Addition and alteration, or rebuild

You own a landed house and it no longer fits. The question is not whether to spend money on it — you already know you will. The question is scope: patch and extend the house you have, or take it down and start again. URA draws the line between those two paths with an arithmetic test, not a feeling, and the test decides almost everything downstream of it — what you can borrow, what you can use CPF for, how long you're displaced, and what the house is worth when you eventually sell it.

This page works through that one decision: the mechanics that classify a project as A&A or reconstruction, who is even allowed to choose, what each path costs in tax, financing, time and eventual resale value, and where a landed rebuild sits inside your estate and your balance sheet. It does not repeat the cost tables, the ROI question or the pre-sale renovation case — those are worked through in full on the sibling pages this one links to.

The mechanics: what makes it A&A, and what forces reconstruction

URA's dividing line is the 50% test. A proposal stays an addition and alteration only if it adds no more than 50% to the existing approved gross floor area, replaces no more than 50% of the existing approved external walls, and changes structure — new columns, beams, rebuilt floor slabs — on no more than 50% of the existing floor area. Cross any one of those three thresholds and the project is no longer A&A; it is a new erection, assessed as reconstruction.

Two things force reconstruction regardless of the GFA arithmetic: adding a storey (including replacing the whole roof in a way that effectively adds one), or changing the housing form — a semi-detached house becoming a bungalow, for instance. Short of that, you can replace the entire roof of a landed house, whatever the increase in height, as long as it adds no storey; and you can add an attic, as long as the extra floor area it creates stays inside the 50% GFA cap.

Whichever route you take, Envelope Control sets the ceiling you're building inside: 12 metres overall in two-storey landed estates, 15.5 metres in three-storey estates, measured from the external platform level, with sloping-site protrusions and lift overruns allowed up to a further 1 metre beyond that. A rebuild does not buy you a taller house than a well-planned A&A could have reached inside the same envelope — it buys you the right to reorganise everything inside it from a clean structural slate.

If your existing house already sits outside the permissible envelope — common on older landed stock built under looser rules — an A&A cannot make that non-conformity worse; URA assesses on the merits so the applicant is not made worse off, but the retained bulk cannot grow. Where you keep non-conforming structures, URA now asks for a Professional Engineer's certification that what you're keeping is structurally sound, and on some sites requires you to retain at least 25% of the existing floor plate as an integrated structural wing with a minimum 2.4 metre front setback where the existing setback is deficient. A rebuild sidesteps all of this because nothing old is being kept.

Either way, a Qualified Person — a registered architect or Professional Engineer — has to lodge the application with URA: proposal plan, sketch plan, declaration of compliance. The lodgment authorisation is valid two years from the acknowledgement letter, extendable up to two times before you'd have to lodge fresh. That clock is worth knowing before you commit a QP's fee to a design you might sit on.

One trap specific to a newly subdivided lot: within the first three years from TOP, an addition or alteration under URA's lodgment route cannot add more than 20 sq m of GFA. If you bought a recently subdivided plot expecting to extend it immediately, check the TOP date first.

• Stays A&A: added GFA ≤50% of approved GFA
• Stays A&A: new external walls ≤50% of approved external walls
• Stays A&A: structural change ≤50% of approved floor area
• Stays A&A: full roof replacement, provided no storey is added
• Forces reconstruction: adding a storey, by any method
• Forces reconstruction: changing housing form (e.g. semi-detached to bungalow)
• Forces reconstruction: any one of the three 50% thresholds exceeded

Eligibility: who actually gets to choose

If your house sits on its own title — a standalone terrace, semi-detached, detached or bungalow — this decision is yours alone to make, subject only to URA, BCA and the other agencies. If it's strata landed — a cluster house inside a shared strata title — it is not. Any external, structural or facade change needs the Management Corporation's written consent before BCA or URA will even accept a submission, and the MC's own approval clock is reported as the single biggest scheduling risk in the whole project, ahead of BCA or URA's processing time: a simple request 4 to 6 weeks, anything touching facade, structure or M&E, or drawing revisions, 4 to 6 months — before the ordinary A&A machinery even starts running. Full demolition and rebuild of a strata landed unit isn't an individual decision at all; it runs through the collective-sale mechanism under the Land Titles (Strata) Act, needing a majority of owners by both count and share value. One owner deciding to rebuild, on strata landed, simply isn't a choice this page's mechanics apply to.

Good Class Bungalow Areas carry their own gate on top of the A&A/rebuild mechanics: only a Singapore Citizen may buy landed residential property inside a gazetted GCB Area at all; a PR, foreigner or company needs ministerial approval that is rarely granted. That's a question about whether you can own the plot, not about which renovation route you take once you do — but it means a GCB owner considering a rebuild is, by definition, working inside a smaller, more scrutinised planning envelope (35% site coverage against the ordinary landed cap) than everyone else on this page.

