Build a clear, itemised room-by-room estimate at your own rates, then turn it into a professional quote you can send and get paid on. Free to estimate, no signup needed.
Most designers still price a project in a spreadsheet that takes hours and looks like one. The estimate calculator does the maths for you, room by room, and hands the client a document that looks like your work, not a formula.
Add the rooms
Living, bedrooms, kitchen, bath. Pick the rooms in scope for this project.
Scope the work
Furnishing, cabinetry, lighting, design fee. Every line is editable to your pricing.
See the total
An itemised, room-by-room total updates live, shown in your own currency automatically.
Send as a quote
One click carries the lines into Billbooks as a branded quote you can send and invoice.
It ships with sensible US market presets by room and quality tier, then gets out of your way. Change any rate, add a room, tick an add-on. It stays your estimate, not a fixed price list.
The same estimate, worth something a little different depending on who is holding it. Three illustrative scenarios.
She wins work on taste, then loses evenings rebuilding the same spreadsheet for every enquiry, and quietly under-charges to seem competitive. Now she scopes a home on the calculator during the site visit and emails a clean quote the same day, at rates she can defend.
Every designer quoted from their own gut, so the same project could come in three different ways and the founder re-checked each one. With one shared set of room rates, quotes go out consistent and on-brand no matter who built them, and approvals come back faster.
At volume, the risk is not a slow quote, it is inconsistent ones: mismatched scopes, margins that drift, a client asking why two homes priced differently. Standardised room templates give every project manager the same starting point, and each estimate becomes a tracked Billbooks quote and invoice.
Photograph an old invoice or drop in a PDF. Billbooks reads the client, the dates, the line items, the tax and the currency, and gives you back a real invoice you can edit rather than a file you have to store.
Interior design work is priced room by room, so the estimate matters more than the invoice. Billbooks builds an itemised estimate at your own rates, converts it to a quote the client signs, and turns that into an invoice without retyping any lines.
List each room as its own set of line items with your rates for materials and labour, and Billbooks totals the project while keeping the breakdown visible. The client sees what each room costs rather than a single figure for the whole job.
Yes. Billbooks quotes carry a digital signature, so a client can accept and sign online, and the accepted quote converts straight to an invoice. That removes the print, sign and scan step that usually delays the start of work.
No. Billbooks prices and bills the project. It does not carry supplier catalogues, mood boards or 3D room visualisation, so interior designers use it alongside their design tools rather than in place of them.
Yes. Group the line items by room so the client sees what the bedroom costs against the kitchen, rather than one figure for the whole project. That breakdown is usually what gets an estimate approved without a round of questions.
Yes. Update the estimate and reissue it, keeping the earlier version in the history. On interior work where scope moves room by room, being able to show what changed and when is what keeps the conversation about design rather than money.
Yes. Invoice a deposit against the accepted quote before you order, then bill the balance on completion. Both sit against the same project, so the client can see how the total was reached.
Yes. Record supplier costs as expenses against the project and add them to the estimate or invoice as billable lines, shown separately from your design fee.
Yes, estimating is completely free with no signup. You only create a Billbooks account when you want to send the quote or invoice.
Yes. It starts with sensible market presets by room and quality tier, and every line and rate is editable to match how you price.
It shows totals in the visitor's own currency automatically, based on their country, so a US designer sees dollars and others see their local currency.
Yes. One click carries every line into Billbooks as a branded quote you can send, and convert to an invoice when the client approves.
An app so good you will want to get tasks done instead of putting them off. Stay on track and keep your cashflow going.
A little kit of calculators and generators, on the house.
30-day free trial. No credit card required.
Open the estimate calculatorPairs with Invoicing for freelancers, Quotes and estimates, and the free quote generator.
Clients approving a scheme are usually on their phone. Send an invoice, quote or proforma straight from Billbooks in one tap. It shares the same secure link the client would get by email, so they can view it and pay from the message, and you still see when it was opened.