How can I reduce construction cost without losing essential requirements?
Test alternatives against what the project must achieve. A cheaper purchase can be poor value if it creates redesign, delay or higher operating costs.
by Jack Butler-Kettle · About 5 min readShare
Before you start
Gather the brief, current design, cost plan, programme and outstanding commitments. Identify essential requirements and who can approve design changes.
Value engineering examines how to deliver the required function more effectively. It should not mean removing necessary performance or concealing an unaffordable scope.
The RICS value management and value engineering guidance distinguishes value from a simple reduction in initial cost. The project team still needs to assess each proposed change.
Step-by-step guide
1. Agree the requirements that must be preserved
List safety, statutory, performance, capacity, accessibility and operational requirements with the design team. Distinguish them from preferences that can be reconsidered.
Rank the client’s objectives, such as appearance, maintenance, flexibility or speed. Record who may approve a trade-off.
A cost consultant can assess financial effects; technical adequacy belongs with the responsible designer or specialist.
2. Develop specific alternatives
Target high-cost elements and unnecessary complexity. Consider simpler layouts, standard sizes, different procurement or equivalent materials, subject to design review.
Describe each option precisely enough to price. Omitting an unexplained percentage from every trade does not create a deliverable saving.
Record what remains unchanged so bidders can compare the same performance and scope.
3. Calculate the net cost effect
Compare the replacement scope with the original allowance on the same tax and pricing basis. Include redesign, abortive work, cancellation and programme effects.
Check whether lower purchase cost introduces higher maintenance, replacement or energy costs. State the period and assumptions used for any whole-life comparison.
Separate evidenced quotations from provisional assumptions and identify remaining risks.
4. Check acceptability before approval
Ask the design team to assess compliance, coordination, warranty and performance. Consult affected operators or occupiers where appropriate.
Resolve supplier lead times and programme consequences. A technically acceptable option can still be unsuitable if it misses the project’s required date.
Record approval, conditions and who is responsible for updating the design and contract documents.
5. Update the scope and verify the saving
Replace the original allowance with the approved option. Track the actual procurement outcome and avoid claiming the same saving twice.
If commitments already exceed the budget, use the over-budget checks to distinguish recoverable decisions from costs already incurred.
Our Construction cost estimating and planning service records the scope, assumptions and allowances behind a client’s construction budget.
Before you finish: Confirm technical acceptance and the full net saving before approving a change. Update the budget, documents and risk register together.
Worked example
The facts
A fictional alternative reduces a package quotation from £50,000 to £42,000. It requires £2,000 of redesign and £1,000 of cancellation cost.
What happens
The headline reduction is £8,000.
The net initial saving is £8,000 − £2,000 − £1,000 = £5,000.
The team checks performance, maintenance and timing before approval, then replaces the original allowance.
What this shows
The £5,000 is an explained initial saving. It is not proof of better whole-life value until the other effects are assessed.
Value engineering appraisal
Evaluate equivalent performance and whole-project effects. Do not count a saving until the change and its consequential costs are understood.
Free blank template for your own project. The completed example is shown below. No email address required.
View the completed example
Completed fictional example
Westhaven refurbishment · 14 October 2026 · Version 1.0
Value engineering appraisal
Scroll across if needed to read the whole record. A dash means no value has been entered.
| Option | Baseline cost (£) | Alternative cost (£) | Consequential cost (£) | Net saving (£) | Performance / programme | Decision |
|---|---|---|---|---|---|---|
| Alternative ceiling system | £18,000.00 | £15,000.00 | £1,000.00 | £2,000.00 | Same fire/acoustic rating subject to design approval; no time change | Proposed; designer review required |
| Standard door sizes | £12,000.00 | £10,500.00 | £500.00 | £1,000.00 | Layout adjustment required; lead time reduces one week | Client to approve revised layout |
The examples show £2,000 and £1,000 forecast savings before VAT. Include maintenance, warranty and performance consequences in the decision.
Risk and contingency register
Record risk owners and evidence for each transfer. Reconcile the revised base budget and remaining contingency to the approved total.
Free blank template for your own project. The completed example is shown below. No email address required.
View the completed example
Completed fictional example
Westhaven refurbishment · 14 October 2026 · Version 1.0
Risk register
Scroll across if needed to read the whole record. A dash means no value has been entered.
| Risk | Cause / effect | Allowance (£) | Owner | Mitigation / status |
|---|---|---|---|---|
| R-01 ground conditions | Unknown local obstruction; additional excavation | £12,000.00 | Project lead | Trial pits before main works |
| R-02 design development | Unresolved service routes | £18,000.00 | Design lead | Coordinate before procurement |
Contingency control
Scroll across if needed to read the whole record. A dash means no value has been entered.
| Budget | Original base (£) | Original contingency (£) | Approved transfer (£) | Revised base (£) | Remaining contingency (£) | Total (£) |
|---|---|---|---|---|---|---|
| Approved project budget | £300,000.00 | £30,000.00 | £8,000.00 | £308,000.00 | £22,000.00 | £330,000.00 |
The £8,000 transfer reallocates the existing budget: £308,000 base plus £22,000 contingency still totals £330,000. It is not an extra saving or a new budget.