Bridge Engineering
Mahaweli River Bridge
Kandy District Completed 2022
LKR 3.8B
Established 1989 · Sri Lanka
Building
National Infrastructure
Engineering the future of Sri Lanka's roads, bridges, and critical utilities — delivering projects of national scale since 1989.
0 Years of Excellence
0 Major Projects
0 Billion LKR Delivered
0 Active Sites
Who We Are
A Heavyweight in
Civil Construction
Founded in 1989, Cornerstone Group has grown from a regional road contractor to one of Sri Lanka's most trusted large-scale civil and infrastructure firms. We deliver for the government, for enterprise, and for the future.
- ISO 9001:2015 Quality Management certified
- ISO 14001:2015 Environmental Management certified
- OHSAS 18001 Occupational Health & Safety certified
- Member, Sri Lanka Institute of Construction Technology
Southern Expressway Extension
Matara–Hambantota · 2021–2023
Our Work
Landmark Projects
Road & Highway
A1 Expressway Widening
Colombo–Kandy Completed 2021
LKR 6.2B 
Civil Construction
Hambantota Port Access
Hambantota Completed 2020
LKR 2.1B 
Water & Utilities
Kelani Valley Water Scheme
Western Province Completed 2023
LKR 4.5B 
Utilities
Colombo Port City Utilities
Colombo Completed 2023
LKR 1.9B 
Road & Highway
Northern Highway Phase III
Northern Province Completed 2024
LKR 8.4B
What We Do
Core Service Areas
From initial site investigation to final handover — we deliver end-to-end civil construction and infrastructure services.
Civil Construction
Large-scale earthworks, foundations, structural concrete, and site formation for roads, interchanges, bridges, and public infrastructure.
Learn MoreProject Management
Full project lifecycle management — from feasibility studies and tender preparation to construction supervision and commissioning.
Learn MoreSpecialist Subcontracting
Specialist civil works including deep excavation, piling, geotechnical works, and utilities installation for principal contractors and government agencies.
Learn More
87% On-time delivery rate
Why Choose Us
Scale. Safety.
Certainty.
National-Scale Capability
We have the plant, personnel, and systems to execute projects valued at over LKR 10 billion simultaneously.
Zero-Compromise Safety
Our safety record is our most prized asset. Every project operates under our proprietary SafeFirst management framework.
Proven Government Track Record
Preferred contractor for RDA, NWS&DB, MMDE, and major multilateral-funded programmes.
Standards & Certifications
Certified.
Accredited.
All certifications independently audited and renewed annually by internationally recognised certification bodies.
ISO 9001:2015
Quality Management
End-to-end quality management system covering all civil and infrastructure delivery.
ISO 14001:2015
Environmental Management
Environmental impact and ecological mitigation across all active project sites.
ISO 45001:2018
Occupational Health & Safety
Occupational safety management governing 14 active sites and all subcontractor obligations.
CIDA Grade C1
All Works — Unlimited Value
Highest CIDA classification. Authorises unlimited contract value for government procurement.
NCASL
Corporate Member
Full corporate membership conferring eligibility for national procurement frameworks.
SafeFirst Gold
Zero LTI — 24 Month Record
Gold award for zero Lost Time Incidents across all sites over 24 consecutive months.
Ready to Build?
Let's Discuss
Your Project
From preliminary feasibility to final commissioning — our team is ready to support your most ambitious infrastructure undertaking.