Thermal Mass

Explore our collection of Thermal Mass
featured on Lunchbox Architect.

Keeping your home warmer in winter and cooler in summer, thermal mass, like water, concrete and brick, (when used in conjunction with passive solar design) is a secret weapon against thermal discomfort (and expensive heating and cooling bills).

Have you ever stepped on or touched concrete after the sun has set to find it's still toasty warm? That's because concrete is great thermal mass — it absorbs and then holds heat for a long time. Materials with high thermal mass (like concrete, brick and even water) are like a thermal bank account. When times are good and the sun is shining they'll absorb the heat energy. Then, when that heat disappears (when it's cloudy or the sun has set) they'll slowly release that heat back into the atmosphere. When used in a home, this helps to moderate the temperature between the day and night.

The reverse is also true, if you cool down concrete or any other material high in thermal mass, it will stay cool for a long time, radiating that 'coolth' back into atmosphere.

When used correctly, thermal mass is a great way to store the sun's energy to keep the house warmer at night or when it clouds over. In summer (or tropical climates), the thermal mass can be used to keep the home cooler.

Bikes, Bunnies, and Brilliance: A Green Dream Home

Where bike storage isn’t an afterthought but a design-defining feature.

Rammed Earth Walls and Passive Design Makes Every Season a Breeze

Forget the front door — this beautiful rammed earth home greets you with a friendly courtyard welcome.

This Victorian Villa’s secret? A contemporary, sustainable twist (literally)

Think Victorian homes are dark and outdated? Think again! Bryant Alsop’s addition is all about light, space, and sustainability.

Why this eco-friendly home is more than just a pretty face

A home that blends into its suburban surroundings while quietly championing passive solar design and low-carbon construction...

A Stunning New Family Home That Respects and Remembers Its Roots

A new build that honours its humble but much loved predecessor while embracing modern sustainability and style…

Clever Design Under One Roof: Maximising Space in Urban Duplex Living

How Kreis Grennan Architecture used smart design to create two spacious homes on a compact site...

A 90s renovation had made one big mistake…

Now this home enjoys a modern upgrade, reconnecting the kitchen to the backyard and adding eco-friendly touches...

Sustainable renovation: From dark bungalow to light-filled haven

This renovation isn't just an update—it's a tribute to the original design, reimagined for today.

Embracing the Coastal Lifestyle: River of Life, Curl Curl

Soak in the fluid lines and light and airy interiors of this modern coastal home in Sydney's Northern Beaches...

It's not a commerical carpark, it's a beautiful, sustainable home!

Going against the status quo in this beach town, sustainability meets style in a thermally-consistent, biophilic, family home.

Discover Mark and Megan’s Off-Grid Hempcrete Home on the Sunshine Coast

Explore how this family built a sustainable, energy-efficient home using innovative hempcrete construction in a stunning location.

Discover an accessible luxury retirement home with a twist!

Ditch the retirement village with this private accessible luxury retirement home filled with light and sustainability features...

Mid-century-inspired home office makes working from home a dream...

This creative decided to transform his double garage into a functional and beautiful home office - just *before* the pandemic hit.

An intricate roofline, folded like origami, grabs light and views

Folded perfectly, the 10-fold roofline of this home grabs the light and views of treetops and provides privacy from neighbours.

The perfect slice of beach house living...

This triangular beach house nestled among the gums and grasses is the perfect slice of beach house living only an hour from Melbourne.

A mid-century-inspired forever home exceeded owners' expectations

Creating a modern home that takes advantage of its semi-rural setting with plenty of mid-century flair is no simple task...

A home fit for ageing in place doesn't need to look institutional...

When you think of ageing in place, you might imagine ramps, grab rails and a lot of linoleum. But it doesn't have to be that way...

Buy the plans for this sustainable, cost-effective four bedroom home

Clad in native timber, Silvertop House is at home in the country or the 'burbs and you can purchase the plans to build it on your block!

Beach House Nestles Into Its Spectacular Limestone Cliff Setting

Not much larger than the original shack but makes better use of the site and views; the perfect place to host friends and family.

Building a special home on a site they know and love...

The owners of this coastal block enjoyed years of beach holidays before deciding to build. Here's how it shaped their home...

Modern Addition Creates a New Heart for This Weatherboard Cottage

By removing poorly constructed add-ons and creating an open-plan living area as the new heart, this quaint cottage is transformed...

