Second Storey Additions · Baulkham Hills
Add bedrooms, bathrooms & living space, without moving.
Fixed price second storey additions for Baulkham Hills homeowners, from $274,000. Built to our Above Standard Carpentry Specification, with acoustic insulation in the subfloor included free on early projects.
487370C
Space without moving
More room, without leaving Baulkham Hills.
You love your Baulkham Hills street, your neighbours, the school run. What you do not love is running out of space. Moving means stamp duty, agent fees and starting over somewhere that may never feel like home.
On a million dollar purchase, stamp duty alone runs to roughly $40,000 before you have paid an agent, a conveyancer or a removalist. In a suburb like Baulkham Hills, with the schools families move here for and the M2 into the city, that maths rarely favours moving.
A second storey addition lets you stay exactly where you are and build the space you need. Extra bedrooms, a second bathroom, a private master retreat or an upstairs living zone, without giving up a metre of backyard.
Strava Group builds second storey additions across Baulkham Hills and the wider Hills District. About us.
Same land. Same street. Same address. A whole new upstairs.
Limited time offer
Free acoustic insulation in the subfloor on early Baulkham Hills packages. A quieter floor between levels, at no extra cost.
Choose your package
Three fixed price starting points.
All prices are “from”, GST inclusive, and apply to the new upper floor works only. Every package includes acoustic insulation in the subfloor while the current offer runs.
Essential
Approx. 40 to 45m²
From$274,000
1 Bed · Living · Ensuite
- New upper level with 1 bedroom
- Living or retreat area
- Ensuite
- Internal staircase allowance
- Subfloor acoustic insulation included
Best for: smaller additions, a parents’ or teenager’s space.
Family
Approx. 55 to 65m²
From$320,000
3 Beds · Living · 1 Bath
- 3 bedrooms upstairs
- 1 living area
- 1 family bathroom
- Internal staircase
- Moves bedrooms up, opens your ground floor
- Subfloor acoustic insulation included
Best for: families wanting bedrooms moved upstairs.
Complete
Approx. 70m² and above
From$348,000
3 Beds · Living · 2 Baths
- 3 bedrooms upstairs
- 1 living area
- 2 bathrooms
- Internal staircase
- Subfloor acoustic insulation included
Best for: a major, whole family transformation.
Not a package job?
Custom second storey additions.
The three packages cover the shapes we build most often. Plenty of Baulkham Hills homes do not fit them. Wider footprints, a third bathroom upstairs, a full ground floor reconfiguration underneath, or a split level that has to be worked with rather than against.
We build those too, priced against your plans rather than squeezed into a package. Same fixed price contract, same standards, same specification. Custom builds generally run $270,000 to $400,000 depending on size and what we find underneath.
Custom builds
Priced to your plans
- Any size or configuration
- Ground floor works included in scope
- Heritage and character homes
- Structural upgrades where needed
Every plan is drawn to suit your Baulkham Hills home. Package price covers the new upper floor works. Design, engineering and council approvals, plus site set-up, are quoted separately as preliminaries, at roughly $30,000.
The Strava difference
A solid, quieter upstairs.
Most second storey additions leave the cavity between the new floor joists empty. While the floor does the job, that hollow space lets sound travel. As a result, footsteps carry straight down to the rooms below.
For early Strava Group projects in Baulkham Hills we include acoustic insulation in the subfloor free. Insulation batts fill the space between the new floor joists, with yellow tongue particleboard flooring laid over the top. It is a simple step that makes for a quieter upstairs.
Free
Acoustic insulation included between the new floor joists on early packages, while the offer runs.
✦
Yellow tongue particleboard flooring laid over the joists, ready for your timber, tile or carpet finish.
↓
Helps reduce noise transfer between levels for a quieter upstairs, especially with the right ceiling system.
+
Hebel or Nexcore upgrade available where the existing structure can take the additional weight.
