Do I need Northern Beaches Council DA for my Mona Vale extension?

Depends on scope. Rear ground-floor extensions often qualify for CDC (15-day approval); second-storey additions and anything breaching FSR/height triggers DA through Northern Beaches Council (40–60 days). Buildana checks the DCP envelope at concept stage and picks the pathway that saves time and fits the design.

Do I need Northern Beaches Council approval for a home extension in Mona Vale?

Most home extensions in Mona Vale require approval — either DA through Northern Beaches Council (40–90+ days) or CDC through a private certifier (10–15 business days for eligible designs). Small exempt developments under 20m² may not require approval. Buildana assesses your project and recommends the best pathway.

Is it better to extend or knockdown rebuild in Mona Vale?

For 1920s–1960s heritage + apartments + premium contemporary-era homes in Mona Vale: if you need 30–60m² more space and the existing structure is sound, extension is usually more cost-effective ($150K–$300K vs $450K+ KDR). If you need a complete redesign or the existing home has major structural or asbestos issues, KDR may deliver better value. Use our renovation vs KDR calculator for a personalised comparison.

How far can I extend at the rear of my Mona Vale home?

Rear extensions need 900mm minimum setback to the rear boundary under CDC, or as specified in Northern Beaches Council's DCP. On 450–800m² blocks in Mona Vale, you can typically extend 3–6 metres past the existing rear wall while maintaining compliant setbacks, private open space, and solar access to neighbours. Buildana calculates the maximum achievable footprint during the design consultation.

Can I extend and renovate at the same time in Mona Vale?

Yes — and it's usually cheaper to do both together. One DA or CDC covers both scopes, one builder mobilisation, one project timeline. Buildana's fixed-price contracts for combined extension-renovation cover the full scope: new construction plus renovation of existing rooms (kitchen, bathrooms, flooring, painting, electrical). Saves 10–15% versus doing them as separate projects.

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Home Extension Builder Mona Vale — From $150K Fixed Price

Q: What's the most popular type of extension in Mona Vale?

In Mona Vale, the most common extension is a rear ground-floor addition that opens up kitchen, dining, and living into one space — typically 30–50m² of new floor area. 1920s–1960s heritage + apartments + premium contemporary-era homes here usually have separate rooms that don't connect well. A rear extension with sliding doors to the yard transforms how the house works day-to-day.

Fixed-price home extensions in Mona Vale 2103. Rear extension $150K–$300K, second storey $300K–$500K. Northern Beaches Council approvals managed. Free site consult.

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Mona Vale Home Extensions — Fixed Price

Extension in Mona Vale runs 450–800m² with HCAs on older streets — Federation/inter-war additions, sandstone rock excavation, Coastal Hazard on beachfront. Realistic budget $400K–$900K (heritage); $700K–$1.5M premium oceanfront.

Mona Vale's housing stock is mostly from the 1920s–1960s heritage + apartments + premium contemporary, which is the era where structural bones either hold up or don't — and we see plenty of both across the suburb. For extending here, that history matters: asbestos survey before any demolition is non-negotiable, and licensed removal lands somewhere between $5,000 and $25,000 depending on what's actually there. Median price $2.6M–$5M+ (oceanfront) on typical 450–800m² blocks. Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts ground, foundation cost band $45,000–$80,000.

Buildana manages the complete home extension process in Mona Vale — from design consultation and structural engineering through to DA or CDC approval, and fixed-price construction to handover. Extend your home without the stress.

Read our Home Extension Cost Guide 2026 or explore extension approval pathways in NSW.

Home extensions in Mona Vale from $150K
Northern Beaches Council DA and CDC approvals managed
Ground floor, rear and second-storey additions
Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts soil — structural engineering included
1920s–1960s heritage + apartments + premium contemporary-era homes assessed for extension suitability
Connect new to existing — clean, matched finish
6-year structural warranty
Free design consultation — near B-Line bus to CBD (Mona Vale interchange + terminus) station

Why Extend Your Home in Mona Vale?

Mona Vale is the Northern Beaches' commercial and B-Line interchange hub — Federation beach houses, inter-war heritage, post-war brick and contemporary on 450–800m² blocks. R3/R4 around the town centre and B-Line interchange. Coastal Hazard zone on direct beachfront. Mona Vale Hospital site. Hawkesbury Sandstone with rock excavation $40K–$120K typical. Heritage Conservation Areas across the older streets.