You'd Never Know How Close the Neighbours Are in This Bush Hideaway

A clever design captures bush views and sunlight and turns away from the neighbours so you feel like you're in a world of your own...

A Series of New Spaces Unfurl From Single-fronted Victorian Cottage

Far from the classic box-like addition, a series of unique spaces unfurl from the rear of the cottage, opening up to light and garden.

Clever Design Brings Light Into the Heart of this Bungalow

Bungalows are charming homes, but they tend to be dark. This addition finds a way to bring light into the depths of this bungalow.

Fibro Beach House Reboot Creates a Sustainable and Affordable Home

When thinking about how to create a sustainable and affordable home, the 1960s-era fibro beach shack was the perfect inspiration...

A Mid Century-inspired Home Designed to Work Well With the Landscape

On a tricky, but naturally beautiful battle-axe site, this home celebrates its assets and minimises its drawbacks.

A New Townhouse Nestled in the Quiet Streets of a Country Town

You don't envisage a townhouse when you think of country town living, but this architect's own home is perfect for her family.

Inner-city Maisonette Transformed Thanks to New Living Space

A new 60 square metre addition creates a bright and modern living space for this inner-city home.

Addition Expands This Home in Search of Light and Access to the Yard

An addition which doesn't overshadow the original heritage house, but improves the home's spaciousness, access to light and the yard.

'Box in the Back' Creates an Elegant and Cost-effective Home Addition

A simple, rectangular, double-storey addition was a cost-effective way to gain the space this family needed. Plus some indulgences...

Like a Jewellery Box, This Home Is Perfect for Your Precious Family

This home, inspired by a jewellery box, is perfect for your most treasured people and possessions: beautiful, safe and ordered.

A Modern Home Filled with Character, Sun, Air and Sky Views

Modern homes can be criticised for lacking character, but modern doesn't need to equal sterile.

Renovating a House That Has Been in the Family for Almost 70 Years…

Imagine having a classic modernist house in the family for three generations? How would you sensitively renovate it?

A Home Designed for a Family to Come Together or Find their Own space

Bringing together all the things they loved from previous houses, their new home represents the good life for this family of five.

This New Zealand Home is Designed to Soak In Stunning Alpine Vistas

An L-shaped floor plan creates sheltered outdoor space, maximises the view and builds in flexibility to this beautiful home.

This New Addition Creates a Sunny Courtyard Shared by Old and New

Originally a parsonage for the neighbouring church, this historic home has been transformed with a contemporary addition.

Downsizing From a Farm Doesn't Mean Sacrificing Privacy and Space

This new home in a semi-rural estate balances a sense of space with a need for privacy so the shift from the farm life isn't so hard.

Transforming This Single-fronted Edwardian Home for Modern Living

While older homes have character baked in, they're not built for modern living. But, you can have the best of both worlds; old and new!

This Home Demonstrates Benefits of an Architect Versus Off-the-Plan

A refined and considered home in a new estate shows the power of using an architect versus buying off-the-plan from a bulk builder.

A Home That Celebrates Its Site by Bringing the Outdoors In...

For tree-changers Matt and Leanne, an important part of their ideal home was making the most of their spectacular site.

A House for All Seasons Designed and Built to Passive House Standards

This family home was designed with best-practice sustainability and Passive House standards to be a comfortable home for years to come.

This Modern Farmhouse Is Adaptable and Celebrates a Stunning Location

A modern farmhouse for a couple with overseas relatives needs to adapt from a comfortable home for two to a home for many more.

Transforming a Run-down Weatherboard Into a Bright, Sustainable Home

Want a sustainable home, but don't know where to start? An architect can help you create a comfortable, sustainable home...

An Akubra Was the Inspiration for This Incredible Off-grid Home

The practicality of a classic hat proves the perfect design inspiration for an off-grid home in Australia's outback.

An Inner City Sustainable Addition Opens Up to the Garden

Using passive design techniques, this new living space embraces the outdoors and will be comfortable year-round without relying on AC.

The Simple Life: House Designed for an Acreage; Robust, yet Elegant

Looking for a simpler lifestyle and to indulge their passion for horses, this modern home for their acreage is perfection.

Clever Renovation to a Small, Corner Site in a Heritage Area

This home defies its tight site by using screening and careful window placement to grab light and views without exposing itself.

