When to bring a QS into your project?

(Hint: It’s earlier than you think).

Most people hire a Quantity Surveyor at the wrong time.

They bring us in once something has gone wrong, and the dispute is already raging.

The problem is that by then we’re in full damage limitation mode.

The Right Time: Before you have anything to price.

The ideal moment to bring in a QS is at feasibility stage -- before you've appointed an architect, or at the very least before they start designing in detail.

At feasibility, a QS can tell you:

• What your site can realistically support within your budget.

• Which building typology gives you the best value per square metre for your intended use.

• What the ballpark construction cost will be for the scheme you're thinking about.

• Where the cost risks sit, so the design team can work around them from day one.

• Areas where you can save money or may need to allow more in your budget.

This is often dismissed as "too early to price anything." That's true in a literal sense -- you can't produce a bill of quantities for a scheme that doesn't exist yet. But you can produce a robust feasibility estimate using benchmark data from similar projects, and that estimate is the single most valuable piece of information you'll get in the entire project.

The Key Decision Points

If you can't involve a QS continuously, make sure you bring one in at these four moments:

1. Feasibility (RIBA Stage 0-1). Before committing to a site or a scheme, get a cost benchmark. This tells you whether the project is viable and sets the budget the design team has to work to.

2. Concept Design (RIBA Stage 2). Once the architect has sketched options, a cost plan compares them and flags which design moves drive cost. This is where you catch the "expensive feature" problems before they become load-bearing.

3. Developed Design (RIBA Stage 3-4). As the design firms up, the cost plan gets tightened. Specifications are reviewed, value engineering opportunities are identified, and the pre-tender estimate is produced.

4. Tender (RIBA Stage 4-5). The QS prepares tender documentation, analyses returns, flags unrealistic pricing, and recommends a contractor. Skipping this and picking the lowest bid on price alone is how projects end up in dispute.

After tender, a QS should stay involved through construction for valuations, change management, and final account -- but the battle for cost control is largely won or lost before a spade goes in the ground.

"But We're Only a Small Project"

This thinking applies just as much to a £80,000 loft conversion as to a £8m commercial development. The numbers are smaller but the ratios are the same. A homeowner who spends £500 on a feasibility estimate before briefing an architect will often save thousands in redesign fees and tens of thousands in build cost. The same logic scales.

For small residential projects, "bringing in a QS early" might just mean a half-day consultation to pressure-test your budget and flag the risks. For a major commercial scheme, it means appointing a cost consultant from inception. Either way, the principle holds: the earlier the involvement, the greater the influence on cost.

What changes when you get the timing right?

Projects that start with cost advice embedded in the design process tend to share a few characteristics. The final account lands close to the original budget. Disputes are rare because everyone understood the cost position from the start. Value engineering happens in the drawing office, not on site. The client doesn't spend the project fighting fires.

Projects that bring in cost advice late, tend to have the opposite experience. Scope creeps, budget overruns, heated meetings about variations, and a final account negotiation that drags on for months.

The Bottom Line

If you're thinking about a construction project -- any construction project -- the question isn't whether you need a QS. It's how early you can get one involved. The cost of early QS advice is a rounding error against the cost of building something you can't afford.

Waiting until you need prices is like asking your accountant to do your tax return after you've already made the decisions. The value of professional advice is in shaping what you're about to do, not just reporting on what you've already done.

If you're in the early stages of a project and want an honest view on whether the numbers stack up, drop me a message. A conversation at the right time is worth more than a full service at the wrong one.