Mona Vale's rural-residential character and 450–800m² blocks set it apart from standard suburban development. R2 Low / R3 Medium (Manly, Dee Why, Brookvale, Mona Vale, Avalon town centres) / RU2 Rural Landscape (Ingleside, Terrey Hills, Duffys Forest, Oxford Falls) / E3/E4 Environmental on bushland fringe zoning means different controls apply — larger setbacks, on-site services, and site-specific engineering. Transport access via B-Line bus to CBD (Mona Vale interchange + terminus) connects Mona Vale to the wider Sydney network. 1920s–1960s heritage + apartments + premium contemporary-era homes in Mona Vale often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts soil (extremely reactive) is standard for Mona Vale — Buildana includes engineered slab design in every quote.

Extension is the dominant scope across most of the heritage-protected Northern Beaches village cores given heritage controls and tight 350–700m² lots — Manly, Fairlight, Balgowlah, Balgowlah Heights, Clontarf, Seaforth, Avalon, Bilgola Beach, Bilgola Plateau, Newport, Mona Vale, Collaroy, Narrabeen, Curl Curl, Freshwater, Whale Beach, Palm Beach village cores all extension-restricted territory. Federation cottage rear additions, inter-war heritage extensions, Sydney School modernist additions (Avalon/Bilgola/Whale Beach), beach-house heritage-grade work, harbour-fall heritage-grade work, Pittwater-fall heritage-grade work all common scope. Hawkesbury Sandstone rock excavation $30K–$120K on second-storey/footing-strengthening work; Class P/E alluvial soil and dewatering on lagoon-margin extensions (Narrabeen, Dee Why, Curl Curl, Manly, Mona Vale lagoon corridors). Coastal Hazard zones drive coastal-engineering reports on direct oceanfront extensions. Salt-grade specs standard on coastal-facing extensions. Bushfire-prone overlays drive specs on bushland-fringe extensions exceeding 50% original floor area — BAL-29 minimum on most acreage; sprinklered eaves and non-combustible cladding upgrades on BAL-FZ. RFS Bushfire Protection Assessment routine. Heritage Council expects retention of stained glass, timber lining boards, beach-house weatherboard cladding, slate/terracotta roofing, sandstone walling on protected streets. Tree Preservation Order strict — AS4970 root-zone protection plans routine. Acreage extensions at Ingleside, Terrey Hills, Duffys Forest, Oxford Falls run premium homestead-grade work with RFS BPA, AWTS reconfiguration. Apartment renovations on Manly Corso, Dee Why, Mona Vale, Brookvale, Wolli Creek-equivalent town-centre stock — restricted by strata bylaws, common-property approval. Realistic budget $300K–$700K for thoughtful 60–130m² addition on inland mid-tier; $500K–$1.2M on premium suburban (Balgowlah, Forestville, Frenchs Forest); $800K–$2.5M premium oceanfront/harbour-front heritage-grade work on Manly/Clontarf/Seaforth/Avalon/Newport; $1.2M–$3.5M+ heritage-grade Sydney School/Federation restoration on Palm Beach/Whale Beach/Bilgola Beach/Avalon Beach direct waterfront; $400K–$1.2M on RU2 acreage homestead extension; $200K–$500K apartment-scale.

