NEC4 Tools for Engineers, by an Engineer

Free tools for NEC4 Compensation Events, Working Days, and Clause Reference. Built by a practising NEC4 professional for the global engineering community.

Contract Profile

Hong Kong Edition · Option A

Calendar Days Calculator

Calculate calendar days between dates, or add days from a start date. Ref: NEC4 Clause X60.1

Start Date

End Date

Include end date in calculation

⚠️ Result is for reference only. Actual CE periods should be determined per contract terms and professional advice.

Working Days Calculator

Business days between two dates, including or excluding weekends and public holidays. Ref: NEC4 Clause X60.1

Start Date

End Date

Include end date in calculation (+1 day)

Holidays for

What to exclude

Custom Holidays (optional)

⚠️ Result is for reference only. Actual CE periods should be determined per contract terms and professional advice.

CE Cost Calculator

Build a CE quotation including direct costs, prolongation (EOT), overhead, and fee. Option A/B uses rates; Option C/D uses Defined Cost + Fee.

Project Name

Contractor

Contract Profile

Hong Kong Edition · Option A

Direct Cost Items

Prolongation Cost (EOT)

Delay (working days)

Daily Site Overhead

Daily Plant & Equipment

Overhead (%)

Fee (%)

⚠️ For Option A/B: use rates from Activity Schedule/BoQ. For Option C/D: use Defined Cost + Fee. Prolongation applies when a CE extends the planned Completion Date.

Programme Delay Analyzer

Track and analyse programme delays against the planned programme. Identifies critical path impact, float consumption, and total project delay. Ref: NEC4 ECC clause 63.3

Project Name

Duration Unit:

Delay Activities

Activity Name	Planned Start	Planned End	Actual Start	Actual End	Status	Planned Dur.	Actual Dur.	Delay
						—	—	—

Float Consumption

Total Float Available (calendar days)

⚠️ Result is for reference only. Actual delay analysis should be determined per contract terms and professional programming advice. Float consumption assumes non-critical activities consume float before impacting the critical path.

Early Warning Generator

NEC4 Clause 16.1 — Fill in the details below and the system will draft a professional Early Warning notice in Word format.

Project Information

Project Name

Contract Reference

From (Your Name / Company)

To (Project Manager)

Contractor Company

Date of Warning

The Matter / Issue

📍 Location (where in the works)

📋 Description of the Matter

📊 Background / Expected Conditions

📈 Potential Impact

CostCompletion DateQualityOther

✅ Actions & Mitigation

Actions Taken / Proposed Mitigation

🔍 Ongoing Monitoring Required

📎 Attachments

⚠️ Ref: NEC4 Clause 16.1 — The Contractor and Project Manager notify the other Party as soon as either becomes aware of any matter that could affect the Price, Completion Date, or Quality of the Works. This tool helps draft the notification; always review before submission.

CE Notification Draft (Clause 61.3)

Draft a professional Compensation Event notification letter under NEC4 Clause 61.3.

Project Name

Contract Reference

Contractor

Project Manager

📍 Location

CE Clause (e.g. 60.1(2))

📋 Description of the Matter

📈 Expected Impact

✅ Actions Taken / Proposed

CE Quotation Draft

Draft a professional Compensation Event quotation with cost breakdown and fee calculation.

Project Name

Contract Reference

Contractor

Project Manager

📍 Location

CE Clause (e.g. 60.1(2))

📋 Description of Event

⏱ Impact on Time

💰 Estimated Cost Impact

✅ Mitigation Measures

Now Available

NEC4 Clause Search

Full clause reference with commentary

CE Cost Calculator

Option-aware cost assessment

Delay Analyzer

Programme impact analysis tool

CE Notification

AI-drafted Clause 61.3 letter

CE Quotation

AI-drafted cost quotation

Resources

NEC4 checklists, templates & guides

Blog & Guides

NEC4 articles and practical guides

AI Chat

NEC4 AI consultant (free)

NEC4 Hangman

Learn clauses through play