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The 6 best renovation builders in Darwin

Darwin builders who handle extensions, renovations and structural work on existing homes in cyclone country. We checked every builder's registration on the NT register of building practitioners.

Updated October 2026.

Builders listed
6
Licences confirmed on the register
6 of 6
Average Google rating
4.6
Google reviews, combined
27
Builders paying to be here
None
  • LicenceA current Building Practitioners Board builder licence, matched to the business.
  • ReputationIndependent reviews, awards and years trading.
  • Right kind of workExtensions and renovations of existing Top End homes shown on their own site.
  • No paid placesNobody pays to be listed or to move up.

Renovation builders in Darwin, ranked

These registered Darwin builders show renovation and extension work on their own sites, and are ranked on fit for that work, reputation and track record.

  1. 1

    Forrest Building Co.

    Woolner. Darwin, Palmerston and the wider Northern Territory

    5.0 from 9 Google reviews

    Best for award-winning renovations and extensions with the principal builder

    • Won 2021 HIA NT Renovation/Addition Project of the Year for its Fannie Bay project.
    • Clients deal directly with principal builder Jack Forrest, according to the firm.
    • Builder registration number and ABN are printed on every page of its website.
    • Registered with the NT Building Practitioners Board continuously since 2012.
    NT builder registration
    156614CR Checked
    Building since
    2012
    Builds
    Extensions, Renovations, Granny flats, Custom homes, Fitouts
    Member of
    HIA, CAL accredited
    More about Forrest Building Co.

    Forrest Building Co. is a family-run Darwin builder established in 2012 and led by principal builder Jack Forrest. Its residential work covers renovations, extensions, granny flats and new homes, alongside commercial builds and fitouts.

    The firm says it helps clients from early planning and design through to completion, keeps costs transparent and reports changes promptly. Its Fannie Bay renovation won four 2021 HIA Northern Territory awards, including Renovation/Addition Project of the Year and Home of the Year. It is an HIA member and CAL accredited, according to its website.

    Awards: 2021 HIA Northern Territory Housing Awards: Renovation/Addition Project, winner (Fannie Bay); 2021 HIA Northern Territory Housing Awards: Home of the Year and Bathroom of the Year, winner; 2017 HIA Northern Territory Housing Awards: Home of the Year and Custom Built Home, winner (according to the firm)

    0458 581 797Visit website
  2. 2

    DN Building

    Winnellie. Darwin and rural areas including Humpty Doo

    5.0 from 4 Google reviews

    Best for transforming elevated and ex-commission Darwin houses

    • Specialises in renovating elevated and ex-commission houses built before Cyclone Tracy.
    • Won the 2016 HIA NT Renovation/Addition Project of the Year for a Parap project.
    • Owner David Neal manages each job himself, with a permanent in-house team.
    • Publishes its builder registration and HIA membership numbers on its contact page.
    NT builder registration
    160325CR Checked
    Building since
    2011
    Builds
    Elevated house renovations, Extensions, Ex-commission homes, Custom homes
    Member of
    HIA
    More about DN Building

    DN Building is a family business started by David Neal in 2011 after five years as a foreman with another Darwin builder. It works mainly on renovations and extensions to classic Darwin elevated houses and ex-commission homes, and also builds new tropical homes.

    According to the firm, David handles the whole job from first consultation, drafting and engineering through to inspections and certificates, using a permanent crew of qualified builders and apprentices and a regular group of local subcontractors. Projects on its website include a Troppo Architects designed extension in Rapid Creek and a rural extension in Humpty Doo.

    Awards: 2016 HIA Northern Territory Housing Awards: Renovation/Addition Project of the Year, winner (according to the firm)

    0407 314 345Visit website
  3. 3

    Primus Build

    Berrimah. Darwin's northern suburbs, Darwin River and surrounds

    5.0 from 1 Google reviews

    Best for large whole-house renovations in Darwin's northern suburbs

    • Won the 2026 Master Builders NT award for Residential Alteration over $1 million.
    • Also won 2026 Master Builders NT Bathroom Design over $25,000.
    • Its project gallery includes extensions and renovations in Rapid Creek, Nightcliff and Ludmilla.
    • Handles insurance repair and make-safe work as well as planned renovations.
    NT builder registration
    258135CR Checked
    Building since
    2017
    Builds
    Renovations, Extensions, Insurance repairs, New homes
    More about Primus Build

    Primus Build is a locally owned Berrimah builder whose residential work centres on renovations and extensions, with new elevated homes, bathroom and kitchen upgrades and insurance repair work also listed on its website. The company was registered in late 2017.

    Its project gallery includes verandah extensions turned into kitchen and living areas in Rapid Creek, a new three bedroom home joined to an existing house, and full renovations in Ludmilla. The firm says it can work in occupied homes and sites and manage staged programs from start to finish. Its Rapid Creek renovation won a 2026 Master Builders NT award.

