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A residential renovation and extension project where the payment paperwork drifted away from the contract

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Project Type: Renovation, extension and external works

Location: South Dublin

Contract Form: RIAI Building Contract (2020 Edition)

Contract Value: Approximately €600,000

Payment Cycle: Four-weekly interim valuations

Role: Quantity Surveyor – Payment Assessment, Account Reconciliation and Final Account Review

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The Project

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This residential project involved the demolition of existing structures, extensive renovation works to the original house, a new extension, and significant external works.

The contractor was engaged under a fixed-price RIAI building contract, with interim valuations being submitted every four weeks and certified by the design team throughout the construction period.

The quality of workmanship on site was good. The contractor was performing well, the homeowners were paying regularly, and the project progressed substantially in accordance with the programme.

Yet by the latter stages of the project, a significant financial discrepancy had emerged.

No one could immediately identify where it had come from.

The Problem

When I was asked to review the account, it became clear that the issue was not the work itself.

The issue was the paperwork.

Over a number of interim valuations, three small departures from the contract administration process had gradually compounded.

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1. Invoices Were Not Following the Contract Calculation Method

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The contractor's invoices were being prepared differently from the certified valuations.

The difference centred on the sequence in which retention and VAT were applied.

Although the discrepancy appeared minor on each individual valuation, it created cumulative differences between certified amounts and invoiced amounts throughout the project.

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2. Valuations Were No Longer Referencing the Bill of Quantities

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Applications for payment were increasingly being submitted as percentage summaries rather than line-by-line assessments against the original bill.

Descriptions such as:

"Roof Works – 80% Complete"

or

"External Works – 75% Complete"

provided insufficient information to verify the actual value of completed work.

The further a project moves away from measured bill items, the harder it becomes to assess whether valuations accurately reflect progress on site.

3. Payments Had Drifted Away From Certificates

The homeowners had made payments regularly and in good faith throughout the project.

However, some payments had been made as agreed transfer amounts rather than directly against specific certificates.

As the project progressed, the relationship between:

• Claimed amounts

• Certified amounts

• Actual payments

became increasingly difficult to track.

No individual payment was particularly problematic.

Collectively, however, the account had lost its audit trail.

The Review

The solution was not complicated.

It simply required discipline and transparency.

A full reconciliation exercise was undertaken covering every valuation submitted during the project.

Each valuation was reviewed against:

• The certified amount

• The amount invoiced

• The amount paid

• The cumulative account position

The contractor was requested to resubmit valuations in a format that could be properly verified against the contract documentation.

To their credit, they cooperated fully throughout the process.

Once the valuations were presented in a consistent format, the position became clear.

The project account had drifted significantly from the certified position, despite all parties believing that payments were broadly up to date.

The Key Finding

The review identified that a substantial certified balance remained unpaid.

Importantly, the amount had not arisen because of a dispute.

It had not arisen because of defective work.

It had not arisen because any party was acting improperly.

Instead, it was the result of a gradual disconnect between valuations, certificates and payments over a number of months.

Once the account was reconciled in a single document, the outstanding position became immediately visible.

What had appeared to be a complex disagreement was, in reality, an accounting and administration issue.

The Outcome

The account was brought back into alignment.

The outstanding certified balance was identified and documented.

Future valuations were submitted in a format that could be properly assessed against the bill of quantities.

The contractor received clarity regarding certified entitlements.

The homeowners received clarity regarding payments already made.

Most importantly, the project regained a single, transparent financial record.

The final account process then proceeded on a much firmer footing.

In many ways, the exercise reinforced a lesson experienced quantity surveyors learn repeatedly:

The real final account is often substantially established before the final account meeting ever takes place.

If interim valuations, certifications and payments are properly managed throughout the project, the final account becomes a confirmation exercise rather than a dispute.

Lessons for Homeowners

Always Pay Against Certificates

Every payment should be linked to a specific certificate number.

This creates a clear audit trail and avoids confusion later in the project.

Insist on Measurable Valuations

Percentage summaries are difficult to verify.

Valuations should be capable of being checked against the original bill or contract breakdown.

Reconcile Regularly

A simple reconciliation showing:

• Claimed

• Certified

• Paid

• Outstanding

can prevent small discrepancies becoming major problems.

Don't Wait Until The End

The earlier an account is reviewed, the easier it is to resolve.

A discrepancy identified during the third valuation is usually straightforward.

The same discrepancy discovered at final account stage can become significantly more difficult.

Conclusion

This project was not a dispute story.

It was an administration story.

Good contractor.

Good clients.

Good project.

But even on well-run projects, small departures from the contract process can accumulate over time.

The lesson is simple:

When payment applications, certificates and actual payments all tell the same story, projects finish smoothly.

When they stop telling the same story, reconciliation becomes one of the most valuable services a quantity surveyor can provide.

Project details have been anonymised and financial figures rounded to preserve confidentiality.

This version is more timeless, more legally robust, and more likely to rank for searches around RIAI contracts, interim valuations, payment certificates, final accounts, construction payment disputes, and residential quantity surveying in Ireland. It also positions you as the professional who restores clarity rather than the person chasing a specific €33,000

discrepancy.