How to Build a Professional Construction Quotation (2026 Guide)
The quotation is the first thing your client sees of you, and the single biggest factor in whether you profit or lose on a contracting job. A vague quote, a missing item, or a wrong order of tax and profit can cost you the whole project — or quietly eat your margin. In this guide you will learn step by step how to build a professional, transparent quotation: how to break the work into items with their quantities and unit prices, how to compute the items subtotal, then add the profit margin, then 15% VAT — in the correct accounting order that protects your profit and matches the Saudi VAT system. Every value here matches exactly the free Quotation Builder on “Site Engineer,” so you leave with a client-ready quote in minutes.
🧮 The Quotation Formula (in the Correct Accounting Order)
- Each item total: quantity × unit price
- Items subtotal: sum of item totals = Σ(quantity × price)
- Profit margin: subtotal × profit% ← added first
- VAT: (subtotal + profit margin) × 15% ← computed after adding profit
- Grand total: subtotal + profit margin + VAT
The critical point: VAT is computed on the amount after adding the profit margin (subtotal + profit), not on the items alone. This is the correct accounting order because the taxable selling price is the final price the client pays, inclusive of your profit. Reversing the order — charging VAT before profit — understates the tax due and violates the VAT system.
📋 Steps to Prepare a Professional Quotation
- Break the work into items: Split the project into clear items (excavation, concrete, steel, block, plaster…) — each item must be measurable and priceable on its own.
- Determine the quantity per item: Compute each item’s quantity in its correct unit (m³ for concrete, tons for steel, m² for block and plaster) from the drawings or from quantity calculators.
- Set the unit price: Set the all-in unit price (materials + labor) for each item per local market prices and execution time — use the reference table as a starting point.
- Compute the items subtotal: Multiply quantity × unit price for each item, then sum all totals to get the items subtotal.
- Add the profit margin: Set a realistic profit rate (10–20% is common in contracting) and compute its value = subtotal × rate, then add it.
- Add VAT and issue the quote: Compute 15% VAT on (subtotal + profit), add it for the grand total, then issue the quote with the project name, client, and validity date.
✅ Worked Example: Villa Shell Quotation
A quotation for the shell of “Client Ahmed’s” villa with five items, 15% profit margin and 15% VAT:
Note that VAT (35,294) was computed on 235,290 (subtotal + profit), not on 204,600 alone. Enter the same items in the Quotation Builder and you'll get the exact same result — these values come from the calculator's own formulas.
📊 Indicative Unit Prices for Construction Items (SAR, 2026)
| Item | Unit | Indicative unit price (SAR) | Notes |
|---|---|---|---|
| Excavation & backfill | m³ | 35–55 | Depends on soil type and depth |
| Reinforced concrete (incl. pour) | m³ | 350–420 | Includes concrete, labor, formwork |
| Reinforcement steel (supply & fix) | ton | 2,700–3,100 | Tracks the volatile steel price |
| Blockwork | m² | 42–55 | Depends on block thickness and type |
| Plastering | m² | 20–28 | Two faces: internal/external |
| Painting | m² | 18–30 | Depends on type and number of coats |
🛡️ The Saudi Angle: VAT (ZATCA) & Local Pricing Norms
In Saudi Arabia, Value Added Tax (VAT) is currently 15%, administered by the Zakat, Tax and Customs Authority (ZATCA). Tax-registered businesses must add it to their invoices and quotations. The key accounting point: VAT is computed on the taxable price = items value + profit margin, because your profit is part of the selling price the client pays. That is why, in the example, VAT was computed on 235,290 and not on 204,600.
Useful local pricing norms: a common contracting profit margin is 10–20% (higher for small or high-risk jobs); make the unit price all-in (materials + labor + waste) to avoid later claims; set a validity period for the quote (e.g. 15–30 days) since steel and cement prices are volatile; and state clearly what is out of scope (land, designs, permits) in the quote.
🚫 Common Quotation Mistakes
- Computing VAT before profit: VAT is on (subtotal + profit), not the items alone — reversing the order understates the tax due and breaks the rules.
- Forgetting VAT entirely: if you are tax-registered, omitting the 15% means it comes out of your actual profit at supply.
- An unrealistic profit margin: too high loses the job, while too low or zero leaves you working for no profit — or a loss at the first surprise.
- Vague or missing items: a “miscellaneous works” line with no clear quantity and price invites disputes; itemize each with its unit and quantity.
- A non-inclusive unit price: omitting labor, waste, or transport from the unit price eats your profit later; make the price all-in.