Botany Home Builder — Custom Homes, KDR, Duplex
Licensed NSW builder (HBL 487805C) · Fixed-price contracts · Bayside DA + CDC managed in-house
Botany is the suburb between Mascot and Botany Bay — Federation cottages, inter-war heritage, post-war fibro/brick and contemporary on 400–700m² blocks. Heritage Conservation Areas in pockets including Botany village. Industrial-legacy contamination on remediated parcels around Port Botany. Botany Sands soil with elevated water table. ANIP flight-path overlays.
Bayside Council controls planning across Botany, with R2 Low as the dominant zone and a duplex minimum of 600m² (Bayside DCP — R2 dual occupancy) where dual occupancy applies. Soil sits at M, and most homes here date from 1910s–1970s — so demolition, slab and structural assumptions all need to be set against that, not a generic Sydney average.
Council
Bayside
Median price
$1.7M–$2.6M
Build cost (mid-spec)
$2,000–$3,000/m²
Typical lot
400–700m²
Soil class
M
DA timing
11–15 wks
Builder perspective
Building in Botany — what we actually look at first
Botany carries an industrial past under its houses, and a builder in Botany checks the ground's history before the floor plan. Between Mascot and the bay, the suburb mixes Federation cottages, inter-war heritage, post-war stock and contemporary homes on 400–700m² blocks, with Heritage Conservation Areas around Botany village — but remediated industrial parcels near Port Botany mean contamination management sits under some blocks.
Three facts shape a Botany job. The contamination history on the remediated parcels, which the environmental record and geotech settle before design; the Botany Sands soil with its elevated water table, which drives footing and waterproofing design; and the ANIP flight-path overlays, which put acoustic treatment into the drawings. Where a block sits in the village Conservation Area, heritage controls apply too. It's a suburb that rewards a builder who does the homework. We read the land record, the water table and the acoustic requirement first.
Oliver Alameri — Founder & licensed builder
HBL 487805C · Reading Botany sites since day one
Botany build context
The data we use to feasibility-check a Botany lot before quoting.
Council
Bayside
Postcode
2019
Primary zoning
R2 Low
Typical lot size
400–700m²
Predominant home era
1910s–1970s
Soil class (AS 2870)
M
Duplex minimum lot
600m² (Bayside DCP — R2 dual occupancy)
Median price band
$1.7M–$2.6M
Granny flat rental
$480–$720/week (post-war stock supports siting)
Train station
Bus to Mascot (T8, 2 km)
Build cost (mid-spec)
$2,000–$3,000/m² · Rawlinsons 2026
Why owners build with Buildana in Botany
Same six facts on every contract — we just write them down so you can hold us to them.
- Fully licensed (HBL 487805C) and insured — fixed-price scope from contract through to handover with HBCF cover.
- Bayside approval pathway managed end-to-end — CDC where compliant, full DA where the merit pathway is the right call.
- Structural, BASIX and RFS work coordinated by our team — no juggling separate consultants.
- Fibro and old-stock asbestos handled by SafeWork-licensed crews — priced upfront, not back-charged later.
- Fixed-price HIA contract — every inclusion itemised, every PC sum justified, no "see clause 17" mid-build surprises.
- Anchored on the amanah principle — the scope on contract day is the scope at handover. Local landmark: Botany village & Sir Joseph Banks Park. Train: Bus to Mascot (T8, 2 km).
Botany build economics
Indicative cost ranges for a Buildana build in Botany, benchmarked against the Rawlinsons Australian Construction Handbook 2026 Sydney baseline and adjusted for the local cost profile (Botany sits below the Sydney median by 3%). Every figure is a starting point — a real feasibility shifts it by site condition, brief and finish spec.