From Faux Colonial to Minimal and Modern: Updated for Modern Living

A new opening with integrated seating transforms this home from dated colonial-style, to modern, minimal and cool. What a difference!

Architect Reinterprets Queenslander for a Bright and Breezy Addition

Queenslander-style homes capture breezes and create shaded, naturally cool living spaces. This addition takes it to the next level.

Creating an Urban Oasis on a Tight and Narrow (5 Metre Wide) Site

Courtyard House makes the most of a narrow, inner-city site, creating an urban oasis for a family of five now and into the future.

Renovating a House to Better Suit Your Lifestyle

The small, pokey and often dark spaces of many older homes don’t provide the space young families need, but you can change that...

This Home Sits Comfortably on an Expansive Rural Property

Oriented for passive heating and cooling and taking in stunning views of the landscape, Paddock House feels right at home in the bush.

This Compact Home Makes the Most of its Dramatic Rural Site

Celebrating an incredible rural site, this eco-friendly home opens up to the views, basks in the sun and collects all its own water.

A Compact Addition Creates a Comfortable and Sustainable Home

Living in the inner-city means trading space for convenience. This project shows you, that trade-off isn't so bad.

Two New Townhouses for an Adventurous Architectural Photographer

A creative design for two new townhouses defies many of the qualities of these types of developments to create bright and breezy homes.

The Clever Reason to Skip a Backyard in Favour of a Side Yard Instead

If your backyard doesn't face north, create a long side yard instead so you can enjoy the benefits of natural light and passive design.

A Light-filled Annexe-like Addition Opens This Home Up to the Garden

Like an annexe attached to the side of this solid home, BENT Annexe is an open-plan living area that feels more like a garden room.

A Clever Addition Traps the Sun to Keep This Home Comfortable

This family were miserable in their south-facing living areas, but thanks to a clever addition, their home is now light and bright.

Contrasting Addition Complements a Sixties Yellow Brick Home

The good qualities of both old and new are highlighted by creating an addition which is the binary opposite of the original.

A Breezy Beach House Designed for Byron Bay's Sub-tropical Climate

Sub-tropical climates require a special approach to design to ensure they are comfortable in the sticky summers and the cool winters.

The Outlook of this 1940s Home Just Got a Lot Brighter...

A new addition prioritises light and a connection to the garden, transforming this 1940s house into an uplifting and modern home.

Abandoned for Years, This Elegant Villa Is Now a Sustainable Home

This house had become a squat and burnt down during the design stage, but Dean and Lisa transformed it into a modern, sustainable home.

Sustainable Owners Renovate with Minimum Carbon Footprint

With a passion for sustainability, these owners salvaged whatever they could to reduce the carbon footprint of their renovation.

A Unique Vaulted Ceiling and Clerestory Windows Bring in the Light

A home on a corner block maximises light without sacrificing privacy by reorienting to the north and some strategic clerestory windows.

A Small Addition Creates a Home Greater Than the Sum of Its Parts

Light and dark, east and west, new and old, Dark Light House's new living pavilion contrasts without simply doing the opposite.

A New Glass Box Protrudes to Transport this Family into the Landscape

Breaking out of the old, brown-brick home, this new glass box for living is surrounded by birdlife and the sounds of insects at dusk.

What to Do When You Outgrow Your House but Love Your Neighbourhood?

Craving more space (and sun) and considering a move? Are you really better off uprooting your family and moving somewhere new?

Some Simple Modifications Transform This Unrenovated Family Home

Simple, yet intelligent changes, which reference to the home's post-war cream brick heritage create a period drama of a difference.

A Fun-Filled Addition Peaks Above This Californian Bungalow

It's Playtime in this fun-filled extension with secret hatches, a bridge, sloped walls and an aquarium of curious creatures.

A Mexican-inspired Swiss Chalet in the Australian Bush... What?!

The architectural equivalent of a lamington made with Swiss cheese and dusted with paprika sounds like a recipe for disaster, but is it?

A Cozy, Nest-Like Mezzanine Studio Floats Above This Living Space

To unite all living spaces without creating one large space, a unique nest-like studio sits above the living area in this reno.

Turns Out Hemp Is Useful for More Than Rope and Yoga Pants

Built from rammed earth, timber and hempcrete, this home is a healthy and environmentally sensitive space for three generations.

