Jasa Konstruksi: Guide to Control Costs and Progress

What is construction project cost control software?

Construction project cost control software links your tender BoQ, budget, purchases, site costs and progress claims in one place. It shows budget against actual cost for every work item as the job runs. Singapore contractors use it to protect margin and to back each payment claim under the SOP Act with clear records.

Think of it as the dashboard in a car. The fuel gauge, speed and warning lights sit in one view. You see a problem before the engine stops. Cost control software does the same for a project budget.

This guide is for contractors, quantity surveyors and project finance teams in Singapore. It covers the following topics.

• Why construction costs drift and where they leak.
• The features to look for in cost control software.
• The workflow from tender BoQ to progress claim.
• The SOP Act and GST rules for progress payments and retention.
• A worked S$ progress claim and a checklist with red flags.

Why construction project costs drift

Few projects go over budget in one big step. Costs drift through many small gaps. Each one looks minor until the final account.

• The BoQ, budget and purchase records sit in separate files.
• Site teams order materials without checking the remaining budget.
• Variations are agreed on site but priced weeks later.
• Subcontractor claims are paid without a measured quantity.
• Progress claims to the client lag behind the work done.

A main contractor building a Tampines factory shows the pattern. Its tender BoQ priced rebar at S$1,150 per tonne. Site orders went out at S$1,260 without a budget check. By month four, rebar alone was S$38,000 over budget.

The fix is a single baseline. Every purchase, timesheet and claim should point back to a BoQ item. Our guide to cost control in construction covers more strategies to avoid overruns.

Features to look for in cost control software

Not every project tool controls cost. Many track tasks but not money. Use the table below to test each option.

The BoQ is like a recipe card for the whole building. It lists every item, quantity and rate. If the recipe card changes without notice, nobody can tell why the cake cost more. Read our guide to the bill of quantities for more on BoQ structure.

Spreadsheet or cost control software?

Many contractors start with spreadsheets, and that is fine for small jobs. The trouble starts with several projects, many variations and monthly claims. Use this decision table to choose.

Your situation	Spreadsheet	Cost control software
One small project with a few trades	Usually enough	Optional
Several projects running at once	Versions clash and totals drift	Recommended
Frequent variations	Hard to track against the BoQ	Recommended
Monthly progress claims	Claims rebuilt by hand each time	Recommended
Many subcontractors	Claims checked one by one	Recommended

A spreadsheet is like a paper logbook on a big site. It works until three people need it at once. After that, nobody is sure which copy is right.

Consider a Sengkang builder running four HDB upgrading jobs. Each project manager kept a separate cost sheet. Head office spent two days each month just merging them. One shared system removed that step.

The workflow from tender BoQ to progress claim

Good cost control follows the money from tender to final account. Each step hands its data to the next. Here is a typical sequence for a main contractor.

1. Price the tender BoQ, often from a template.
2. Register the awarded contract with its value, advance payment and retention terms.
3. Build the internal cost budget from the BoQ.
4. Issue job orders to your own crews or to subcontractors.
5. Raise site material requests against BoQ items.
6. Record actual materials, labour and equipment used.
7. Measure progress per BoQ item for the period.
8. Prepare the progress claim from the measured quantities.
9. Review budget against actual and update the forecast.

Steps seven and eight are where cash comes in. A claim built from measured quantities is easier for the client to certify. It also stands up better if a dispute goes to adjudication.

Consider a Jurong M&E subcontractor fitting out a data centre. It measures cable tray installed each month per floor. The claim lists each floor's measured quantity against the BoQ rate. The main contractor certifies it within days, not weeks.

The SOP Act and progress payments in Singapore

The Building and Construction Industry Security of Payment Act, or SOP Act, took effect on 1 April 2005. It gives anyone who carries out construction work or supplies goods under a written contract the right to progress payment. It also provides a fast, low-cost adjudication process for payment disputes.

The process runs like a structured conversation. The claimant serves a payment claim within the period set in the contract. The respondent replies with a payment response. If the claimant disagrees with the response or is not paid, it can apply for adjudication.

The Act is short on paper but strict in practice. Here are the main points contractors should know.

• The payment response is due by the contract date, and no later than 21 days after the claim is served.
• Pay-when-paid clauses are unenforceable under the Act.
• Adjudication applications go to the Singapore Mediation Centre, the authorised nominating body.
• Amendments to the Act took effect on 15 December 2019.

Good records decide most adjudications. An adjudicator looks at what was claimed, measured and agreed. Cost control software that ties each claim to measured BoQ quantities makes that evidence easy to produce. See BCA's guidance and the Act itself for the full rules.

GST on progress claims and retention

GST in Singapore is 9 %. A GST-registered contractor charges GST on progress payments. IRAS sets out when GST is due on construction work.

For progress payments, you account for GST at the earlier of two dates. One is when you receive payment. The other is when you issue an invoice. The same rule applies to retention sums when they are released or invoiced.

