Rear and wet-kitchen works
Rear extensions, wet kitchens, service areas and the relationship between new works, existing drainage and roof junctions.
Extensions · Car porch · Rear kitchen · Side-yard
Landed A&A works with feasibility, approvals and site condition considered early.
Additions and alterations (A&A) can look simple on a floor plan while touching structure, drainage, waterproofing, facade or authority requirements in practice. LIMM starts with the existing property and the intended change before promising a construction path.
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Our approach
The focus is practical improvement for existing landed homes: additional usable space, better daily flow and more resolved external areas, with proper professional review where the scope requires it.
The first conversation is more useful when the site context and household or business priorities are visible before details are fixed.
Scope
Common A&A conversations we can review
The exact work depends on the property, but these are the connected areas that usually shape the review.
Car porch and shelter changes
Shelters, gates, access, surface falls, drainage, vehicle movement and the connection back to the main house.
Side-yard and balcony changes
Usable-area improvements with attention to weather exposure, waterproofing, neighbours and the existing building envelope.
Facade and opening changes
Glazing, doors, windows, facade refreshes and other external changes reviewed against actual site and approval needs.
Choose the right route
Interior renovation, A&A and reconstruction are not interchangeable.
The label affects the checks, professional team and programme. It should follow the actual proposal—not be chosen because one route sounds faster or cheaper.
Interior-focused renovation
Work largely within the approved house can still involve serious coordination, but may not alter the building form, add gross floor area or trigger the same planning route as an extension.
Additions & Alterations
A&A may include additions or changes to the existing landed house, provided the proposal remains within URA's prevailing A&A criteria and other applicable requirements.
Reconstruction
A proposal that falls outside URA's A&A criteria, adds a storey or changes the landed housing form is treated differently and requires the corresponding professional and approval route.
Project-specific assessment
Approved GFA, external walls, structural changes, roof works, the existing envelope and previous approvals all matter; the visible size of an extension alone is not enough.
Start with feasibility, not a construction promise.
Send the approved or existing plan, site photos and the alteration you want. LIMM can identify the questions that need to be resolved before the working scope is fixed.
Planning checks
A&A review comes before certainty
The required architect, engineer, qualified person or authority submission depends on the property and proposed works. These roles should be identified clearly rather than hidden inside vague promises.
- Existing drawings, previous approvals and known alterations
- Structural elements affected by the intended work
- Planning, building, drainage or other technical requirements
- Roofline, waterproofing and connection between new and existing work
- Site access, neighbours, temporary protection and construction sequencing
Cost and programme
The main drivers behind an A&A budget and timeline.
A rear kitchen, car-porch change and additional storey are fundamentally different projects. These factors explain why a generic online rate or duration is rarely decision-ready.
Approved versus existing condition
Available plans, previous additions and non-conforming or undocumented work can affect the information and professional review needed first.
Structure and ground conditions
Openings, columns, beams, slabs, foundations and the way new work meets the existing house can change both design and construction scope.
Roof, drainage and weathering
Extensions create junctions. Roof falls, waterproofing, stormwater paths, platform levels and exposed boundaries need coordinated details.
Submission and construction sequence
Professional appointments, authority review, neighbour-sensitive work, temporary protection, procurement and site access shape the realistic programme.
Completed LIMM Works project · Landed & A&A
Landed entry and glazing works
Entry, glazing and external-transition details considered together with access, weather exposure and the existing house condition.
EntryGlazingExternal works
View this completed project Official guidance
Use the prevailing URA criteria—not a simplified 50% slogan.
URA's current A&A criteria consider additional GFA, external-wall replacement, structural changes, roof works and attic additions. Proposals outside those criteria, an added storey or a change in landed housing form are treated as reconstruction.
Official requirements can change. Links below point to the current official pages and open in a new tab.Urban Redevelopment Authority
URA: A&A criteria for terrace houses
Current additions-and-alterations criteria and treatment of proposals that become reconstruction.
Open official guidance ↗Urban Redevelopment AuthorityURA: A&A criteria for semi-detached houses
The corresponding prevailing criteria for semi-detached landed housing.
Open official guidance ↗Urban Redevelopment AuthorityURA: Land-titled residential
A homeowner-oriented overview of common landed alterations and planning-permission examples.
Open official guidance ↗Initial project review
A clearer path from first message to working scope.
The process stays cautious where the site or requirements need deeper checks, while keeping the next practical decision visible.
Describe the intended change
Share the existing plan, site photos, desired extension or alteration, and what the new space needs to achieve.
Identify feasibility questions
LIMM surfaces structural, planning, drainage, roofline and access questions that need to be resolved.
Coordinate required input
Where applicable, professional review and submissions are arranged before the construction scope is treated as approved.
Build the working scope
Design intent, construction details, cost drivers and programme are aligned for the next stage.
Frequently asked
Questions to settle early.
What is the difference between renovation and A&A?
Renovation may improve the existing house without deeply changing the building, while A&A can add or alter areas in ways that affect structure, external form or authority requirements.
Can approval be confirmed from photos?
No. Photos and plans support an initial discussion, but approval and feasibility depend on the property, proposed work and required professional or authority checks.
Does every small extension need the same submission?
No. Requirements vary with the scope and property. The correct route should be established from the actual proposal rather than assumed from size alone.
What should I prepare for an initial A&A review?
Share the existing and approved plans if available, current site photos, the intended addition or alteration, known leaks or drainage issues, household priorities, budget range and preferred timing. Previous approval records are especially useful for an older or already-altered house.
Can LIMM quote A&A works from a floor plan alone?
A plan can support an initial discussion, but a reliable construction scope normally needs the existing condition, structural and approval questions, specifications, access and key details to be understood. Missing assumptions should be identified before detailed costing.
How long do landed A&A works take?
There is no single responsible duration for all A&A projects. The programme depends on design development, investigations, professional appointments, submissions and approvals where required, structural and drainage scope, procurement, site access and construction sequencing.
Owner's Notes
Read before the first review.
Landed & A&A · 9 min read
Wet Kitchen Extension for a Landed Home: What to Check First
Plan the approved footprint, structure, roof junctions, drainage, ventilation, services and construction access before cabinetry is designed.
Read note ↗Landed & A&A · 8 min readLanded renovation vs A&A works: what is the difference?
A practical guide to renovation, additions and alterations, reconstruction criteria and the checks landed homeowners should make before committing.
Read note ↗Planning & approvals · 9 min readCan You Hack This Wall? Checks Before Wall Removal in Singapore
An answer-first guide to plans, wall type, structural review, concealed services and property-specific approval before demolition starts.
Read note ↗Start with practical context
Send the floor plan and current site photos.
Include the property type, rough scope, known issues, budget range and preferred timeline.
Start project review