| Build type | Indicative range | Spec assumptions |
|---|---|---|
| Single-storey custom home (200m² GFA, mid-spec) | $2,000–$3,000/m² × 200m² | Brick veneer, ColorBond roof, mid-tier joinery and finishes — Rawlinsons 2026 Sydney medium-spec baseline. |
| Double-storey custom home (300m² GFA, mid-spec) | $2,000–$3,000/m² × 300m² | Two-storey brick veneer, light-frame upper, ColorBond or tile, mid-spec finishes — first-floor adds engineering and access loadings. |
| Premium custom home (350m²+, full-brick or rendered) | $3,000–$5,000/m² × 350m²+ | Full-brick or rendered structure, hardwood or stone external, custom joinery throughout — Rawlinsons high-spec baseline. |
| Detached duplex (combined 350m² GFA) | $3,000–$3,000/m² combined | Twin-slab on separate footings or party-wall slab; independent services; BCA Vol 2 acoustic separation. |
| Knockdown rebuild (200m², mid-spec, includes demo) | $2,000–$3,000/m² × 200m² + $0–$0K demo | Demolition (incl. SafeWork-licensed asbestos clearance), geotech, slab, frame, full mid-spec finish. |
| Granny flat (60m², Class 1a) | $180,000–$260,000 turnkey | Class 1a secondary dwelling, full kitchen + bathroom, BASIX-compliant, SEPP-pathway CDC where lot qualifies. |
Source: Rawlinsons Australian Construction Handbook 2026 (Sydney section), adjusted for Botany cost profile via Buildana's internal suburb cost-adjustment matrix. Figures exclude land, professional fees, council contributions and FF&E.
Free Botany feasibility
Thinking about building in Botany? Start with the numbers, not a sales pitch.
Send us your address and rough brief. We'll come back with a straight read on your block — zoning, soil class, frontage, approval path and a real cost range against Rawlinsons 2026. No obligation, no pressure, just the facts you need before you spend a dollar on design.
Buildana services in Botany
All six core services delivered across the Bayside — each one priced against Botany's specific site context, not a generic Sydney baseline.
Knockdown Rebuild
We tear down, dig the right footings for the soil profile, then rebuild — same crew the whole way through.
Botany knockdown rebuild approachDuplex
Detached duplex on the lots that allow it — twin homes, independent driveways, independent BASIX, often Torrens-title at completion.
Botany duplex approachGranny Flat
Secondary dwellings under SEPP — 60m², usually CDC, often no neighbour notification needed.
Botany granny flat approachCustom Home
Design and construct under one fixed-price contract — the architect and the builder are on the same team from concept.
Botany custom home approachExtension
Extensions that look like the home grew that way — not a clear before/after line at the addition boundary.
Botany extension approachRenovation
Renovation done by a licensed builder, not a generalist — structural changes, waterproofing and finishes all in one contract.
Botany renovation approachApproval pathway in Botany
Bayside Council, the southern coastal-and-airport-adjacent council.
Bayside Council runs the local planning controls for Botany — DCP setbacks, character provisions, heritage overlays where they apply. For a standard knockdown rebuild on R2 Low, the CDC pathway through a private certifier usually clears in 15–25 working days for code-compliant rebuilds if the design hits every code requirement. For duplex on 600m² (Bayside DCP — R2 dual occupancy)+ lots or attached dual occupancy on R3 land, a DA is almost always required and 11–15 weeks for a single-dwelling da. Granny flats under SEPP (Affordable Rental Housing) are CDC on most compliant secondary-dwelling lots — 60m² cap, no neighbour notification.
CDC pathway
Private certifier · 15–25 working days for code-compliant rebuilds · no neighbour notification. Design must comply exactly with the Codes SEPP.
DA pathway
Bayside merit assessment · 11–15 weeks for a single-dwelling DA · DA fees $2,000–$3,500 base for a Class 1a residential DA. Used where the design pushes a code limit.
Section 7.11 / 7.12 developer contributions in Botany: Are modest (typically $8K–$15K per dwelling).
Botany site considerations
On M ground — typical for Botany — the slab system is one of three: waffle pod (cheapest, only on lower reactivity), stiffened raft (mid-range, most common), or piered slab into bedrock (highest cost, where reactivity is extreme or bedrock is shallow). The geotech report tells us which, and we price the contract against that report — not against the cheapest option we hope we can get away with.
Soil & footings
Class M (Wianamatta Shale + Botany Sands) / Class P/E (alluvial near Cooks River + Botany Bay foreshore) reactivity drives waffle-pod, stiffened raft or piered slab — engineered to a real geotech, not a desktop guess.
Demolition
Pre-1990 1910s–1970s stock means SafeWork-licensed asbestos clearance — priced into the contract upfront, with the clearance certificate before slab pour.
Flood & bushfire
Flood risk: low. Bushfire risk: very low. Heritage exposure: moderate. We map your lot against each before quoting.
