Why Interior Designers Should Stop Using Excel for Specifications

Excel is a habit, not the best solution

Most interior designers start managing specifications in Excel or Google Sheets. It makes sense: spreadsheets are free, familiar, and flexible. But with experience, it becomes clear that Excel was built for financial calculations, not for managing design projects.

This doesn't mean Excel is a bad tool. It's excellent at what it was designed for. But an interior design specification is not a financial spreadsheet. It's a document with images, links, approvals, and version control — things spreadsheets weren't built to handle.

Problem 1: Manual data entry

Every product in a specification needs a name, brand, dimensions, price, image, and link. In Excel, all this information must be copied manually — open the supplier's website, find the data, paste it into cells.

For a specification with 100–150 items (a typical apartment project), that's 10–15 hours of pure copying. Specialized tools with AI parsing reduce this time by 3–5×.

Problem 2: Images

Excel was not designed for working with images. Inserting product photos into cells is an art of its own — resizing, aligning, and dealing with constant shifting when new rows are added.

Google Sheets limits images to the IMAGE() function, which shows tiny previews without the ability to see the product in detail.

As a result, many designers simply skip adding images to the spreadsheet — and the specification turns into a dry list of SKUs that's hard for clients to evaluate.

Problem 3: PDF export

Clients expect a professionally formatted document. Exporting a spreadsheet to PDF without hours of manual formatting produces a result that looks like... a spreadsheet. Not a professional document from a design studio.

Adjusting margins, column widths, page breaks, headers, and footers for each project individually is routine work that takes time away from creative tasks.

Problem 4: Client approval

Excel has no built-in approval workflow. The typical process:

1. Designer sends a PDF or Google Sheets link
2. Client writes comments in a messenger or email
3. Designer makes changes
4. Repeat until everything is approved

This process generates dozens of messages and version confusion. Who approved what? Which version is current? Where was that comment about replacing the sofa?

Problem 5: Formulas break

Anyone who has worked with large spreadsheets knows this pain: you add a row, and the subtotal formula doesn't include it. Or you delete an item and get #REF! instead of a sum.

In a project with 5–6 rooms and 150 items, formulas become fragile. One error — and the budget is wrong. The client sees an incorrect total — and trust drops.

Problem 6: No product library

If you use the same paint supplier or hardware in multiple projects, in Excel you have to copy the data from scratch every time. Specialized tools let you save products to a library and add them to new projects with one click.

When Excel is enough

Honestly, for some scenarios Excel works just fine:

• You're just starting out and have 1–2 projects per year
• Your projects are small (under 30–40 items)
• You don't send the specification to the client (you use it only for yourself)
• You already have a perfectly tuned template that works

If that's you — keep using spreadsheets. They work. Just not as efficiently as a specialized tool.

When it's time to switch

If you notice that:

• You spend more time formatting the spreadsheet than selecting products
• Clients get confused by specification versions
• You have a library of favorite suppliers that you recreate in every project
• You're embarrassed to send the PDF version of your spreadsheet to a client

...then it's time to try a specialized tool. Dora, Programa, Studio Designer — each has its own strengths. Try a few and choose the one that fits your workflow.