Planning Controls — Northern Beaches Council

Northern Beaches LEP 2022 (consolidating the legacy Manly, Warringah and Pittwater LEPs) & Northern Beaches DCP. Post-2016 amalgamation LGA spanning the entire ocean-and-harbour peninsula from North Head to Barrenjoey — 252 km² with 36+ residential suburbs, four lagoons, the Garigal and Ku-ring-gai Chase National Parks, and the Pittwater estuary. R2 Low Density covers most residential streets: FSR 0.5–0.55:1, building height 8.5–9m, front setback 6–7.5m, landscaped area 40–60%, deep soil 25–35%. R3 Medium Density along Pittwater Road and around station precincts (no rail — B-Line bus equivalents at Manly, Brookvale, Dee Why, Collaroy, Narrabeen, Mona Vale interchange/terminus) permits FSR up to 0.9:1. R4 High Density and B4 Mixed Use concentrated on Manly town centre + the Corso, Dee Why town centre, Brookvale, Mona Vale town centre, Avalon village core. Northern Beaches DCP duplex minimum lot varies by precinct — 600m² (legacy Manly + Pittwater R2) to 700m² (legacy Warringah R2). RU2 Rural Landscape covers the rural acreage belt — Ingleside, Terrey Hills, Duffys Forest, Oxford Falls, parts of Belrose — restricting subdivision to 2ha+ minimum. E3 Environmental Management and E4 Environmental Living overlays on bushland-fringe lots backing Garigal NP, Ku-ring-gai Chase NP, Manly Dam Reserve and Narrabeen Lagoon catchment further restrict siting. Heritage Conservation Areas extensive — Manly heritage core (the Corso, Eastern Hill, North Head precinct), Fairlight, Balgowlah, Balgowlah Heights, Clontarf, Seaforth, Avalon village, Newport village, Mona Vale, Bilgola Beach cove, Whale Beach, Palm Beach village, Freshwater village (Duke Kahanamoku surfing precinct), Curl Curl heritage streets, Collaroy village, Narrabeen heritage streets. Aboriginal cultural heritage protocols apply across most sandstone country (extensive rock-art sites, middens, engravings) — pre-DA Aboriginal Cultural Heritage Assessment routine on bushland-fringe and waterfront sites. Tree Preservation Order LGA-wide and strict — Northern Beaches retains the most extensive remnant bushland of any Sydney LGA. Hawkesbury Sandstone soil predominant — deep rock excavation $40K–$200K+ is LGA-defining (the most rock-excavation territory of any Sydney LGA on a per-build basis). Class P/E coastal alluvial on Narrabeen Lagoon, Curl Curl Lagoon, Dee Why Lagoon, Manly Lagoon and Mona Vale Lagoon corridors — suspended slab + Class P/E footing engineering and dewatering required. Coastal acid sulphate soils (CASS) on lagoon margins drive specialist dewatering and acid neutralisation protocols. Coastal Hazard zones are LGA-defining — coastal erosion line affects Pittwater Road oceanfront properties at Collaroy, Narrabeen, Curl Curl, Dee Why, Mona Vale, Palm Beach (2016 storm event reset baselines on Collaroy/Narrabeen specifically; multiple oceanfront properties since required Council coastal-hazard reports for any DA). Bushfire-prone land overlays are LGA-defining — BAL ratings BAL-12.5 to BAL-FZ across virtually all bushland-fringe lots (Belrose, Davidson, Killarney Heights, Frenchs Forest, Forestville, Beacon Hill, Cromer, Allambie Heights, Oxford Falls, Terrey Hills, Duffys Forest, Ingleside, Bayview, Church Point, Avalon, Bilgola Plateau, Whale Beach, Palm Beach, Clareville, Newport bushland-fringe). RFS Bushfire Protection Assessment routine — non-combustible cladding, ember-screened openings, sprinklered eaves on BAL-FZ, Asset Protection Zone (APZ) 10–40m+ on most acreage. AWTS on-site sewer mandatory on RU2 acreage belt (no reticulated sewer on Ingleside/Terrey Hills/Duffys Forest/Oxford Falls). Sydney Drinking Water Catchment overlay on parts of Ingleside, Terrey Hills, Duffys Forest western edges and Pittwater foreshore — restricts AWTS dispersal field siting and adds NSW Health/WaterNSW referral. Riparian setbacks 10–60m on Narrabeen Lagoon, Curl Curl Lagoon, Dee Why Lagoon, Manly Lagoon, Mona Vale Lagoon, Pittwater foreshore, Cowan Creek tributaries, Middle Harbour and North Harbour. Foreshore Building Line restrictions on direct waterfront across Pittwater (Bayview, Church Point, Clareville, Avalon, Newport), Middle Harbour (Clontarf, Seaforth, Balgowlah Heights), North Harbour (Fairlight, Balgowlah Heights) and ocean cliffs (Manly, Freshwater, Curl Curl, Narrabeen, Mona Vale, Newport, Bilgola, Avalon, Whale Beach, Palm Beach). The LGA has no rail — B-Line bus is the primary spine (Mona Vale terminus through Warringah Mall Brookvale interchange to CBD via Mosman). Beaches Link Tunnel (under construction, opening 2028) is the LGA-defining infrastructure event — twin tunnels under Middle Harbour connecting Cammeray to Balgowlah/Seaforth with portals reshaping traffic and property values across Balgowlah, Balgowlah Heights, Seaforth, Manly Vale and Manly. Northern Beaches Hospital (opened 2018, Frenchs Forest) anchors LGA medical employment and drives granny flat hospital-staff demand on Frenchs Forest, Davidson, Allambie Heights, Forestville, Belrose. Manly Hospital site redevelopment under master plan. Mona Vale Hospital site (Northern Beaches Hospital amalgamation legacy) under redevelopment. Warriewood Valley Release Area is the LGA's only active master-planned new-release on R3/R4 medium-density 300–600m² lots. Ingleside Precinct master-plan rezoning (originally proposed for ~3,400 dwellings) under review/paused. The Corso, Manly is the heritage retail spine. Avalon, Newport, Mona Vale, Collaroy, Dee Why, Brookvale and Manly are the primary commercial centres. Premium clifftop ocean-view properties at Manly, Freshwater, Curl Curl, Avalon, Bilgola, Whale Beach, Palm Beach are among Australia's most expensive residential markets ($8M–$30M+ on Palm Beach alone).