Local overlays the Bayside planner will check first
- Foreshore Scenic Protection Area (Botany Bay)
- Acid sulfate soils (extensive)
- Aircraft noise (ANEF) overlays for lots near Sydney Airport
- Heritage Conservation Areas (Rockdale, Brighton-Le-Sands, Mascot)
Recent builds nearby
Buildana projects in the Bayside
We work continuously across Bayside — single-storey customs, double-storey rebuilds, side-by-side duplex on R2 lots that comply with Bayside's DCP minimum frontage, granny flats on SEPP secondary-dwelling pathways. Most projects start with the same conversation we'd have about your Botany site: title, zone, slope, frontage, soil. Then design. Then fixed-price contract.
Real project case studies
Read full Buildana builds — the challenge, the fixed-price solution, the real timeline and cost — across Western Sydney.
Read case studiesBayside hub
Full Bayside builder hub — every suburb we work in, every service, council pathway notes.
Open Bayside hubFree Botany site check
Send your Botany address — we'll run title, zone, slope, frontage and soil before you spend a dollar.
Book a site checkBotany build FAQs
The questions we get asked most often on a first Botany site walk.
- What soil class is typical in Botany 2019?
- Botany ground is typically M based on the AS 2870 site classifications and geotech we've worked with in the suburb. That drives slab design — waffle-pod, stiffened raft or a piered system depending on the report. We never assume it; every Buildana build commissions a geotechnical investigation before slab engineering. The geotech report is yours to keep, regardless of which builder you use after.
- What does it cost to knock down and rebuild in Botany?
- End values in Botany sit in the $1.7M–$2.6M range based on recent sales. A typical knockdown rebuild — demo, asbestos clearance, geotech, slab, frame, full mid-spec finish for a 200m² single-storey — runs $2,000–$3,000/m² × 200m² + $0–$0k demo as a Rawlinsons-aligned 2026 baseline. We benchmark every line to the Rawlinsons Australian Construction Handbook, not back-of-envelope figures. Send through your block address and we'll run a proper feasibility against what's actually achievable on the lot.
- Do you do extensions and renovations in Botany?
- Yes — ground-floor additions, second-storey adds, full-house renovations, kitchens and bathrooms in Botany. The complication on 1910s–1970s housing stock is that you can't price an extension off the plans alone — we pre-investigate the existing slab, frame, roof tie-in and wet-area waterproofing before quoting. Surprises during demolition are the most common reason renos blow their budget; we eliminate that by inspecting first.
- How long does a DA take with Bayside Council?
- 11–15 weeks for a single-dwelling DA. CDC through a private certifier is the alternative where the design complies with the Codes SEPP — 15–25 working days for code-compliant rebuilds. Council DA application fees fall in the $2,000–$3,500 base for a class 1a residential da range. Buildana lodges either pathway and runs all RFI responses through to determination.
- Why does Botany cost different from a generic Sydney average?
- Botany sits very close to the Sydney metropolitan median build cost, with small adjustments for local site access and trade availability.
- How long does a custom home build take in Botany?
- From contract signed to handover, a single-storey 4-bedroom custom home in Botany typically takes 9–11 months on a CDC pathway, or 12–14 months if the design needs a DA through Bayside Council. Add 4–6 weeks for double-storey. Pre-construction (design, engineering, BASIX, approval, contract) runs in parallel and adds another 8–16 weeks before site start. Buildana sequences both phases so the design effort and the approval effort don't sit waiting on each other.
- Can I build a duplex in Botany?
- Duplex feasibility in Botany depends on lot size and zoning. The minimum lot for dual occupancy under Bayside Council's DCP is 600m² (Bayside DCP — R2 dual occupancy), and R3 Medium Density lots in the suburb can support attached duplex or townhouse configurations. We run a feasibility check on title, zone, area, frontage and slope before quoting — no point designing what won't approve.
- What's the granny flat pathway in Botany?
- Granny flats in Botany are usually built under State Environmental Planning Policy (Affordable Rental Housing) 2009 — secondary dwellings up to 60m², CDC pathway, no DA required on most compliant R2 Low lots. Typical rental return is $480–$720/week (post-war stock supports siting). The block needs minimum 450m², a primary dwelling already on it, and compliance with side/rear setbacks. Where the lot doesn't comply with SEPP, we lodge a DA with Bayside Council.
Nearby Bayside suburbs we build in
Adjacent Bayside suburbs covered by the same Bayside approval pathway and a similar site-cost profile.
Ready to talk about your Botany build?
Free site feasibility, honest cost framing against $2,000–$3,000/m²/m² baseline, fixed-price contract. Bayside pathway managed in-house — no surprise variations.