Concrete Foundations NZ
Concrete Services
- New Zealand
Strong foundations for lasting structures
Strong, correctly constructed concrete foundations provide the base for homes, garages, additions and commercial buildings. Concrete Services Direct can help homeowners, builders and businesses arrange quotes for foundation concrete work throughout New Zealand.
- Concrete foundations for new builds
- House and residential foundations
- Garage and shed foundations
- Foundations for additions and extensions
- Concrete footings and foundation walls
- Residential and commercial projects
- Work to project plans and specifications
- Concrete foundation services throughout New Zealand
- Free, no-obligation quotes
Concrete Foundations for Homes, Buildings & Construction Projects
The foundation is one of the most important parts of any building. It transfers the weight of the structure into the ground and provides the stable base upon which the rest of the project is constructed.
Concrete foundations are used throughout residential, commercial and building projects across New Zealand.
Depending on the design, foundation work may include concrete footings, foundation walls, ground beams, slabs and other structural concrete elements.
Because foundation requirements vary according to the building design, site conditions and structural specifications, the concrete work needs to follow the requirements established for the individual project.
Whether you’re constructing a new home, garage, addition or commercial building, tell us about your project and request a free concrete foundation quote.
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Concrete Foundations for New Homes
A new home begins from the ground up.
Before framing, roofing and interior work can progress, the building requires foundations designed to provide appropriate support for the structure.
Depending on the design of the home, the foundation system may involve:
- Concrete footings
- Foundation walls
- Ground beams
- Reinforced concrete slabs
- Thickened slab edges
- Structural reinforcing
- Service penetrations
- Hold-downs and fixings
- Other engineered concrete components
The exact foundation system will be determined by the building design, ground conditions and applicable plans or engineering specifications.
Foundation concrete needs to be coordinated carefully with excavation, reinforcing, plumbing, drainage and other parts of the construction process.
House Foundations
Concrete house foundations perform an important structural role by transferring loads from the building into the supporting ground.
Different homes can require very different foundation systems.
Factors influencing the design can include:
- Building size
- Building weight
- Number of storeys
- Ground conditions
- Site slope
- Soil type
- Wind and seismic requirements
- Floor design
- Engineering specifications
For this reason, foundation work shouldn’t be treated as a generic concrete job.
The dimensions, reinforcement, concrete specification and construction details need to match the requirements established for the project.
Concrete Foundations for Additions & Extensions
Adding another room, extending a living area or building onto an existing home often requires new foundations that integrate with the existing structure.
Extension foundations may be required for:
- Bedroom additions
- Living room extensions
- Kitchen extensions
- New wings
- Attached garages
- Entrance additions
- Enclosed outdoor areas
- Other structural additions
Working alongside an existing building can create additional considerations involving foundation levels, existing construction, drainage, access and connections between old and new structures.
Plans or engineering details will usually establish how the new foundation needs to be constructed.
Garage Foundations
Garages require an appropriate foundation and floor system capable of supporting the structure and its intended use.
A garage project may involve:
- Perimeter foundations
- Ground beams
- Concrete slab
- Reinforcing mesh or steel
- Thickened edges
- Vehicle entrance details
- Anchor points
- Service penetrations
The requirements depend on the garage design, size, construction method and site.
Whether you’re building an attached garage or a separate structure, it is useful to plan the foundation and garage slab together so levels and structural requirements are properly coordinated.
Shed & Workshop Foundations
Larger sheds and workshops can also require concrete foundation systems rather than simply being positioned on an unreinforced pad.
Depending on the structure, foundations may need to accommodate:
- Structural frames
- Portal frames
- Heavy equipment
- Vehicle loads
- Machinery
- Storage systems
- Building anchorage
Small garden sheds and large workshops have very different requirements.
If you’re planning a shed, workshop or similar building, provide information about the structure when requesting your quote so the concrete work can be considered against the actual project requirements.
Commercial Concrete Foundations
Commercial buildings often involve larger and more complex foundation requirements than typical residential projects.
Concrete foundation work may be required for:
- Offices
- Retail buildings
- Workshops
- Warehouses
- Storage buildings
- Light industrial premises
- Commercial additions
- Other building developments
Commercial foundation systems can include combinations of footings, pads, ground beams, foundation walls and reinforced slabs.
The concrete contractor may need to work alongside builders, engineers, excavation contractors, plumbers and other trades to complete the foundation work in the correct sequence.
Concrete Footings
Concrete footings help distribute structural loads into the ground beneath a building or structure.
They can be used beneath:
- Foundation walls
- Structural posts
- Columns
- Retaining structures
- Building frames
- Other load-bearing elements
The size and reinforcing requirements of a footing depend on the loads it will carry and the ground conditions beneath it.
For structural work, the footing dimensions and reinforcement are generally established through the building plans or engineering design rather than chosen during the concrete pour.