Home extension builder in Mona Vale — key facts

Suburb: Mona Vale, NSW 2103
Council / LGA: Northern Beaches Council (Northern Beaches)
Primary zoning: R2 Low / R3 Medium (Manly, Dee Why, Brookvale, Mona Vale, Avalon town centres) / RU2 Rural Landscape (Ingleside, Terrey Hills, Duffys Forest, Oxford Falls) / E3/E4 Environmental on bushland fringe
Typical lot size: 450–800m²
Soil class: Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts
Median house price: $2.6M–$5M+ (oceanfront)
Home era: 1920s–1960s heritage + apartments + premium contemporary
Typical price range: $150,000 – $600,000+
Typical timeline: 6–12 months design to handover
Approval pathway: CDC for most rear extensions, DA for second-storey

Building in Mona Vale — Local Context

Ground Conditions That Affect Your Build

Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts is the rule across Mona Vale — extremely reactive clay. For your home extension, expect engineered footings in the $45,000–$80,000 range. The variables that shift you up or down inside that band: building footprint, number of storeys, point loads (heavy stone benchtops, masonry feature walls), and whether the adjacent stormwater system needs upgrading. Mona Vale is close to B-Line bus to CBD (Mona Vale interchange + terminus) station — site access on tighter blocks adds a logistics premium, which is why we cost cranage and material delivery before signing, not after.

Northern Beaches Planning Context

Northern Beaches has its own LEP and DCP layered over State planning controls. For extending in Mona Vale, the practical impact: Northern Beaches Council's DCP sets local rules for streetscape character, materials palette in some precincts, vehicle crossover widths, and tree retention. R2 Low / R3 Medium (Manly, Dee Why, Brookvale, Mona Vale, Avalon town centres) / RU2 Rural Landscape (Ingleside, Terrey Hills, Duffys Forest, Oxford Falls) / E3/E4 Environmental on bushland fringe zoning on most Mona Vale blocks permits single dwellings, alterations, and additions. Buildana checks every overlay (heritage, bushfire, flood, acid sulfate soil, biodiversity) before quoting.

What a Extension Costs in Mona Vale

Mona Vale's median house price sits at $2.6M–$5M+ (oceanfront). That's the number that decides whether a home extension stacks up financially. If you're spending more than 50% of $2.6M–$5M+ (oceanfront) on a extension, the economics tilt toward knockdown rebuild instead. Worth running the numbers properly before locking in scope. Buildana provides itemised quotes — no provisional sums, no allowances, no "as per engineering" line items.

Lifestyle Fit in Mona Vale

Mona Vale has a settled residential character. B-Line bus to CBD (Mona Vale interchange + terminus) station is the rail anchor for the suburb. Local landmark: Mona Vale Beach + Mona Vale Hospital + Mona Vale town centre + B-Line terminus. For families extending here, the design considerations that matter day-to-day: orientation for natural light (north-facing living wherever the lot allows), separation between adult and kids' zones, a kitchen that opens to outdoor entertaining, garage size that fits a real family vehicle plus storage, and a layout that doesn't require renovating again in 10 years as the kids grow. Buildana designs for the long arc of how families actually use a home, not just the showroom photo.

