Why 30-50% Budget Overruns Trace Back to a Missing BOQ (and How to Ask for One)

If you have started researching an interior architecture project in Lebanon or the GCC, you have almost certainly seen the term BOQ. It is one of the most important documents in the entire process, and one of the least explained. This guide covers exactly what a BOQ is, why it exists, what it should contain, and why its absence is the single biggest predictor of a renovation going over budget.

BOQ Stands for Bill of Quantities

A Bill of Quantities itemises every material, finish, fixture and labour cost in precise detail, delivering full financial transparency and eliminating budget surprises. Instead of a single lump-sum number, a BOQ breaks a project into individual line items: a named marble, a specific tile brand and grade, a quantity in square metres, a unit price, and a labour cost for installing it. Add every line item together and you get a total that is fully explained, not a total you are asked to trust.

Why a BOQ Exists: It Protects the Budget, Not Just the Designer

A BOQ is often described as a technical or administrative document, but its real function is financial protection. Once a BOQ is agreed, it becomes the reference point against which every contractor invoice, every material delivery, and every proposed substitution is checked. Any deviation is immediately auditable, and any substitution requires written client approval before it proceeds. Without that reference point, a contractor has no contractually enforceable specification to work against, and specification drift, quietly swapping a specified material or finish for a cheaper one, becomes very difficult to catch until the work is already built.

The Numbers: What Happens With and Without a BOQ

Across completed projects in Lebanon and the GCC, the pattern is consistent and significant. Projects without a detailed BOQ average cost overruns of 30 to 50%. Projects with a complete, itemised BOQ agreed before contractor engagement average under 8% variance from budget. That is not a marginal difference: it is the difference between a project that lands close to its planned cost and one that can grow by half again before completion.

What a Proper BOQ Should Include

A BOQ that actually protects a client's budget needs to go beyond a rough materials list. At minimum, it should include: every material named by brand and grade, not a generic category; quantities cross-checked against the approved design drawings, not estimated by eye; labour costed separately from materials, so the two can each be audited independently; unit prices, so a change in quantity can be recalculated transparently rather than renegotiated from scratch; and procurement and logistics costs, including import duties and lead times, itemised rather than buried inside a materials markup.

If any of these elements is missing, the document is a materials estimate, not a BOQ, and it will not protect you the way a real BOQ does.

When Should the BOQ Be Prepared?

The BOQ belongs at the end of the design phase and before the start of construction, once the concept, spatial layout and material selections are finalised, but before a single contractor is engaged to build anything. Preparing it any later, after construction has already started, defeats its purpose: by then, some decisions have already been made informally, on-site, without the price transparency and accountability a BOQ is meant to provide.

Who Should Prepare It

The interior architect or designer prepares the BOQ as part of the design process, working from finalised drawings and material selections, before any contractor is engaged. This matters: a BOQ prepared by the same contractor who will later be paid according to it carries an obvious conflict of interest. An independent BOQ, prepared by your designer on your behalf, is what gives the document its credibility as a genuine budget-protection tool rather than a sales estimate. At Dory Youness Interior Architecture and Design, a complete BOQ is a non-negotiable deliverable before any contractor is engaged on any project, without exception.

BOQs for Remote and Diaspora Clients

A rigorous BOQ matters even more when a client cannot visit the site regularly. For Lebanese diaspora clients managing a project from abroad, the BOQ, combined with a Digital Twin visualisation and structured milestone reporting, is what makes remote approval possible without ambiguity: every material has a name, a grade and a price, so a decision can be confirmed by message or video call with the same confidence as an in-person site visit.

A Simple Way to Test Any Quote You Receive

Before signing with any interior architect or contractor, ask a single question: what happens if the contractor deviates from what was agreed, and who has to approve it in writing? If the answer is vague, or if there is no BOQ to deviate from in the first place, that is the moment to pause. A properly prepared BOQ is not paperwork. It is the single document most likely to determine whether your project finishes on budget.

Frequently Asked Questions