Renovated weatherboard cottage with a white gable front, blue front door and new timber entry deck

Builder & designer · Cronulla, Sutherland Shire

Builders & renovators in Cronulla & the Sutherland Shire.

Renovations, extensions, second storeys, decks and custom joinery, designed and built by a local Cronulla builder with more than 20 years’ experience.

Get a free quote Call 0418 219 759

20+ years of building experience
Licensed & insured · Lic. 464683C
Master Builders NSW member
Design & build · one point of contact

About us

Whether it’s a new deck or a whole new level, it should be designed properly and built to last.

JN Building Design is a licensed building and design company based in Cronulla, with more than 20 years of experience. We specialise in bathroom, kitchen and laundry renovations, home extensions and alterations, second-storey additions, decks and outdoor living, and custom joinery across the Sutherland Shire, the Eastern Suburbs and the Inner West.

Because we design as well as build, you can come to us with an idea, a rough sketch or a full set of plans. We’ll talk it through honestly, tell you what’s possible and give you a clear quote before any work starts.

Services

Seven ways we can help.

Choose a service to see what’s involved.

Renovated bathroom with a timber wall-hung vanity, oval backlit mirror and large pale floor tiles

Bathroom & Laundry Renovations

A bathroom or laundry that works properly, looks good and is easy to keep clean.

Complete bathroom and laundry renovations
Waterproofing and tiling
Built-in storage, vanities and fittings to suit your style

Modern kitchen with a stone island bench, timber-look overhead cupboards and built-in fridge

Kitchen Renovations

A kitchen built around the way your household cooks, eats and gets together.

Islands for extra bench space and storage
Walls opened up for a more open layout, where the structure allows
Walk-in pantries and smarter storage

Rear extension in white painted brick with black-framed doors opening onto a new deck and pergola

Home Extensions & Alterations

Outgrown the house but love the street? Extend instead of moving.

Extra bedrooms, bathrooms and living areas
Alterations that rework the rooms you already have
Framing, carpentry and internal fit-out

Tall home extension clad in black vertical boards, with an outdoor seating area in front

Second-Storey Additions

No room to build out? Build up.

New bedrooms and bathrooms upstairs
Extending an existing upper floor
A good option when your block or neighbours limit building outwards

Covered timber rear deck and alfresco dining area with steps down to the lawn

Decks & Outdoor Living

Outdoor spaces made for Shire summers: barbecues, long lunches and lazy afternoons.

Decks built to suit your home and your block
Pergolas and covered outdoor areas
Outdoor kitchens with built-in barbecues

Open-plan living and dining room with timber floors, a leather sofa and sliding doors to a balcony

Home Design

Got an idea but not sure where to start? We’ll turn it into plans you can build from.

Design ideas for makeovers, renovations and additions
Plans talked through with you before any work starts
Design and build with one company, so the plans stay practical

Bedroom with floor-to-ceiling built-in timber wardrobes beside a feature wallpaper wall

Custom Joinery

Joinery made to fit your home and the way you use it.

Wet bars for entertaining
Butler’s pantries
Built-ins: wardrobes, shelving and storage

Recent work

Our projects

A few recent renovations, extensions and decks from around Sydney.

Open-plan kitchen, dining and living area with herringbone timber floors and a round dining table — Kitchen & living · herringbone timber floors

White bathroom with a double vanity, round mirrors and vertical panelled walls — Bathroom · double vanity

Kitchen island bench with an undermount sink and timber-look cabinetry behind — Kitchen · island bench

Rear deck with a covered alfresco area and outdoor dining setting — Rear deck & alfresco

White brick rear extension with a pergola and deck stepping down to the garden — Extension & deck · white brick

Bedroom with a VJ panelled feature wall and upholstered bedhead — Bedroom · VJ panelling

Timber courtyard deck wrapping a lawn beside a white rendered extension — Courtyard deck

Extension clad in black vertical boards with an outdoor seating area — Extension · black vertical cladding

Bathroom with a timber vanity, backlit oval mirror and walk-in shower — Bathroom · timber vanity

View the full gallery See more on Instagram

Light-filled dining area beneath a double-height void with a black steel balustrade

Built in the Shire.

Why JN Building Design

Local, hands-on & straight-talking.

We’re based in Cronulla and have been building for more than 20 years, so our reputation is built one job and one street at a time. You get honest advice on what’s worth doing, a builder who designs as well as builds, and one point of contact from the first plans to the final walk-through.

20+ years’ experience: Renovating and extending homes for over two decades
Licensed & insured: Builder’s Licence No. 464683C
Master Builders NSW: Proud member of Master Builders NSW
Design & build: From first plans through to handover
Sydney office: Level 12, 95 Pitt St, Sydney NSW 2000
Six days a week: Mon–Sat, 7am–5pm

From first chat to final walk-through

01
Have a chat
Call 0418 219 759 or send an enquiry. Tell us what you’d like to do and roughly what you’d like to spend.
02
Plans & quote
We look at the site, work through the design with you and give you a clear quote before anything starts.
03
Build
We get to work, coordinate the trades and keep you updated along the way.
04
Handover
A final walk-through together, so everything is finished the way you wanted it.

Service areas

Building across the Shire, the East & Inner West.

Based in Cronulla, we work right across the Sutherland Shire, Sydney’s Eastern Suburbs and the Inner West. Not sure if we cover your suburb? Just give us a call on 0418 219 759.

Sutherland Shire

Alfords Point, Bangor, Barden Ridge, Bonnet Bay, Bundeena, Burraneer, Caravan Head, Caringbah, Como, Cronulla, Dolans Bay, Elouera, Engadine, Grays Point, Greenhills Beach, Gymea, Gymea Bay, Heathcote, Illawong, Jannali, Kangaroo Point, Kareela, Kirrawee, Kurnell, Lilli Pilli, Loftus, Lucas Heights, Maianbar, Menai, Miranda, Oyster Bay, Port Hacking, Sandy Point, Sutherland, Sylvania, Sylvania Waters, Taren Point, Wanda, Waterfall, Woolooware, Woronora, Woronora Heights, Yarrawarrah and Yowie Bay.

Eastern Suburbs

Bathroom and kitchen renovations, extensions, decks and custom joinery for homes across Sydney’s Eastern Suburbs.

Inner West

Renovations, alterations, second-storey additions and joinery for Inner West homes, from cottages to semis.

Get a free quote

Let’s talk about your project.

The quickest way to reach us is a phone call. Prefer to write? Send us the details through our contact page and we’ll get back to you.

0418 219 759
jnbuildingdesign@gmail.com
Mon–Sat, 7am–5pm
Level 12, 95 Pitt St, Sydney NSW 2000

Ready to start? Get a free quote.

Tell us what you have in mind, whether it’s a bathroom, a kitchen, an extension, a second storey, a deck or custom joinery. We’ll talk it through and give you a clear quote before any work starts.