Strip Footings
Strip footings are continuous concrete footings commonly positioned beneath load-bearing walls or foundation elements.
They spread the building load across a wider area of ground.
Depending on the design, strip footings may include reinforcing steel and connections to foundation walls or slabs.
Excavation depth, footing dimensions and reinforcing specifications should follow the requirements for the individual building project.
Pad Foundations & Pad Footings
A concrete pad footing provides concentrated support beneath a structural point such as a post or column.
These may be used in certain residential, commercial and structural applications.
Their size and depth depend on:
- Structural loads
- Ground bearing capacity
- Column or post design
- Engineering requirements
Pad footings shouldn’t be confused with general-purpose concrete pads used for sheds, equipment or outdoor areas.
Structural foundation pads form part of the engineered support system of the building.
Concrete Foundation Walls
Some foundation systems include reinforced concrete foundation walls extending between footings and the building above.
Foundation walls may help:
- Support the structure
- Retain surrounding ground
- Create required floor levels
- Transfer building loads
- Form part of subfloor areas
The construction method can vary depending on the building design.
Formwork, reinforcing placement, concrete strength and connections all need to follow the relevant project specifications.
Ground Beams
Concrete ground beams are reinforced structural beams formed at or near ground level.
They can be used to transfer loads between foundation points or support building elements.
Ground beams may form part of residential, commercial or engineered foundation systems.
Because they perform a structural function, their dimensions, reinforcing and concrete requirements should follow the plans prepared for the project.
Concrete Slab Foundations
Many buildings use a concrete floor slab as part of the overall foundation system.
A slab foundation may incorporate features such as:
- Reinforced concrete flooring
- Thickened perimeter edges
- Internal foundation beams
- Service penetrations
- Moisture barriers
- Insulation systems
- Plumbing and drainage
- Structural reinforcing
Concrete slab foundations require coordination between several trades before the concrete is poured.
Once concrete has been placed, changing services or structural details can become considerably more difficult.
Foundation Excavation
Foundation construction usually begins with excavation.
The amount and type of excavation depends on:
- Building footprint
- Foundation design
- Ground levels
- Soil conditions
- Site slope
- Existing structures
- Access
Excavation needs to reach the required dimensions and levels established for the foundation.
Where ground conditions differ from those anticipated, further assessment may sometimes be required before foundation work continues.
Ground Conditions & Concrete Foundations
The ground beneath a foundation is critical because the foundation ultimately relies on that ground for support.
Ground conditions can vary significantly between properties and even across a single building site.
Potential considerations include:
- Soft ground
- Filled ground
- Clay
- Sand
- High groundwater
- Expansive soils
- Sloping sites
- Previous excavation
- Existing foundations
Where challenging ground conditions are present, the foundation design may require additional engineering or specialist solutions.
The concrete foundation needs to be constructed to suit the site rather than assuming every property requires the same approach.
Foundation Reinforcing
Concrete performs very well under compression, while reinforcing steel helps it deal with tensile forces and movement.
For this reason, reinforced concrete is widely used in structural foundations.
Reinforcing can include:
- Steel bars
- Reinforcing mesh
- Starter bars
- Reinforcing cages
- Connections between structural elements
The amount, size and positioning of reinforcing are important.
For engineered foundation work, reinforcement needs to match the specified design before the concrete is placed.
Concrete Strength for Foundations
Different concrete projects can require different concrete specifications.
For structural foundations, the required concrete strength will generally be established by the building plans, engineering documentation or relevant project specification.
The appropriate concrete shouldn’t simply be selected based on what is commonly used for unrelated projects such as patios or residential paths.
Factors may include:
- Structural design
- Foundation type
- Exposure conditions
- Building requirements
- Engineering specifications
The contractor pouring the concrete needs to know the required specification before ordering and placing the concrete.
Foundation Boxing & Formwork
Formwork, often referred to as boxing, is used to create the required shape and dimensions of many concrete foundation elements.
Depending on the foundation design, formwork may be required for:
- Foundation walls
- Ground beams
- Slab edges
- Steps in foundation height
- Pads
- Other structural elements
Formwork needs to remain stable while concrete is being placed.
Foundation dimensions, levels and positioning should be checked before the pour because errors become much harder to correct once the concrete has hardened.
Services Through Concrete Foundations
Building foundations often need to accommodate plumbing, drainage, electrical or other services.
These may involve:
- Pipe penetrations
- Waste pipes
- Water services
- Electrical conduits
- Drainage connections
- Service ducts
The position of these services should be coordinated before the concrete pour.
Incorrectly positioned penetrations can create unnecessary complications later in the build.
For larger projects, coordination between the builder, plumber, drainlayer, electrician, engineer and concrete contractor can be particularly important.
What Is Involved in Constructing Concrete Foundations?
