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When planning a renovation or extension, costs pile up quickly. It is natural to look for savings. When receiving three quotes for structural engineering and one is significantly cheaper than the others, it feels like an easy win.

But in construction, the design fee is just the tip of the iceberg. A “cheap” design can often lead to an expensive build. Here is why the lowest engineering quote often ends up being the most expensive option in the long run.

1. The Cost of Over-Design

Time is money. A cheaper engineer may have to work faster to make a profit. The quickest way to design a beam is not to calculate it precisely, but to “over-engineer” it—picking a massive steel section that will definitely work, without doing the fine-tuning to see if a lighter one would suffice.

• The Scenario: Engineer A (Cheap) specifies a heavy 50kg/m steel beam due to time constraints. Engineer B (Thorough) spends an extra hour calculating and specifies a 30kg/m beam.
• The Result: A small saving on fees often leads to higher steel costs during the build.

2. Construction “Extras”

A low fee usually means a limited drawing package. If the drawings are vague or lack detail, the builder is left to fill in the blanks.

• Pricing Risk: When builders see vague drawings, they often add a “risk allowance” to their price to cover unknowns.
• On-Site Delays: If a detail isn’t clear, work stops.

3. Efficient Engineering

A good structural engineer doesn’t just make the building stand up; they look for the most efficient way to build it. Engineers often call this “Value Engineering” or efficient design. This might involve:

• Designing foundations that require less digging and less concrete.
• Positioning columns to hide them in walls, saving money on boxing them in.
• Using timber instead of steel where possible (which is cheaper and easier to handle).

Clients pay for the engineer’s thinking time. Paying for the bare minimum often results in a bare minimum solution—safe, but rarely cost-effective.

4. The “Ghost” Engineer

Renovations rarely go 100% to plan. When a builder uncovers a drain that wasn’t on the map or a rot-infested joist, an engineer who can react quickly is essential. Budget firms often operate on a “high volume, low service” model, making it difficult to get them back on site to solve a crisis.

Industry Advice: Don’t just look at the bottom line of the quote. Ask: Does this include site visits? How detailed are the plans? Will the engineer look for cost-saving options in the steelwork? Invest in the design to save on the build.