    Awards: 2026 Master Builders NT Excellence in Building and Construction Awards: Residential Alteration over $1 million, winner (Rapid Creek Renovation); 2026 Master Builders NT Excellence in Building and Construction Awards: Bathroom Design over $25,000, winner

    08 8911 1253Visit website

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  5. 4

    Xtreme Build

    Palmerston. The Top End

    Best for family home additions and full renovations

    • Won the 2023 HIA NT Renovation/Addition Project of the Year.
    • Client reviews on its website describe a full house renovation finished in two months.
    • Offers support from design to completion, the firm says, and client reviews mention direct contact with owner Zeb Young.
    NT builder registration
    298155CR Checked
    Building since
    2018
    Builds
    Renovations, Extensions, Granny flats, Custom homes
    More about Xtreme Build

    Xtreme Build is a Territory-owned builder run by Zeb Young, delivering renovations, extensions, new custom homes and some commercial and shed work across the Top End. The firm says its team has fifteen years of experience in residential and commercial construction.

    Its 2023 HIA award-winning project turned a small house into a larger family home with two extra bedrooms, a study and a parents' retreat, opening the main living area to the garden. The firm offers support from design to completion, and client testimonials on its website mention clean sites and regular contact with the owner.

    Awards: 2023 HIA Northern Territory Housing Awards: Renovation/Addition Project, winner

    0448 078 309Visit website
  6. 5

    Housley Builders

    Coolalinga. Darwin, Virginia, Palmerston and rural NT

    5.0 from 1 Google reviews

    Best for extensions and renovations in Darwin's rural area

    • Family-owned and trading since 1993, according to the firm.
    • Based in Coolalinga with a focus on Virginia, Palmerston and rural blocks.
    • Uses 3D modelling so clients can see an alteration before work starts, the firm says.
    NT builder registration
    221368CR Checked
    Building since
    1993
    Builds
    Extensions, Renovations, Second storeys, Granny flats, Verandahs
    Member of
    HIA, Master Builders
    More about Housley Builders

    Housley Builders is a family-owned builder based at Coolalinga that says it has been operating since 1993. It covers Darwin, Virginia, Palmerston and the outlying rural area, building extensions, second storeys, granny flats, renovations and verandahs, along with new homes and some commercial work.

    The firm says it handles renovations from planning and design through to completion, and uses 3D modelling software so clients can review and adjust alteration plans before construction starts. It lists membership of the HIA and Master Builders on its website.

    0427 260 599Visit website
  7. 6

    M+J Builders

    Winnellie. Darwin, Alice Springs, Katherine and remote NT

    3.1 from 12 Google reviews

    Best for high-end apartment and home renovations

    • Won 2024 HIA NT Renovation/Addition Project of the Year, then a national finalist.
    • Holds an unrestricted residential registration, covering larger multi-storey residential work.
    • Majority Indigenous-owned Territory builder with CAL certification, according to its website.
    NT builder registration
    192511CU Checked
    Builds
    Apartment renovations, Renovations, Extensions, Custom homes
    Member of
    CAL
    More about M+J Builders

    M+J Builders is a majority Indigenous-owned Northern Territory builder that says it has been operating for more than 15 years. Most of its work is commercial, defence and government, but it runs a residential arm focused on high-end renovations and new homes.

    Recent residential projects on its website include a top-floor apartment renovation at Mantra Pandanas with DJK Architects and an apartment overhaul on Marina Boulevard, Cullen Bay. The firm describes a four-step process of consultation, design planning, material selection and regular updates. Its 1990s apartment renovation won the 2024 HIA Northern Territory Renovation/Addition Project award.

    Awards: 2024 HIA Northern Territory Housing Awards: Renovation/Addition Project, winner; 2025 HIA Australian Housing Awards finalist; 2023 HIA Northern Territory Housing Awards: Small Commercial Project, Specialised Housing and Townhouse/Villa of the Year, winner

    08 8998 9669Visit website

What a renovation costs in Darwin

Indicative 2026 figures. Darwin has no published city extension rate, so national guides fill the gap.

WorkTypical cost
Ground floor extension (national guide)$2,000 to $4,000 per sqm
Ground floor extension (Darwin guide, incl. GST)$2,500 to $5,000 per sqm
Second storey addition$1,850 to $3,500 per sqm, often $200,000 to $450,000
Kitchen renovation, mid-range$25,000 to $45,000
Bathroom renovation, mid-range$20,000 to $35,000
Demolition, house (QS rate, Darwin)$85 to $190 per sqm

Extension and second storey ranges are national hipages figures (January 2026), with What's The Damage's Darwin builder guide (October 2026) for comparison. Kitchen and bathroom totals are Darwin figures from What's The Damage, including GST. Demolition is RLB Riders Digest 2026 for Darwin, excluding GST and asbestos removal. All exclude land.

Permits for a Darwin renovation

In the NT a registered building certifier issues the building permit, and the rules catch more renovation work than many owners expect.

In NT building control areas, a registered building certifier grants the building permit. When the work is finished, the builder gives the certifier a builder's declaration. The NT Government says Tier 2 areas, outside the Darwin, Lake Bennett and Alice Springs regions, may need only part certification. In Darwin, expect full certification, including an occupancy certificate.

