A&A Submission Singapore: When Renovations Need BCA Approval (2026 Guide)

In short: An A&A (Addition & Alteration) submission is the BCA approval required for renovation, extension, or change-of-use works affecting structural elements in Singapore. Required when load-bearing walls, columns, beams, or slabs are altered. Endorsement by a registered PE Civil is mandatory before construction. Typical fees: S$1,500–S$5,000 residential, S$3,000–S$10,000 commercial. Timelines: 1–3 weeks for the PE side, 4–8 weeks for full BCA approval. Most renovations that don't touch structural elements (paint, partition walls, finishes) do NOT require A&A.

When You Need an A&A Submission

• Removing or modifying load-bearing walls (most common scenario in landed and HDB renovation)

• Adding mezzanine floors or intermediate levels

• Cutting new openings in load-bearing walls or slabs

• Modifying or removing structural columns or beams

• Roof terrace conversions to enclosed habitable rooms

• Backyard, courtyard, or rooftop extensions

• Industrial unit modifications (added platforms, equipment supports, cantilevers)

• Change of use that introduces higher structural loads (e.g. residential to commercial, office to gym, etc.)

When You DO NOT Need an A&A Submission

• Painting, wallpaper, or surface finishes

• Floor or wall tiles (where structural slab is unaffected)

• Removing or adding non-structural partition walls

• Furniture, fittings, lighting, electrical works (within original load capacity)

• Bathroom and kitchen fit-outs (without altering structural elements)

When in doubt, consult a PE before commencing. The cost of a quick PE review is fractional compared to the cost of demolition or rectification after BCA enforcement.

The A&A Submission Process

1. Site survey: PE inspects the existing structure, identifies load paths, and confirms which elements are load-bearing.

2. Design: PE designs structural changes — transfer beams, replacement columns, openings, slab modifications. Calculations to Eurocodes and Singapore Standards.

3. Drawings: Structural drawings prepared and cross-coordinated with architectural drawings.

4. BCA submission: PE-endorsed package submitted via CORENET-X (or legacy CORENET, depending on tier).

5. Approval: BCA reviews and issues approval (or comments). Construction can commence after approval.

6. Site supervision (optional but recommended): PE oversees critical structural works to ensure construction matches approved drawings.

Pricing

• Small residential A&A (single wall removal, single opening): S$1,500 – S$3,000

• Standard residential A&A (multiple modifications): S$3,000 – S$5,000

• Commercial / industrial A&A: S$3,000 – S$10,000

• Major A&A (mezzanines, large extensions, change of use): S$10,000 – S$50,000

About CVC Engineers

CVC Engineers Pte Ltd handles A&A submissions for residential, commercial, and industrial projects in Singapore. Lead PE: Er. Cavan Chai Han Hon, PE (Civil), PEB Reg. No. 5376. 300+ projects with HDB, LTA, PUB, MOE, MHA, and the Singapore private sector. Phone: +65 9342 7551 · Email: stephen@cvcengineers.com.