Thirlmere
44 DAs lodged · last 90 daysMarket Intelligence
DAs Lodged
44↑
past 90 days · NSW Planning Portal
Professionals
—
covering this suburb
Median Project Value
$504,942
DAs lodged, past 90 days
Median Approval Time
22 days
approved DAs, last 12 months
As of 14 July 2026, Thirlmere recorded 44 — Development applications lodged in Thirlmere in the past 90 days (NSW Planning Portal)
As of 14 July 2026, Thirlmere recorded $504,942 — Median estimated cost of development for DAs lodged in Thirlmere in the past 90 days (NSW Planning Portal)
As of 14 July 2026, Thirlmere recorded 22 days — Median lodgement-to-determination time for approved DAs in Thirlmere, last 12 months (NSW Planning Portal)
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Recent Development Applications
Total dev. value
$4,704,940
Development types
Source
NSW Planning Portal
PAN-653642
43 MORRIS CRESCENT THIRLMERE 2572
Dwelling house; Erection of a new structure; Residential Accommodation
$323,336
1-storey · 1 new dwelling
PAN-649641
48 MORRIS CRESCENT THIRLMERE 2572
Shed; Dwelling house; Erection of a new structure
$450,000
1 new dwelling
PAN-653111
40 MICHELL ROAD THIRLMERE 2572
Dwelling house; Erection of a new structure; Residential Accommodation
$1,129,169
1-storey · 2 new dwellings
PAN-652830
38 CHALKER STREET THIRLMERE 2572
Dwelling house; Erection of a new structure
$361,061
1 new dwelling
PAN-652983
15 BRUNDAH ROAD THIRLMERE 2572
Dwelling house; Erection of a new structure
$415,920
1-storey · 1 new dwelling
via Council staff under delegated authority
PAN-651871
4 CHARLOTTE PLACE THIRLMERE 2572
Shed; Erection of a new structure
$26,950
via Council staff under delegated authority
PAN-651898
285 THIRLMERE WAY THIRLMERE 2572
Dwelling house; Erection of a new structure; Residential Accommodation
$480,000
1-storey · 1 new dwelling
PAN-652187
40 CHALKER STREET THIRLMERE 2572
Dwelling house; Erection of a new structure
$468,504
1-storey · 1 new dwelling
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Browse all pros →You need builders in Thirlmere who understand Wollondilly Shire zoning, bushfire overlays, and rural-residential site conditions, before the first slab is poured.
Thirlmere Development Activity Snapshot
Thirlmere sits within the Wollondilly Shire local government area, one of the fastest-evolving rural-fringe corridors in Greater Sydney's south-west. The suburb's 2572 postcode encompasses a community of approximately 3,277 individual taxpayers (ATO, 2022-23 income year), anchored by a growing cohort of young families drawn by land size, relative affordability, and proximity to Picton, Tahmoor, Wilton, and Appin.
Development in Thirlmere skews toward detached residential new builds, secondary dwellings (granny flats), and mid-range home extensions. Rural-residential lot sizes, common across the 2572 postcode, mean site preparation, effluent management, and bushfire asset protection zones (APZs) regularly feature in development applications lodged with Wollondilly Shire Council. Dual-occupancy and small subdivision activity is also emerging as landholders respond to NSW housing policy changes.
The median taxable income for Thirlmere residents is $56,006 (ATO, 2022-23 income year), which positions most owner-occupier projects in the practical mid-range budget bracket, prioritising liveable, durable finishes over premium specifications, with renovation and extension work often staged across multiple years.
Note: Suburb-specific DA volume and median project value data are not available in the current data pack. Figures will be updated when Wollondilly Shire Council planning data is released. Sign up for free DA alerts for Thirlmere to track new applications as they are lodged.
Cost to Build in Thirlmere, What to Budget
Indicative only, figures are ABS-attributed estimates and should not be used as a formal quotation. Obtain a detailed quote from a licensed builder for your specific site.
Construction costs across regional NSW are influenced by labour availability, material freight, and site conditions. In Thirlmere and the broader Wollondilly Shire, several local factors push costs above metropolitan averages:
- Site slope and soil type: Hilly and undulating terrain common in the Thirlmere area increases cut-and-fill, footing depth, and retaining wall costs.
