Service
A&A Contractor Singapore (Addition & Alteration Specialists)
What Are A&A Works? (Simple Explanation)
A&A (Addition & Alteration) works refer to upgrading or modifying the existing structure without demolishing the entire house. This is different from reconstruction or rebuild, where the majority of the structure is torn down.
Common examples of A&A include:
Adding a room or expanding your floor area
Rear extension of the house
Adding an attic or loft
Changing roof structure
Strengthening beams and columns
Upgrading toilets, kitchen, flooring
Reconfiguring internal walls and spaces
Extending car porch
Adding second living room or family area
Changing façade design
Upgrading M&E (electrical, plumbing, aircon)
These works enhance the house without removing more than 50% of the existing structure — a BCA rule that differentiates A&A from full reconstruction.
Download Brochure
A&A vs Renovation vs Reconstruction, What’s the Difference?
Understanding the differences helps you decide the most suitable option.
Renovation
Minor works
Does NOT involve structural changes or extensions.
Examples:
Painting
Carpentry
Tiling
Non-load-bearing wall changes
A&A (Addition & Alteration)
Medium to major works
Involves structural and layout changes but keeps majority of the building intact.
Examples:
Floor expansions
Attic creation
Car porch extension
Replacing roof
Altering structural components
Reconstruction / Rebuild
Major works
More than 50% of the building is removed.
Requires full BCA & URA control.
Use this if your house is structurally old or you want a totally new design.
Which Should You Choose?
Choose A&A if:
✔ Your house structure is still stable
✔ You want to expand GFA without demolishing
✔ You want a faster and more affordable upgrade
✔ You want to modernise specific parts of the home
Why A&A Works Are Popular Among Landed Homeowners
Singaporean landed homeowners often choose A&A because:
1. Faster than a full rebuild - Most A&A projects complete in 6–12 months.
2. More affordable - A&A costs range from $150,000 – $600,000, depending on scope.
3. No need for major demolition - Less noise, fewer approvals, fewer neighbour issues.
4. Significantly improves property value - Modern layouts and extended spaces increase resale value.
5. Ideal for older homes needing upgrades - Especially for terrace houses and semi-Ds built 20–30 years ago.
Our A&A Services (Full Scope)
As a specialist A&A contractor in Singapore, we provide the full suite of A&A works.
Structural Works
Beam strengthening
Column reinforcement
Partial demolition
Roof extension or replacement
Second-storey extension
Loft or attic creation
Space Expansion
Rear extension
Kitchen expansion
Living room extension
Adding bedrooms or study rooms
Car porch extension
Side setbacks optimisation
Layout Reconfiguration
Changing internal walls
Open concept design
Walk-in wardrobes
Larger master bedroom
Exterior & Façade Upgrades
Modern façade cladding
Repainting
Window upgrades
Sliding glass doors
Balcony or terrace extensions
Interior Upgrading
Entire kitchen overhaul
Toilet revamp
Flooring
Lighting design
Built-in carpentry
Smart home installation
M&E (Mechanical & Electrical)
Plumbing upgrades
New aircon trunking
Electrical rewiring
Waterproofing
Solar panel preparation
Authority Submission & QP Services
We handle all approvals with:
BCA
URA
SCDF
LTA
PUB
NParks
So you don’t have to deal with the paperwork.
A&A Cost Guide (2026)
The cost of A&A works depends on the size of the property and the complexity of the changes.
Typical landed A&A cost range in Singapore:
Basic A&A
$150,000 – $280,000
Suitable for:
Light structural changes
Kitchen/toilet upgrades
Minor extensions
Moderate A&A
$280,000 – $450,000
Suitable for:
1st or 2nd-storey extensions
Roof upgrades
New rooms or expanded floor area
Major A&A
$450,000 – $650,000+
Suitable for:
Attic creation
New façade
Major internal reconfiguration
Heavy structural reinforcement
Cost Factors Include:
GFA increase
Roof height changes
Size of extension
Foundation condition
Quality of finishing
M&E changes
Soil condition
We provide transparent breakdowns with cost justifications before work begins.
A&A Timeline — From Start to Handover
A well-managed A&A project usually takes 6 to 12 months.
1. Design & Planning (1–2 months)
Site inspection
Floor plan review
Concept design
Budget planning
2. Authority Submissions (1–3 months)
Depending on complexity.
We handle all BCA, URA, and other authority approvals.
3. Construction Phase (4–8 months)
Partial demolition
Structural enhancement
M&E installation
Finishing works
4. Final Handover (2 weeks)
Quality inspection
Touch-ups
Clean-up
Owner walkthrough
Do You Need Approval for A&A Works?
Yes, most A&A works require approval.
We handle the entire process with our QP (Qualified Person):
Approvals may include:
BCA submission
URA clearance
SCDF fire safety
PUB drainage
NParks setback requirements
The scope depends on the complexity of the alterations.
Frequently Asked Questions (FAQ)
1. What is the meaning of A&A in Singapore?
A&A refers to Addition & Alteration works — structural changes that do not exceed BCA’s reconstruction threshold.
2. How much does A&A work cost?
Most landed A&A projects cost $150,000 to $600,000 depending on scope.
3. How long does A&A usually take?
A typical project takes 6 to 12 months from design to completion.
4. Do I need approval from BCA?
Yes — all structural A&A works require approval.
We handle it fully.
5. Can I add a third storey or attic?
Yes — depending on your plot ratio and URA zoning.
6. Should I do A&A or rebuild?
If more than 50% of the structure needs to be changed → rebuild is recommended.
Let’s Work Together
We're here to help you bring your construction project to life! Whether you have questions, want to discuss your ideas.