The exact process differs between buildings, but foundation construction commonly includes several stages.
1. Plans & Site Preparation
The building plans, engineering details and site requirements are reviewed before work begins.
The building area is cleared and prepared for excavation.
2. Excavation
Foundation trenches, pads or other required areas are excavated to the specified dimensions and levels.
3. Base Preparation
Depending on the foundation system, the underlying area may require levelling, compacting or other preparation before reinforcing and concrete work begins.
4. Formwork
Boxing or formwork is installed where needed to create the required concrete shapes and levels.
5. Reinforcing
Reinforcing steel is installed according to the plans and specifications.
Correct positioning and cover around reinforcing are important parts of structural concrete work.
6. Services & Penetrations
Required plumbing, drainage and other service penetrations are positioned before the concrete is poured.
7. Inspection
Where required by the building consent or project documentation, foundation work may need to be inspected before concrete placement.
8. Concrete Placement
Concrete is poured into the prepared footings, beams, walls or slab areas.
It is placed and compacted as required to achieve the specified result.
9. Finishing & Curing
The concrete is finished appropriately and allowed to cure before subsequent building work places significant loads on the foundation.
Foundation Levels
Correct foundation levels are essential because many later stages of construction depend on them.
Foundation levels can influence:
- Floor height
- Door thresholds
- Cladding clearances
- Drainage
- Garage levels
- Outdoor concrete
- Decking
- Landscaping
Errors at the foundation stage can flow through into multiple parts of the build.
This makes accurate setting out and checking before the concrete pour particularly important.
Concrete Foundations on Sloping Sites
Sloping sections can create more complicated foundation requirements.
Depending on the building design and degree of slope, solutions might involve:
- Stepped foundations
- Retaining structures
- Ground beams
- Different foundation levels
- Additional excavation
- Engineered foundation systems
Water movement and drainage can also become more important on sloping properties.
A foundation design suited to a flat site should not automatically be assumed to work on a significantly sloping section.
Foundations for Renovations
Renovations can involve foundation work when:
- Structural walls are moved
- New rooms are added
- Floors are extended
- New load-bearing elements are introduced
- Garages are attached
- Existing structures are substantially altered
Renovation foundation work often requires more care because new concrete needs to work around an existing building.
Access can also be more restricted than on a clear new-build site.
Concrete Foundations & Building Consent
Many building foundation projects form part of work requiring a New Zealand building consent.
The specific requirements depend on the type and scope of the building work.
Where consent is required, foundation construction needs to follow the approved plans and applicable requirements.
Inspections may also be required before concrete is poured or at other stages of the foundation work.
The property owner or project manager should ensure that the appropriate consent and documentation are in place before work proceeds.
Do Concrete Foundations Need Engineering?
Not every small concrete project requires structural engineering, but many building foundations are designed using standard building solutions or specific engineering information.
Engineering may be particularly relevant where there are:
- Unusual ground conditions
- Significant structural loads
- Complex buildings
- Sloping sites
- Retaining requirements
- Non-standard foundation designs
- Large commercial buildings
If engineering documentation has been prepared, provide it when obtaining quotes so the contractor can understand the actual foundation requirements.
Building Plans & Concrete Foundation Quotes
For foundation work, providing plans can make the quoting process considerably more accurate.
Useful documentation may include:
- Architectural plans
- Foundation plans
- Structural engineering drawings
- Reinforcing details
- Building specifications
- Site plans
- Geotechnical information where applicable
These documents help identify dimensions, concrete volumes, reinforcement and the complexity of the work.
If plans are still being prepared, an initial enquiry can still be made, but the final quote may depend on receiving the completed documentation.
How Much Do Concrete Foundations Cost?
There isn’t one standard price for concrete foundations because foundation systems vary considerably.
Cost can depend on:
- Building footprint
- Foundation type
- Excavation
- Ground conditions
- Site access
- Concrete volume
- Concrete strength
- Reinforcement
- Formwork
- Foundation depth
- Structural complexity
- Site slope
- Labour
- Engineering requirements
- Project location
A simple garage foundation and a large engineered commercial foundation can involve completely different scopes of work.
For building projects, plans and engineering documentation provide the best basis for obtaining an accurate foundation quote.
How Long Do Concrete Foundations Take?
Foundation timeframes vary according to the size and complexity of the building.
The overall process can include:
- Excavation
- Ground preparation
- Formwork
- Reinforcing
- Plumbing and services
- Inspections
- Concrete placement
- Curing
- Removal of formwork
Weather, inspection scheduling and coordination with other trades can also affect the programme.
The actual concrete pour is only one part of the complete foundation process.
How Long Do Foundations Need to Cure?
Concrete begins gaining strength soon after it is placed and continues developing strength over time.
The amount of time required before subsequent building stages can proceed depends on the concrete specification, structural requirements and type of load being applied.