- Bushfire Attack Level (BAL) compliance: Many blocks in the 2572 postcode carry BAL-12.5 to BAL-29 ratings, requiring upgraded glazing, ember-resistant eaves, and non-combustible cladding, adding material cost at contract stage.
- Septic and effluent systems: Properties not connected to reticulated sewerage require on-site effluent disposal systems, which add both cost and council assessment complexity.
- Trades availability: Wollondilly Shire is not as trade-dense as Sydney's inner suburbs. Subcontractor travel time and mobilisation costs are real line items for builders in Thirlmere.
Use our build cost calculator for an indicative project estimate, or review current material prices to understand input cost trends before meeting with builders.
DA Approvals in Thirlmere, Wollondilly Shire Council
All development applications for Thirlmere properties are assessed by Wollondilly Shire Council via the NSW Planning Portal. The council's planning team evaluates DAs against the Wollondilly Local Environmental Plan (LEP) and Development Control Plan (DCP), alongside State Environmental Planning Policies (SEPPs) relevant to rural-residential, biodiversity, and bushfire-prone land.
Note: Median determination days for Wollondilly Shire Council are not available in the current data pack. This figure will be published when council performance data is confirmed. Track real-time Thirlmere DA activity by signing up for free DA alerts.
What Typically Slows DA Approval in Wollondilly Shire
- Incomplete submissions: Missing a Statement of Environmental Effects, inadequate bushfire report, or absent biodiversity assessment are the most common triggers for Request for Information (RFI) delays.
- Bushfire-prone land referrals: Applications on land mapped as bushfire-prone may require referral to the NSW Rural Fire Service, adding weeks to the assessment timeline.
- Biodiversity and heritage: Properties near creek corridors or mapped biodiversity values require additional ecological assessment, which adds pre-lodgement preparation time.
- Neighbour notification periods: Standard neighbour notification runs 14-21 days and cannot be shortened, forming a fixed minimum in the timeline.
Engaging a builder or architect familiar with Wollondilly Shire Council requirements before lodgement significantly reduces RFI risk. Browse the Thirlmere professional directory to find DA-experienced architects and building designers in your area.
Thirlmere Project Type Comparison
| Project Type | Indicative Cost Range | Typical Approval Pathway | Notes |
|---|---|---|---|
| New Detached Dwelling (standard finish) | Indicative, obtain builder quote | DA via Wollondilly Shire Council | BAL rating and site slope are key cost variables; bushfire report likely required |
| Home Extension / Renovation | Indicative, obtain builder quote | DA or Complying Development Certificate (CDC) | CDC pathway available for eligible extensions; check Wollondilly DCP setback controls |
| Secondary Dwelling (Granny Flat) | Indicative, obtain builder quote | CDC (if SEPP-compliant) or DA | Lot size and zoning determine CDC eligibility; effluent capacity a key constraint on unsewered lots |
| Dual Occupancy | Indicative, obtain builder quote | DA via Wollondilly Shire Council | Zone and minimum lot size checks essential before design commences |
| Shed / Rural Outbuilding | Indicative, obtain builder quote | Exempt, CDC, or DA depending on size | Exempt development thresholds apply; confirm with council before commencing |
All cost ranges are indicative only. Specific figures are not available in the current data pack and will be published when confirmed. Use the build cost calculator for a project-specific estimate.
Building in Thirlmere, Local Considerations
Thirlmere's character sits at the intersection of rural lifestyle and emerging suburban growth. The suburb feeds into Thirlmere Public School, which has an enrolment of 401 students (ACARA, current year), a signal of the young-family demographic driving residential construction demand. Builders working in the 2572 postcode should understand how this demographic shapes project briefs: functional family floor plans, outdoor entertaining space, and practical finishes tend to take priority over architectural statement builds.
The transition zones between Thirlmere, Wilton, and Picton are subject to active rezoning and infrastructure investment under the broader Wilton Growth Area framework. Landholders in and around Thirlmere should monitor planning scheme changes closely, as rezoning can alter what is permissible on a given lot. Subscribe to DA alerts to stay informed as new applications are lodged in your area.
For broader guidance on the construction process in regional NSW, visit our construction guides library.
Ready to move forward? Find builders and architects covering Thirlmere in the professional directory, or sign up below for free DA alerts so you never miss a new development application in your suburb.