Northern Beaches Council Processing & Mona Vale Activity

Northern Beaches Council processes thousands of residential applications a year across the Northern Beaches LGA, and Mona Vale (2103) sits in the active end of that workload. For a home extension, the realistic clock from lodgement to DA determination is 8-14 weeks. The applications that move to the front of the queue are the ones where every required document is correctly named, drawn to scale, and matched against the SEPP or LEP clause it's claiming compliance with. Buildana lodges every project at that standard — not because it's required, but because it's how you avoid sitting in the RFI loop for an extra month.

Builder's Take on Mona Vale

Existing-structure assessment is the non-negotiable first step. Mona Vale 1920s–1960s heritage + apartments + premium contemporary homes often have undersized footings or termite-damaged wall plates that won't carry a second storey. We check with drilled inspections before quoting — no point designing a dream that's not structurally viable.

Second storey on a Mona Vale home: the existing single-storey footings usually need reinforcement, which adds $15K–$40K. The roof comes off. The house is exposed for 4–8 weeks (weatherproofed nightly). Clients often underestimate the disruption — but the result is a doubling of floor area for 50% of the cost of a rebuild.

Mona Vale vs Nearby Suburbs

Mona Vale vs nearby suburbs — key metrics for extending.

Suburb	Median Price	Typical Lot	Soil Class	Era	Station
Mona Vale2103this suburb	$2.6M–$5M+ (oceanfront)	450–800m²	Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts	1920s–1960s heritage + apartments + premium contemporary	B-Line bus to CBD (Mona Vale interchange + terminus)
Bayview2104	$3.5M–$10M+ (waterfront)	800–2,000m²	Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts	1920s–1970s + premium contemporary	B-Line bus to CBD via Mona Vale
Newport2106	$2.8M–$6M+ (oceanfront/Pittwater)	450–1,200m²	Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts	1920s–1960s heritage + premium contemporary	B-Line bus to CBD (Mona Vale interchange)
Warriewood2102	$2.4M–$5M+ (oceanfront)	300–800m² (master-planned + original)	Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts	1920s–1960s heritage + 2010s+ master-planned + premium contemporary	B-Line bus to CBD (Mona Vale interchange)

Median price, soil class, and lot size shape build feasibility and final cost. Buildana assesses every site against these and other constraints during the free feasibility stage.

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Quality Promise

Every Buildana home extension in Mona Vale is delivered under a fixed-price contract — from design consultation through to defect-free handover.

Fixed-price extension constructionNCC 2025 and BASIX compliantFull Northern Beaches Council complianceMatched old-to-new connectionWeekly progress updates6-year structural warranty

How It Works

From First Call to Final Key

Everything that has to be right before we touch the ground. Walk through your Mona Vale home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure. The cost estimate that follows is grounded in what we found, not a generic per-m² number. Our designer works with your existing home's layout — connecting new living areas to existing rooms, matching materials and roof pitch, and maximising natural light. You approve floor plans and 3D renders before we proceed.

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The Mona Vale construction phase. Fixed price, programmed, supervised. Most rear extensions in Mona Vale qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Northern Beaches Council because of overshadowing and privacy assessments. We choose based on your design, not on what's easier to lodge. Extension built from new footings to completion — connecting structurally to your existing home. Class Hawkesbury Sandstone predominant (deep rock excavation $40K–$150K+ on most lots) / Class P/E coastal alluvial on Narrabeen/Curl Curl/Dee Why/Manly/Mona Vale lagoon corridors / coastal acid sulphate soils (CASS) on lagoon margins / coastal hazard zones on Collaroy–Narrabeen, Curl Curl, Dee Why, Manly, Mona Vale, Palm Beach beachfronts soil design managed. Temporary weatherproofing maintains liveability where possible.

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The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Walk through the completed extension, confirm finishes, collect your OC. Six-year structural warranty covers all new work including the junction with your existing home. Maintenance guide provided.

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Our Team

Oliver Alameri

Founder / Director / Builder · MPropDev · PhD Student

Ahmad Alameri

Accounts Manager

Claire Wendell

Project Manager

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Last updated: 1 April 2026

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