How Interior Design Firms in India Can Stop Losing Margin on Procurement and Site Changes

Most interior design and fit-out firms price a job carefully. The quote has materials, labour, a margin and a buffer. Then the job starts, and the margin on paper slowly turns into a different number at the end. It rarely happens because of one bad decision. It happens through purchases nobody tied to the job, changes nobody priced, and material that left the store and was never accounted for. This guide walks through where that leakage usually comes from and the controls that stop it, without adding paperwork your team will ignore.

Why margin leaks after the quote is signed

The quote is prepared in the office, by people who think in totals. The job is delivered on site, by people who think in tasks. Between the two sits procurement, which in many studios is a mix of phone calls to vendors, WhatsApp photos of bills and a supervisor who pays cash to keep work moving. Every one of those is reasonable on the day. The problem is that none of them automatically lands against the job, so the cost of the job is only known when someone reconciles it, usually too late to do anything about it.

The leaks tend to fall into four groups:

• Buying without a purchase order. Material is ordered verbally or paid from petty cash, so it never appears against the job until the bill arrives, if it is matched at all.
• Unpriced site changes. The client asks for a different finish, an extra shelf or a moved electrical point. The site team does it to keep the client happy, and it is never added to the job value.
• Wastage, damage and returns. Off-cuts, breakages and unused stock go back to the store or stay on site, and nobody records which job paid for them.
• Rate drift. The quote assumed one rate for a material; the actual purchase happened later at another rate, from another vendor, and nobody compared the two.

Control 1: Every job-related purchase goes through a PO

A purchase order is not bureaucracy; it is the moment a cost is attached to a job before the money is committed. The simplest workable rule is: anything bought for a specific client job, above a small petty-cash limit, needs a PO raised against that job. The PO names the vendor, the items, the quantities and the rate.

Three details make this rule stick:

1. Keep the approval fast. If approving a PO takes two days, people will go around it. A single approver per job, with a phone notification, is usually enough.
2. Use your own catalogue. When items and units come from one product and material list, quantities and rates are comparable across jobs and vendors.
3. Match the bill to the PO. When the vendor invoice arrives, compare it to the PO. Differences in rate or quantity are the conversation to have with the vendor, not something to discover at year end.

Control 2: No site change starts without a price and an approval

Site changes are where good relationships quietly cost money. The fix is a short, consistent routine that the site team can run in a few minutes:

1. Record the change with a photo and a one-line description, against the job.
2. Price it in the office using the same catalogue rates as the original quote.
3. Send it to the client for approval, and keep the approval on the job, even if it is a reply to a message.
4. Only then release the work and raise any purchase orders it needs.

Clients generally accept this when it is explained at the start of the job as how you work, not introduced in the middle of a disagreement. It also protects the client: they know what they are paying for before the work is done.

Control 3: Know what is in stock and where it went

Many studios keep a small store of common materials and hardware. Stock is money, and when it moves between jobs without a record, one job looks profitable while another quietly carries its cost. Keep a simple inventory: what came in against which PO, what was issued to which job, and what came back. Even a weekly count of the most expensive items is better than none.

Control 4: Compare quoted and actual costs while the job is running

The value of tying POs, changes and stock to the job is that you can compare the quote with actual commitments while there is still time to act. A weekly look at each running job, quoted versus committed, by major category, catches rate drift and scope creep early. It also tells you which kinds of work you consistently under-quote, which is the most useful input for your next quote.

A note on GST

For Indian firms, procurement discipline has a tax side too. Purchase bills that are recorded properly, with the supplier's GSTIN and correct invoice details, are the starting point for claiming input tax credit where your business is eligible. Bills that live only in a phone gallery are easy to lose. The rules on eligibility and documentation can change and depend on your situation, so treat this as general information and confirm the details with your chartered accountant or the official GST portal.

Make the routine easy for the site team

None of these controls work if they only live in the office. The site supervisor is the person who sees the change request, receives the material and notices the breakage. Give them a way to record it from the phone, with photos, that still works when the site has poor signal. In Nurexify Interiors, the site app has an offline mode for exactly this reason, and updates sync to the job when the phone is back online.

A simple checklist to start with

• Set a petty-cash limit and a rule that job purchases above it need a PO.
• Build one product and material catalogue and use it for both quotes and POs.
• Agree a site-change routine: photo, price, client approval, then work.
• Record stock in, stock issued to jobs, and returns.
• Review quoted versus committed cost on every running job once a week.

Start with one or two of these on your next job rather than all five at once. The first time a change is priced and approved before the work starts, the routine tends to sell itself.

This article is general information, not tax, legal or accounting advice. Tax rules change and depend on your circumstances; confirm them with a qualified adviser.