# Roof waterproofing cost in Al Ahsa: how to compare quotations Compare roof waterproofing offers by measured scope, preparation, specified system, roof details, inspection and warranty instead of an isolated square-metre rate. Bunyady · 2026-10-15 Two quotations for the same roof can describe quite different jobs. One may include removal of unsuitable existing material, repairs and treatment around equipment; another may price only the main open surface. Before asking which rate is cheaper, establish what each contractor has allowed for. A useful comparison starts with the condition of your Al Ahsa property and ends with a documented, usable roof. This guide explains how to organize that comparison without presenting an unverified local price range. ## Ask each bidder to price the same measured scope Prepare a simple roof plan showing the areas to be treated, access points, drains, upstands and existing equipment. Ask how each contractor measures the work and whether vertical details or small separate areas are priced independently. Record exclusions beside the drawing. A quotation based on the building footprint may not explain the actual waterproofing scope. Give every bidder the same information and have uncertain measurements confirmed before comparing the total, so the difference reflects the proposal rather than different assumptions about quantity. ## Separate preparation from the new waterproofing Ask what the contractor observed during the visit and which existing materials will remain. The offer should identify cleaning, removal, repairs and other preparatory work considered necessary for the proposed system. Where a condition cannot yet be established, request a stated allowance or a method for agreeing the additional scope. Do not describe an unknown repair as included without a boundary. Ask who assesses the existing roof and who confirms that the prepared surface is suitable before application begins. ## Name the complete proposed system Request manufacturer and product references for the layers and details included in the offer. Sika’s RoofPro GCC documentation, for example, describes substrate priming as part of its system; a product name alone does not describe the whole installation. Ask the contractor to provide the current instructions for the actual selection and explain its suitability for your roof. Keep any proposed alternative separate, with its own scope and total. The manufacturer's example is a reminder to read the system, not a recommendation to use that product everywhere. ## Include the details around everyday roof equipment Walk through the planned treatment at drains, door thresholds, parapets and equipment supports with the responsible team. Identify who moves or protects items and who reinstates affected services. These interfaces can be missed when an offer simply multiplies an open area by a rate. Ask whether future maintenance access has been considered and whether another contractor must complete work first. Record the agreed boundaries so that an apparently complete waterproofing quote does not leave essential coordination to be discovered during installation. ## Compare inspection, handover and warranty terms Request the proposed inspection records and the professional responsible for deciding which checks are suitable for the system and building. Do not prescribe a water test or its duration from a generic online example. Ask what documents you receive at handover, how defects are reported and which party provides each warranty. Read exclusions and owner maintenance duties before choosing. A long warranty headline cannot substitute for a clear record of the products, installed scope, inspection results and route for arranging a service visit. ## Create one comparison sheet before accepting an offer Use columns for the measured work, preparation, system, interfaces, access arrangements, checks, exclusions and total. Ask bidders to clarify blank entries in writing. Separate confirmed costs from provisional items and optional upgrades, and check whether taxes and ancillary services are treated consistently. If an offer is revised, retain the dated replacement and its scope. Choose on the basis of an understandable complete proposal and responsible execution, rather than assuming that the lowest unit price will produce the lowest finished-project cost. ## Your practical checklist 1. Give bidders one annotated roof plan and measurement basis. 2. Identify preparation, uncertain repairs and excluded work. 3. Request product references, interface details and suitable inspections. 4. Compare full totals alongside handover and warranty responsibilities. ## Frequently asked questions ### Can I compare offers by the square-metre rate alone? Only after the measurement and included work are aligned. Otherwise a lower rate may simply omit preparation, details or services included elsewhere. ### Should an allowance for hidden damage be treated as a fixed price? No. Ask what triggers the allowance, how the condition will be assessed and how any additional work will be documented and approved. ### What should I send before requesting a roof quote? Share the location, approximate roof area, photographs taken safely, known leaks, previous work and equipment information. A contractor still needs to assess the actual roof before confirming a suitable scope. ## Sources and further reading - [Sika GCC: Sikalastic-525 RoofPro GCC system information](https://gcc.sika.com/en/construction/roofing/liquid-applied-membrane/sikalastic-525-roofprogcc.html): Supports the narrow example of substrate priming within a specified system. No product consumption, local price or universal installation instruction is reproduced. [Journal](https://bunyady.com/blog/) · [Request a quote](https://bunyady.com/#requestaquote) [English](https://bunyady.com/blog/roof-waterproofing-quotes-al-ahsa/) | [العربية](https://bunyady.com/ar/blog/roof-waterproofing-quotes-al-ahsa/)