5. ○Remaining balanceDue Aug 2$14,090
The conversation stays with the money

Notes, documents, attachments, and activity—on the invoice.

Notes

Keep internal context out of the client email thread

AM

Apply the remaining product retainer first.Internal note · Jul 24

Documents

The files that support the amount stay attached

PDFReceiving-summary.pdf1.8 MB

ZIPExpense-receipts.zip7 receipts

Activity

A visible history of every meaningful change

Payment recordedJul 22 · WorkPay

Reminder sentJul 24 · by Amanda

Versions

What changed, who changed it, when, and why

V3Freight updated from $980 to $1,240Jul 24 · 2:18 PM · Amanda M.Note: Updated to the final vendor freight quote.

V2Retainer RET-PROJ-006 appliedJul 22 · 10:04 AM · Chris B.Note: Apply available service funds before requesting the balance.

V1Invoice created from EST0054Jul 18 · 9:38 AM · Amanda M.Created from the client-approved estimate.

Workroom versus a disconnected billing workflow

The difference is everything the invoice still knows.

CapabilityWorkroomTypical billing tool
Estimate, retainer, and PO linksVisible on the finance recordManual cross-reference
Payment progress and remindersKept with the invoiceSplit across tools or email
Client-view controlsChoose what appearsOne fixed document view
Approve-all protectionInitials + timestampBasic approval button
Notes, files, and activityAttached to the recordStored elsewhere
Document version historyWhat, who, when + noteLatest version only
Project context after paymentPreservedReduced to a transaction
Set it once, per firm

The late fee you never enforce because it is awkward

Nearly every design contract has a late-payment clause. Nearly nobody applies it, because doing so means a designer deciding, personally, to charge a client they will see again next Tuesday. So the clause sits there and the receivable ages.

Set it once and it is policy rather than a confrontation. A percentage or a flat amount, calculated on the amount due or the full balance, after a grace window you choose. It is applied one time per invoice — not compounding, which is the version that turns a slow payer into a dispute.

  • Percentage or flat fee, applied once per invoice
  • Calculated on the amount due or the whole balance
  • Grace days before anything is added
  • Retainer terms auto-injected into every new retainer

Retainers →

InvoicesNumbering, memo, terms, processing fee, retainer terms, late fees + approval workflow.
Late payment fee
Enable late payment feesAny invoice that passes its due date + grace window with a balance owing gets a one-time late fee added.
Fee typePercentage (%)
Fee percentage30
Percentage ofAmount due only
Grace days1

Applied once per invoice — not compounding, and not per day.

Default retainer terms & conditions
Auto-injected into every new retainerOne line per term, editable per retainer on the invoice form.
+ Add line
Invoice prefixINVOICE
Invoice digits5
Keep the financial story intact

Send the invoice without losing the project behind it.

See how Workroom connects approvals, retainers, purchase orders, payments, notes, files, and accounting around the same interior design project.

Book a guided demo Explore retainers →