The NT Government's table of residential work says a building permit is required for:

  • Extensions or alterations that increase floor area
  • Alterations that don't increase floor area
  • Changing windows, reroofing or replacing sheeting
  • Bathrooms, where walls, fixtures or plumbing change

Some carports, sheds, pergolas and fences have exemptions, but check before you build.

Cyclone requirements

The National Construction Code marks parts of the NT as cyclone prone, and buildings there must meet specific wind resistance provisions. Your certifier will explain how your design has to meet them, so ask early what that means for new roof, wall or window work. If your land is in a storm surge or flooding overlay, planning approval may be needed as well.

NT rules that protect you

The NT's key protections start at $25,000, and they apply to extensions that add floor area.

  • Registration: prescribed building work on houses valued at $25,000 or more needs a registered building contractor (residential restricted or unrestricted). Renovations that don't add floor area, and sheds, garages or verandahs added after the house was built, aren't prescribed work, but the NT Government still recommends a contract. How to check a builder.
  • Contract: the NT Government lists a building contract as required for extensions or alterations that increase floor area, and it must include the builder's registration number.
  • Deposit: no more than 5% of the total contract price.
  • Progress payments: standard stages are up to 10% at base, 20% at frame, 25% at enclosed, 30% at fixing, 7% at practical completion and the balance at the final stage. The builder can only ask once a stage is complete.
  • Residential building cover: required for residential work of at least $25,000 on a house, including extensions. The builder must give you the policy or fidelity certificate before starting or asking for any payment. Minimum cover is $200,000 if the builder dies, disappears or becomes insolvent. How it works.

NT law sets no statutory cooling-off period for building contracts, so read the contract before you sign. On contract types, see fixed price or cost plus. For defects, a current owner can apply to the Commissioner of Residential Building Disputes; complaints about a builder's conduct go to the Building Practitioners Board.

Renovating in the Top End

Heat, wet season rain and cyclone rules shape what a Darwin renovation costs and when it can happen.

  • Plan around the wet. Ask each builder how they schedule roof work and opening up the house, and what happens to the timeline if a cyclone watch is issued mid job.
  • Expect cyclone work in the scope. Ask whether the quote includes the engineering and fixings your certifier will need to sign off new roof, wall or window work against the cyclone provisions.
  • Watch the $25,000 line. Registration and insurance rules apply to prescribed work of $25,000 or more. A big renovation that doesn't add floor area may sit outside them, so insist on a written contract anyway.
  • Check the sub-category. Residential restricted covers detached houses and attached dwellings up to 2 storeys; unrestricted covers any house or class 2 building.
  • Get the insurance document first. No policy or fidelity certificate, no deposit.

More in questions to ask a builder.

Checking an NT builder's registration

It takes a couple of minutes, and it's the same check we ran for every builder above.

  1. Search the public register

    Search the NT Public Register of Building Practitioners by name or registration number. NT Public Register of Building Practitioners

  2. Check registration is current

    The registration should be current on the day you sign, not just when you got the quote.

  3. Check the sub-category

    For a home you want building contractor residential (restricted), which covers houses and buildings up to 2 storeys, or residential (unrestricted). Commercial categories cover offices, shops and other non-residential buildings.

  4. Match the contract

    The registration number written into the residential building contract must match the register. NT Government: check if your builder is registered

How we chose these builders

We started from builders working across Darwin, then kept only those with a current Building Practitioners Board licence, a clear record of renovation work on their own site, and a solid independent reputation. Order weighs fit for this kind of project, reviews and awards, years trading, and how openly each builder explains its process, licence and warranty. Size and advertising spend don't count.

No builder pays to be listed or ranked. If you request quotes through this page, we pass your project to builders that suit it. Read the full method.

Renovation builders in Darwin: common questions

How much does a home extension cost in Darwin?

National guides put a ground floor extension at $2,000 to $4,000 per square metre, and a Darwin builder cost guide gives $2,500 to $5,000 per square metre including GST, typically about $3,500. Cyclone engineering can add to that. Land isn't included.

Do I need a building permit to renovate in Darwin?

Usually yes. The NT Government lists a permit as required for extensions, for alterations even without extra floor area, for changing windows or reroofing, and for bathrooms where walls, fixtures or plumbing change. A registered building certifier issues it.

Does a renovation in Darwin have to meet cyclone standards?

Yes. The National Construction Code marks parts of the NT as cyclone prone, with specific wind resistance provisions, and all buildings in building control areas must comply with the code. Your certifier will tell you what your design needs.

When does a Darwin renovation need a registered builder?

For prescribed residential building work valued at $25,000 or more, which includes extensions that add floor area. Renovations that don't add floor area aren't prescribed work, but you should still use a written contract.

How much deposit can a builder take in the NT?

No more than 5% of the total contract price. Progress payments after that follow set stages, and a builder can only ask once a stage is complete.

How much does a bathroom renovation cost in Darwin?

A mid-range bathroom renovation in Darwin costs about $20,000 to $35,000 including GST, with $27,000 typical. Budget jobs start around $10,000 and luxury bathrooms reach $55,000 or more.

This list is a guide only. Check the builder's licence, insurance and contract yourself before you sign.