- Floor finishTimber, tile or carpet
- Yellow tongue particleboardFlooring sheets over the joists
- Engineered floor joistsThe new upper floor structure
- Acoustic insulationBetween the joists, included free
- Plasterboard ceiling belowTo the rooms downstairs
- Existing top plateOn the walls of your house
Upgrade: Hebel or Nexcore flooring (subject to structural capacity)
Diagram is illustrative. Acoustic ratings apply to the complete floor and ceiling system, not the batts alone, and depend on the ceiling, insulation and joist design. Subfloor acoustic insulation is included where suitable, subject to engineering, access and final scope.
Local knowledge
Building a second storey in Baulkham Hills.
Baulkham Hills shares most of what makes the Hills easy to build in, with a couple of quirks of its own. Here is what shapes a project locally.
Council
The Hills Shire
Baulkham Hills sits within The Hills Shire Council. The planning controls here are among the more generous in Sydney, and for a typical Baulkham Hills block a well designed second storey usually fits inside them with room to spare.
Approvals
CDC is usually available
Baulkham Hills has no significant heritage overlays, so the fast Complying Development pathway is open for most homes. A private certifier can approve the project rather than a full council DA, which takes months off the timeline. We confirm which pathway applies to your block before quoting.
Housing
60s to 90s brick veneer
Baulkham Hills is older than Castle Hill on average: 60s and 70s brick veneer through the original streets, 80s and 90s through the newer pockets. The older homes are more likely to be on strip footings than slabs, which is a footing question rather than a problem, and it is the first thing the engineer checks.
Blocks
Big, with real access
Baulkham Hills blocks commonly run 700 square metres and up, with double driveways and side access. Crane and scaffold access is rarely a problem here, and that flows straight through to cost.
Terrain
Real slopes
Baulkham Hills earns its name. Plenty of blocks here fall away hard, which means split levels, retaining and stepped footings are common. Slope affects the footings and the scaffold more than the design, and both get priced at the start.
Streetscape
Two storeys are the norm
Whole Baulkham Hills estates were built double storey from day one. A well designed addition does not just fit the street here, it brings a single storey home up to what the street already is.
We confirm which approval pathway your Baulkham Hills property falls under before we quote, so you know the timeline before you commit to a design.
Before anything is designed
Can your house actually take a second storey?
This is the first question, and it usually gets skipped in favour of talking about floor plans. It is worth answering properly, because for roughly one house in six the answer is no, or not without spending money you would rather put into the addition itself.
What is under the house
Your house was built to hold up one storey. A second floor roughly doubles what the foundations carry. Newer Baulkham Hills homes sit on slabs; the 60s and 70s streets are often on strip footings. Either can carry a second storey, but they get there differently, and the engineer confirms which you have before a design is drawn. That is a real cost, and you want to know about it before you fall in love with a floor plan.
What the walls are made of
A double brick house, a brick veneer house and a timber framed house each handle a new floor differently. The question is whether the weight can travel down through the walls you already have, or whether new supports need to appear somewhere you would rather they did not.
What the timber has been through
Framing that looked fine when you bought the place can be quietly damaged in ways that only matter once you ask it to hold a floor up. We look before we quote, not after.
What your council allows
The Hills Shire Council sets a height limit and protects your neighbours’ winter sunlight. Between them, those two rules often decide your ceiling heights and your roof shape before anyone draws anything.
Whether we can get a crane in
Access is rarely the problem in Baulkham Hills. Where cost does creep in is steep blocks and retaining, which we price at the start rather than discover in week three. Better to know at the start than in week three.
How we find out
An engineer checks the first three. We organise that before we give you a fixed price, because a price without it is a guess.
If your house cannot take a second storey without spending more than it is worth, we will tell you. Building out the back is usually the better answer in that case, and we build home extensions in Baulkham Hills too.
Clear scope
What is included, and what is not.
Being upfront about both is exactly how we keep your fixed price genuinely fixed.
Included as standard
In the new upper floor package area.