Citizenship status: mostly settled already

For most readers of this page, the citizenship question was answered when you bought the land — you're a Singapore Citizen, or a PR, or a foreigner who cleared Land Dealings Approval Unit approval to hold landed property in the first place, or a national of the US, Switzerland, Liechtenstein, Norway or Iceland taxed on stamp duty as a citizen under the relevant free trade agreement. Rebuilding or extending the house you already own doesn't reopen that test; you're not acquiring anything.

It reopens only if the plan involves buying more land — an adjoining plot to enlarge the footprint before you rebuild, say. That's a fresh acquisition, tested on the same rules as any other landed purchase: LDAU approval for a foreigner, full stamp duty exposure, and, worth flagging precisely because it surprises people, FTA parity is a stamp-duty concession only — it does not touch the Residential Property Act. A US national buying landed housing under FTA parity still needs the same LDAU approval, on the same PR-of-five-years-plus test, as any other foreign buyer.

Taxes: not a purchase, but not tax-free either

Because neither A&A nor a rebuild is a sale or a purchase, Buyer's Stamp Duty, Additional Buyer's Stamp Duty and Seller's Stamp Duty don't apply to the construction itself — there's no transaction for them to tax. The tax exposure that does exist is narrower but real, and it splits three ways: property tax during construction, a demolition trigger, and the SSD comparison against the alternative this whole page is implicitly weighing — selling instead.

IRAS will let owner-occupier property tax rates continue on a land parcel under construction for a single house you intend to live in, for up to 2 years, provided the land's Annual Value is below S$108,625 — from the later of the land assessment date or the date building plans are submitted, to the earlier of TOP/CSC or the two-year limit. You then have to actually live in the replacement house for at least a year from TOP or CSC, and you can't be claiming owner-occupier rates on any other property during the remission window.

Demolishing the old structure resets the Annual Value to 5% of the land's estimated freehold value, taxed at the flat 10% non-residential rate until the new house is up — and you must notify IRAS within 15 days of demolition, with a fine of up to S$5,000 plus interest if you don't. An A&A that stays under the 50% thresholds never triggers this at all, because nothing is being demolished wholesale.

The tax that actually disciplines the decision is Seller's Stamp Duty, and only because it's the tax on the alternative you're not taking. If you sell the house as-is instead of rebuilding it, and you bought it within the last four years, SSD runs 16% in year one, 12% in year two, 8% in year three, 4% in year four, computed on the higher of price and market value, before it drops to nil. A rebuild avoids that tax entirely because you keep the title — which is one honest reason, independent of any renovation-ROI argument, that a house bought recently is more often extended than flipped.

Borrowing: two different products, two different CPF answers

A&A is financed as a renovation loan, and a rebuild is financed as a construction loan — they are not the same product with a different label, and the difference matters more than the rate does. A bank renovation loan is capped at S$30,000 or six times monthly income, whichever is lower, tenure up to five years, at an effective rate sources put anywhere from about 2.5% to nearly 6%, plus a processing fee typically 1% to 1.25% and a prepayment fee around 1%. On any A&A big enough to be a real intervention — the kind this page is actually about — S$30,000 doesn't come close to covering it, so the balance is funded from cash, equity or a personal loan, not a renovation loan proper. [⚠ borrow.reno.fee_and_penalty_structure_2026_09_16: sources differ; awaiting a ruling]

A construction loan for a full rebuild is a different instrument: it's drawn in stages against certified progress, interest charged only on what's actually been drawn, LTV of 75% measured against the bank's valuation of the completed home — land plus building — with any existing land loan deducted first. A bank will typically cap a standalone land loan nearer 55% LTV, and one broker's terms report up to 75% of total rebuilding cost financed this way, the remaining 25% in cash, at a rate above a standard mortgage until the facility converts to an ordinary home loan after TOP. Because banks assess the land loan and construction loan together, and because they're reported to value a home slated for demolition conservatively, the loan quantum available during a teardown can come in below what the same land would support once the new house stands on it.

CPF draws a sharper line than either bank product does. CPF Ordinary Account savings can repay a construction loan for building a house on land you already own — it's on CPF's own list of approved housing uses. Adding rooms or extending a property you already own is classified as renovation, and CPF explicitly cannot be used for renovation, improvement or repair work at all, no exceptions listed. That single classification is, for a lot of owners, the real deciding factor between the two paths: a full rebuild can be funded partly with CPF; an equivalent-cost A&A cannot be funded with a single dollar of it.