IRAS also notes that a letter of claim is not the same as a tax invoice. Many main contractors send a letter of claim to the developer first. Make sure your process issues the tax invoice at the right time. Check the IRAS construction guide for details.

A Kaki Bukit renovation contractor learned this the hard way. It issued tax invoices with every letter of claim. When clients cut the claimed amounts, it had to issue credit notes. Waiting for certification would have saved that work.

Worked S$ progress claim with retention

Here is an illustrative case. A main contractor builds a S$5,000,000 warehouse in Tuas. The contract includes a 10 % advance payment and 5 % retention on each claim. All figures are before GST.

Now look at the cost side. The internal budget for the work done to date is S$1,700,000. Actual cost to date is S$1,820,000. The project is S$120,000 over budget for the work done.

The cost performance index, or CPI, compares budget with actual. Here it is S$1,700,000 ÷ S$1,820,000, or about 0.93. Each dollar spent earns about 93 cents of planned value. If this rate holds, the margin will shrink by the end of the job.

Software that shows these numbers each month gives you time to act. You can renegotiate supplier rates, check site waste or price a variation. A spreadsheet reviewed only at month end often finds the gap too late.

KPIs to monitor on every project

A few numbers tell you most of what you need. Review them monthly for each project. Compare them across projects to spot weak teams or trades.

KPI	Formula	What it tells you
Cost variance	Budgeted cost of work done − actual cost	Money over or under budget
Cost performance index	Budgeted cost of work done ÷ actual cost	Value earned per dollar spent
Progress against plan	Actual progress % ÷ planned progress %	Whether the job is on schedule
Claim lag	Days from period end to claim submission	How fast you bill for work done
Retention held	Total retention withheld to date	Cash tied up until release

Retention is like a deposit on a rental flat. The client holds it until the defects period ends. Track it closely, because it can add up to a large sum across projects.

Software checklist with red flags

Use this checklist during a vendor demo. Each row lists a good answer and a red flag. Ask the vendor to show each one with your own data.

Check	Good answer	Red flag
BoQ link	Every cost and claim points to a BoQ item	Costs sit in a general project bucket
Budget changes	Approved change requests with history	Budgets can be edited without a trace
Site requests	Material requests show the remaining budget	Site orders go straight to suppliers
Progress evidence	Measured quantities per item and period	Progress entered as a guessed percentage
Claim build	Claims show previous claims, advance recovery and retention	Claims typed up in a separate spreadsheet
Subcontractor claims	Subcontractor claims are checked against measured work	Subcontractor invoices paid on request
Reporting	S-curve and budget against actual on demand	Reports built by hand each month

Take the progress evidence row seriously. A guessed percentage is hard to defend under the SOP Act. Our guide to construction progress tracking explains how to measure progress well.

How HashMicro supports construction cost control

HashMicro's construction software runs contractor projects from BoQ to progress claim. BoQs are versioned and can start from templates. Contracts with the client link to the BoQ and carry the value, advance payment and retention terms. A cost sheet holds the internal budget per BoQ item, with revenue and margin.

Execution tools cover the site side. Job orders go to your own crews or to subcontractors. Resource actualisation records actual materials, labour and equipment against the budget. Site material requests can be raised against a BoQ item, and budget change requests need approval.

Progress and billing follow from the site records. Quantity surveys measure progress per BoQ item for each period. Progressive claims are built from approved surveys, showing gross value, advance deduction, retention and the net claim. Subcontractor claims can create the vendor bill.

Reports include the S-curve, Gantt chart, Cost Sheet Resource Analysis and Progressive Claim Analysis. A risk register and issue log sit alongside them. Note that the module is built for contractors. Project owners can track budgets and pay contractor bills, but owner-side certification needs its own process.

See it with one of your own projects. Book a demo and bring a real BoQ and last month's claim. Ask the team to rebuild the claim from measured quantities.

Frequently asked questions

What does construction project cost control software do?

It links the BoQ, budget, purchases, site costs and progress claims. It shows budget against actual cost for each work item. This helps you protect margin and bill on time.

How does the SOP Act affect progress claims?

It gives you a right to progress payment for work done under a written contract. The respondent must reply with a payment response within set time limits. Disputes can go to fast adjudication.

When is GST due on a progress payment in Singapore?

GST is due at the earlier of payment received or invoice issued. The same rule applies to retention sums. A letter of claim on its own is not a tax invoice.

What is retention in a construction contract?

Retention is a part of each payment that the client holds back. It is released after the work is complete and defects are fixed. The rate and release terms are set in the contract.

Can a spreadsheet replace cost control software?

For one small job, a spreadsheet may be enough. With several projects, versions and claims, errors grow fast. Software keeps one baseline and a clear audit trail.

For related reading, see our guides to progress billing and variation orders. Both explain parts of the claim cycle in more depth.

Sources

• BCA, Security of Payment Act
• IRAS, Current GST rates
• IRAS, GST guide for the construction sector
• Singapore Mediation Centre, Adjudication