A Home Designed to Get Better With Age, Just Like Its Retiree Owners

Precast concrete and timber combine to create a low-maintenance home that will get better with age.

How Can You Fit a Family of Six in 140 Square Metres?

This compact family home uses the power of the sun for heating and cooling, keeping a family of six happy and comfortable.

Architects Design an Economical Addition to Their 1950s Home

A new addition slides under the eaves of this home, complementing the 1950s original, but reflecting the changing needs of Australians.

Meet the Modular Home Design Inspired by a Piece of IKEA Furniture

With a grid system and the flexibility to adapt to various sites and needs, Allen Key House is the 'Billy' of the housing world.

A Modern Australian Home Nestles Into Stunning Natural Landscape

A combination of bricks, timber, corrugated iron and translucent sheeting help this home complement its semi-rural landscape.

A Compact Home Was Made Even Smaller but the Outcome is Extraordinary

This compact home was made even smaller yet better, proving the amount of space you have is less important than how you use it...

Urban Green House Creates a Sunny, Healthy, Happy, Inner-City Home

Application of passive design principles creates a living, breathing, sustainable space that is a pleasure to inhabit.

This Light-Filled, Happy Addition Pays Homage to the Sun

This new living space is a sun-lover. Turning to face the sun, it is also a fun and happy space, not to mention a cost-saver.

This is How You Deal With an Unusual Triangular Site...

What do you do with a triangular site? Perhaps the best solution is to think outside of the box. Or triangle, as the case may be...

These Owners Take Their Love of Gardening to New Heights

A deep soil green roof improves this home's environmental credentials, looks great and satisfies the owners' love of gardening.

Living and Alfresco Pavilion Captures the Sun and Connects the Garden

A new living pavilion built from concrete blocks and with large windows facing the sun contrasts with the original weatherboard home.

New Studio Builds Future Flexibility Into This Hawthorn Home

A studio connected to the main house by a decked walkway creates maximum flexibility (and reduces renovation stress) for this family.

A Rural Retreat Fit for an '80s Pop Star and His Creative Family

Built for a family bursting with creative souls, this shack needed to be as stylish and as interesting as the people living in it.

Rusty and Weathered, This Home Looks Like It Has Been Here Forever

Built from recycled timber and rusting steel, this Mt Duneed home already looks old, yet is built to last with little maintenance.

Renovation Achieves an Energy Positive and Income Generating Home

A passive design and solar panels creates a comfortable house year-round which also generates income for this family.

Clever Renovation Creates New Building Over Bones of the Original

Renovation uses half of the original roof structure to create a new raked roof and wraps the original fibro shack in new cladding.

Old School Friends Unite to Design a Tranquil Home for a Busy Family

A renovation creates flexible but calm spaces for a blended family, visiting overseas relatives, and a professional home office.

A Modern Off-Grid Eco-House Surrounded by a Permaculture Farm

Supporting the clients' desire for a sustainable lifestyle, this off-grid home uses passive solar design to reduce energy consumption.

A Little Bit of Zinc Hints At What's Happening Behind Red Brick House

Clad in zinc, this simple rear addition creates a light-filled, low-fuss extension for a young family to grow.

Black Is the New White at This Striking 'House in the Round' Addition

At this highly visible corner block, the architects have designed a black extension to contrast with the white Edwardian original.

Choose Flexibility Over Footprint to Save Money and Energy

With sliding doors and a fold down bed, a rumpus room/third bedroom provides built in flexibility while reducing the overall footprint.

A Home Designed for Light and Family, Not 'The Market'

When you need to fit a lot onto a small block, forget market expectations and look for light and functionality to suit your family.

From Disused Inner-City Car Park to a Compact Family Home

From the street this modern take on the other single storey cottage in the neighbourhood. But things get interesting quickly...

Townhouse is a Taste of the '70s with a Mid-Century Modern Twist

This compact inner-city townhouse has been transformed from an unremarkable '70s era building into a timeless, light-filled home.

New Solar Extension Designed to Power the Whole House

A rear extension takes advantage of a North-facing backyard to connect to the garden and generate electricity for the whole house.

This Home Takes the Need to Connect to Green Space Very Seriously

You can tell something's different about this heritage home from the moment you see the lime green door and pastel green walls...

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