Quoted separately if needed
Every existing Baulkham Hills home is different, so these are assessed per property.
Want the full detail?
The complete inclusions and exclusions, right down to hardware, fixtures, fittings, finishes and specifications, are provided in detail when you enquire, and confirmed in your contract.
How the fixed price works
Our fixed price packages apply to the standard new upper floor works listed above. If your property needs structural steel, footing upgrades, extra bracing, service upgrades, defect repairs or downstairs renovation works, those items are assessed and quoted separately, clearly, before you commit. Where something genuinely cannot be priced until the roof comes off, it is listed as a provisional sum with a stated allowance rather than hidden inside the total.
The first decision
Up or out?
Most people arrive having already decided. In Baulkham Hills the block gives you a real choice, and plenty of homeowners here genuinely could go either way.
If the existing house needs work regardless, a full renovation staged alongside the addition costs less than doing them five years apart, because you pay the preliminaries once and open the walls once.
Plan · Manage · Build
Your Baulkham Hills second storey, step by step.
Our proven building process is designed to customise your project, avoid cost traps and deliver your vision with minimum disruption.
First, we review your enquiry, site, timeframe and budget. Then we contact you within 24 to 48 business hours to arrange a consultation.
Why Strava Group
A licensed builder who knows what is behind the wall.
A stronger standard inclusion
Acoustic insulation in the subfloor comes free on early packages, giving a quieter upstairs than a floor left with an empty cavity.
Structure first, always
Over a decade across site and project management on residential and commercial builds, backed by a trade background. Your addition is framed and supported to our internal Above Standard Carpentry Specification, so the new level feels solid, aligned and original.
Clear scope and fixed pricing
Transparent inclusions and exclusions from day one, so you know exactly what your Baulkham Hills project covers before you commit. NSW Builder’s Licence 487370C.
Also exploring other options? Strava Group builds home renovations and home extensions in Baulkham Hills. See our recent work in the gallery.
Get in touch
Talk to a builder about your Baulkham Hills home.
Tell us about your home and what you would like upstairs. We will let you know whether your property suits a second storey and which package fits. No cost, no obligation.
Good to know
Frequently asked questions.
We had Strava Group complete major renovation works on our property and were blown away with the quality. The attention to detail and overall finish were amazing.
Great communication, honest work, easy to work with, highly recommend to work with for any new build/renovations. If you are looking to get work done without worrying about shortcuts Strava Group is builder to use.
I highly recommend Strava Group to everyone great workmanship, reliable service, and I couldn’t be happier with the result.
I couldn't be happier with the work from Strava Group. From the beginning, Stav and the team was friendly, honest, and super easy to deal with.
We engaged Strava Group for a home extension and renovation. We are incredibly happy with the service and the results we achieved. From day one Stav and team where always willing to help with any issues we had and we loved that the main focus was as quality and longevity. Highly recommended
Had a great experience with Strava Group. The team was easy to deal with, super professional, and kept me in the loop the whole way through. They really listened to what I wanted and made the whole process feel smooth and stress-free.
Aloona T.
Google review
Orom Gabriel
Google review
Jonathan
Google review
Clara Shabow
Google review
Jonathan Jajo
Google review
Eli Kosso
Google review
Nearby
Second storey additions near Baulkham Hills.
Second storey additions nearby
The Hills District
Hornsby and the Northern Suburbs
Ryde, Hunters Hill and the North Shore
Parramatta
Southern Sydney
See all Sydney second storey addition areas.
Get your free quote today.
Ready to build up in Baulkham Hills?
Contact Strava Group for a free consultation and a quote for your second storey addition, with acoustic insulation in the subfloor included while the offer runs and a fixed price scope you can rely on. Building up is one of the most cost effective ways to add space and value under current NSW housing and construction settings.
More in Baulkham Hills
Other services in Baulkham Hills
Each page covers the local council, the homes we see in Baulkham Hills and what that kind of project typically costs.