What each path actually costs, and what it's worth after

Commercial estimates for major A&A on a landed home run roughly S$180-300 per sq ft of construction, against S$1.2m-2m or more for a full rebuild on the same footprint — the same publishers, re-read months apart, don't even agree with their own earlier figures, so treat any single number here as a planning range, not a quote. One consistent shape survives the noise across every source that publishes both figures side by side: an extensive A&A can run to 60-80% of the cost of a full rebuild, without ever getting the benefit of a clean structure, new services, or a fresh Certificate of Statutory Completion clock. That is the single sentence that should decide most borderline cases — if your A&A is already brushing the 50% GFA ceiling, you may be paying rebuild-adjacent money for less than a rebuild's result. [⚠ aa.cost.plb_reread_2026_09: sources differ; awaiting a ruling]

Timelines diverge just as widely between sources — one publisher's own re-reads of the same page put A&A anywhere from 6 to 24 months and rebuild anywhere from 12 to 38 months, depending on when it was read. A rebuild also pulls in more agencies than an A&A does — URA, BCA and potentially NParks, LTA, NEA and PUB, against URA and BCA alone for most A&A work — which is a real driver of the wider timeline, not just an artefact of bigger scope.

On exit, valuers price landed property as land first, at a comparable land rate, and the existing building second, at its depreciated value — not at what it cost to build. A structure 20-plus years old contributes little to that number; a house rebuilt within the last few years commands a real premium; and a decade-old renovation, however extensive, is largely not recovered. One worked illustration puts a 15-year-old renovation as adding only S$200,000-400,000 of value on a S$4.8m land basis — far below what it cost. Fresh construction is priced differently from old construction, however good the old construction still is.

The case-study evidence cuts both ways, which is itself the honest finding. One well-documented rebuild — a 1960s single-storey Serangoon Gardens house rebuilt into a three-storey home for just over S$1.5m — resold for over S$5m, a strong margin even after ABSD and renovation costs. A separate case, finished to a high specification with a large budget, struggled to attract strong offers against comparable Singapore landed houses — attributed to the site's orientation, not the spend. The spend buys you a better house; it does not, by itself, buy you a better outcome if the underlying plot has a problem money can't fix.

Be skeptical of any pre-sale renovation claim quoting a clean percentage uplift — 15-30% from one contractor, 10-20% from another — none of it independently verified, none of it naming a base price, and one contractor guide's own framing warns that renovation over S$80,000 on a landed home is often not recovered on sale at all, because a buyer who dislikes your taste replaces it. Treat contractor ROI claims as marketing until you've seen the comparable sales yourself.

Conveyancing: the paperwork stands in for a sale

There's no buyer, no seller, no Option to Purchase, no completion — so conveyancing in the ordinary sense doesn't apply to either path. What replaces it is the QP lodgment itself: the proposal plan, sketch plan and declaration of compliance your architect or engineer files with URA, running through CORENET, with the same two-year authorisation clock as any other A&A submission. A rebuild's equivalent is heavier, not different in kind — the same lodgment discipline, applied across more agencies and a longer BCA plan-approval chain, because you're submitting a new building rather than a modification to an approved one.

If your project does involve buying an adjoining plot first, ordinary conveyancing returns for that purchase alone — stamp duty, a lawyer, SLA lodgment — layered on top of, not instead of, the URA/BCA process for the build itself.

Estate: who decides, and what happens if you can't

A landed rebuild or major A&A is a multi-year commitment made in one person's name, usually funded by debt and drawn down in stages — which makes the capacity question sharper than it is for most property decisions. An LPA lets a donee you appoint now keep making property and financial decisions if you later lose mental capacity, but only once it's registered and a doctor has certified the loss of capacity; without one, a bank will freeze the accounts funding your construction loan draws the moment incapacity is suspected, pending a court-appointed deputy. And an LPA is automatically revoked on death — if you die mid-project, the donee's authority ends immediately and whoever inherits the half-built house has to wait for a Grant of Probate or Letters of Administration before they can even instruct the contractor to keep going.

Where the house is jointly owned by siblings, or held for an eventual inheritance, the A&A-versus-rebuild decision is exactly the kind of disagreement that stalls a family for years — one sibling wants to preserve the house as-is, another wants to modernise it, a third wants to sell. That's a distinct problem from the mechanics on this page, and it's covered on its own terms elsewhere.

The twelve questions

Two questions sort every property decision, and they are not "are you buying to invest or to live in it" — nobody commits to an asset believing it will fall in value, so that question sorts nobody. The real questions: are you borrowing to fund this, and once it's done, are you letting any part of it out? On a landed rebuild you already own, Q1 usually means the construction loan; Q2 is usually no, because you're building the house you live in, not an income property. That combination — borrow, own-use — is negative carry by construction, and most owners in this position never say it in those words.