Rather than relying on a generic timeframe, builders should follow the requirements and advice applicable to the particular project.
Concrete Foundation Repairs
Existing foundations can sometimes develop problems as buildings age or ground conditions change.
Potential signs can include:
- Cracking
- Movement
- Settlement
- Uneven floors
- Changes around doors or windows
- Visible deterioration
Foundation problems can have many causes and shouldn’t automatically be treated as a straightforward concrete repair.
Where structural movement or significant cracking is present, professional assessment may be required to identify the cause before deciding on a repair method.
Repair solutions can vary considerably depending on the building and underlying issue.
Residential Concrete Foundations
Residential concrete foundation services may be required for:
- New homes
- Townhouses
- Garages
- House additions
- Extensions
- Sleepouts
- Workshops
- Ancillary buildings
Each project should be approached according to its plans and structural requirements.
Whether you’re a homeowner organising a project yourself or a builder seeking concrete services for a construction job, providing as much project information as possible helps with the quoting process.
Commercial Concrete Foundations
Commercial projects can involve substantially larger foundation systems and greater quantities of structural concrete.
Potential projects include:
- Warehouses
- Workshops
- Retail buildings
- Offices
- Storage facilities
- Light industrial buildings
- Commercial additions
Commercial contractors may need to work to detailed structural drawings, construction programmes and site-specific requirements.
Concrete Services Direct can assist with enquiries for commercial foundation and structural concrete projects.
Concrete Foundations Throughout New Zealand
Concrete Services Direct can help arrange concrete foundation services across many parts of New Zealand.
Service areas include:
- Northland
- Auckland
- Waikato
- Gisborne
- Bay of Plenty
- Hawke’s Bay
- Taranaki
- Manawatu
- Wairarapa
- Wellington
- Tasman
- Marlborough
- West Coast
- North Canterbury
- South Canterbury
- Otago
- Southland
Whether you’re building a home, garage, extension or commercial property, provide your location and any available plans or project information when requesting a quote.
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Frequently Asked Questions About Concrete Foundations
What is a concrete foundation?
A concrete foundation is the structural base that supports a building and transfers its loads into the ground.
Depending on the building, it may include footings, foundation walls, ground beams and concrete floor slabs.
What types of buildings use concrete foundations?
Concrete foundations are used for a wide range of structures including houses, garages, extensions, workshops, warehouses and commercial buildings.
The foundation design depends on the structure and site.
Do I need plans before getting a foundation quote?
Plans are extremely useful and may be necessary for an accurate final quote.
Architectural plans, foundation drawings and engineering details show the dimensions, reinforcement and structural requirements that need to be priced.
You can still make an initial enquiry before the plans are completed.
Does a concrete foundation need reinforcing?
Structural concrete foundations commonly use reinforcing steel.
The required bar sizes, mesh, spacing and positioning depend on the foundation design and project specifications.
What are concrete footings?
Footings are concrete structural elements positioned beneath walls, columns or other loads.
They help spread the weight of the building into the ground.
What is a ground beam?
A ground beam is a reinforced concrete beam at or near ground level that transfers loads between foundation points or supports parts of a structure.
Can concrete foundations be built on sloping sections?
Yes, but sloping sites can require more complex foundation designs, excavation and drainage.
The appropriate solution depends on the building and site conditions.
Do foundations require a building consent?
Many foundation projects are part of building work requiring consent in New Zealand.
Requirements depend on the type and scope of the project, so the applicable consent requirements should be confirmed before construction begins.
Do concrete foundations need to be inspected before pouring?
Some consented building projects require inspections before concrete placement.
The inspection requirements are determined by the project documentation and relevant building consent process.
How much do concrete foundations cost?
Foundation costs vary considerably according to building size, ground conditions, excavation, concrete volume, reinforcement, formwork and structural complexity.
Plans and engineering details provide the best basis for preparing an accurate quote.
Can you pour foundations and the concrete slab together?
Some foundation systems are designed so particular foundation and slab elements are poured together, while others involve separate stages.
The construction sequence should follow the specific design and plans for the building.
Can existing foundations be repaired?
Some foundation problems can be repaired, but the underlying cause needs to be understood first.
Significant movement or structural cracking may require assessment before a repair solution is determined.
Do garage foundations have different requirements from house foundations?
They can.
The foundation design depends on the garage size, construction method, loads, ground conditions and whether it is attached to another building.
How do I get a concrete foundation quote?
Provide your project location, type of building and any available plans or engineering drawings.
Information about site access, project timing and whether excavation has already been completed can also be useful.
Get A Quote for Your Concrete Foundations
Whether you’re building a new home, garage, extension, workshop or commercial property, Concrete Services Direct can help you get the foundation quoting process underway.
Provide your location, details about the project and any plans or structural documentation you already have.