C0 THE PLAY. This isn't a purchase — it's a reshaping of something you already own. There's no yield to underwrite; it's a balance-sheet move, not a cash-flow one, unless part of the finished house is going to be let out.

C1 BALANCE SHEET. What you own changes — a bigger, newer, differently-configured house on the same land. What you owe usually changes too, if any part of the S$400k-2m-plus is financed rather than paid in cash.

C2 CASH FLOW. Money moves out in construction-loan draws, contractor progress payments, temporary housing rent while you're displaced, and CPF-ineligible costs paid in cash if it's an A&A rather than new construction. Nothing structural moves in during the build, unless part of the house is already let.

C3 P&L. Not the same thing as cash flow. A rebuilt house may carry a higher valuation on paper the day it's TOP'd, but that's an unrealised gain, not profit — it becomes real money only on a sale, and only at whatever the market actually pays for it then.

C4 CARRY. Income minus financing cost. During construction, income is zero and financing cost is running on every drawn dollar — pure negative carry, guaranteed by the structure of the project itself, for the entire build period.

C5 GIVE / GET. You give cash, 6 months to several years of disruption, and — for a rebuild — the depreciated value of the old structure, written off to demolition. You get a house shaped closer to how you actually want to live, inside whatever the 50% test and Envelope Control allow.

C6 EXPOSED TO. Construction cost inflation, contractor and QP delay, MCST or multi-agency approval risk, demolition surprises on older sites, and a bank valuing the torn-down plot more conservatively than the finished house will eventually be worth.

C7 FOR HOW LONG. A&A commonly 6 months to 2 years; a rebuild commonly 12 months to over 3 years, by different sources' own accounting — and the clock doesn't start moving your family back in until TOP or CSC, whichever the project needs.

C8 FAILURE CASCADE, in order. Negative carry through the build accumulates into a cash-flow strain if temporary housing and staged draws run longer than budgeted; that strain shows up in the P&L as a cost overrun once it's finally booked; a conservative bank valuation on the torn-down land can leave you in negative equity relative to what you've already spent; a half-finished house is the least liquid state a landed asset can be in; and if the cash gap can't be bridged, the endpoint is a forced, distressed sale mid-project — insolvency, not just a bad year.

C9 LIQUIDITY. A completed rebuild sells at land value plus a real premium for new construction. A half-finished one sells, if it sells at all, at a steep discount to what's already been spent — there's no market for someone else's unfinished design.

C10 CONTROL. This is what the whole page is actually about. Reno, A&A and rebuild are this page's expression of control — the same lever that shows up as tax structuring at one lifecycle phase and financing structure at another. But the control is bounded: the 50% test caps how far an A&A can go before it's reclassified; MCST consent removes the decision from you entirely on strata landed; Envelope Control caps the outcome regardless of budget. You're choosing how much control to exercise inside limits you don't set.

C11 THE EXIT. Two exits exist, and this page is the choice between them. Rebuild, then eventually sell into a market that prices fresh construction at a real premium over old. Or sell now, as-is, and pay SSD if you're still inside the four-year holding period — the tax that exists specifically to discourage the exit this page's alternative avoids.

The trades this project actually employs

Neither path runs on one contractor. A landed A&A or rebuild of any real size employs a Qualified Person — a registered architect or Professional Engineer — to design and lodge the submission; a BCA-registered builder, mandatory for structural work; a structural engineer and often a separate M&E engineer; a quantity surveyor on larger projects to keep the budget honest against the QP's drawings; and, on strata landed, the Management Corporation's own approval process sits ahead of all of it. A rebuild adds a demolition contractor and, because more agencies are in the chain — URA, BCA, and potentially NParks, LTA, NEA, PUB — often a submission consultant to manage the sequence. On the financing side, a mortgage broker structuring the land loan and construction loan together is common, because the two are assessed as one exposure by the bank, not two separate applications.

What a realtor earns on this, and doesn't

State this plainly: a property agent earns nothing directly from either path on this page. No sale happens, so there's no commission-bearing transaction for a Prescribed Estate Agency Agreement to attach to. That has a real, if uncomfortable, implication for whose advice you're taking. An agent who tells you to rebuild rather than sell is giving you advice that earns them nothing this cycle; an agent who tells you to sell the house as-is and buy a completed one elsewhere earns a commission on the sale, and often a second one arranging the purchase. Neither answer is wrong on its own, but the incentive runs one way and it runs against the option this page spends most of its words on. If a realtor is advising you on this decision at all, ask directly which side of that they're on before you weight the advice.