Our Past Projects
See home interiors we've transformed
Explore completed interior renovations from our Sydney clients - showcasing layout improvements, modern finishes, and clever space upgrades.
Interior Home Renovations Sydney
Renovate your home from the inside out.
It’s time to elevate your home’s interior. Get tailored advice from trusted interior renovation specialists at Kastell Building Co., and transform your space with modern finishes, smart design, and practical upgrades.
🛋️ Get expert guidance on layout & flow
🔦 Optimise lighting, storage, and function
🎯 Compare tailored renovation options
📝 Receive a clear, no-pressure quote
Renovation Packages
Interior renovation package guide
View our renovation packages to compare interior upgrade options, finishes, and inclusions across different price points - with full transparency.
Functional Family Upgrade
Starting from
$170,000
As a guide this could include:
✅ Renovate kitchen
✅ Renovate 2x bathrooms
✅ Update laundry
✅ Install timber flooring
✅ Carpet to bedrooms
✅ Repaint walls and ceilings
✅ Replace internal doors
✅ Complete project management
✅ HBCF insurance
✅ Warranties on all works
Full Home Transformation
Starting from
$250,000
As a guide this could include:
✅ Redesign internal layout
✅ Renovate kitchen
✅ Renovate 2x bathrooms
✅ Add ensuite or powder room
✅ Custom joinery throughout
✅ Install hybrid or timber floors
✅ Repaint walls and ceilings
✅ Replace internal doors and trims
✅ HBCF insurance included
✅ Warranties on all works
Rental Investment Refresh
Starting from
$100,000
As a guide this could include:
✅ Kitchen upgrade
✅ Bathroom upgrade
✅ Replace hard-wearing flooring
✅ Repaint in neutral colours
✅ Update lighting for efficiency
✅ Basic cabinetry upgrades
✅ Replace blinds or curtains
✅ High ROI rental upgrades
✅ Increase in rental income
✅ Pre-rental deep clean
Why choose us as your renovation builder?
Licensed, Insured & Guaranteed
As licensed builders, we offer full HBCF home warranty insurance, a 10-year waterproofing warranty, and $20M public liability cover - your project is protected from every angle.
Quotes with Line-Item Detail
No lump sums, no grey areas. Our quotes break down exactly what you’re paying for - so you can cut, upgrade, or swap with full visibility.
Spec With Confidence
We’ll guide you through selections with real-world advice - helping you choose fittings that won’t date, break, or blow out your budget.
Built for Long-Term Value
From joinery construction to appliance choices, we focus on durable materials and timeless design so your kitchen stays functional and stylish for years.
Pro-Level Project Tracking
You’ll get full access to your project’s live schedule, updates, and photos - so you’re never chasing us for answers. Our systems are built to keep you in control.
Minimal Disruption Guarantee
We keep your home liveable throughout the build, with site protection, dust control, and a clean-as-you-go team who respect your space and routine.
Our Trusted Partners
No items found.
Our Process
Our interior renovation process
Planning
We explore your space, goals, and budget to map out what's possible and worth investing in.
Maximising ROI
We help you make smart decisions on where to spend for the biggest impact and long-term value.
Design Selections
Together we choose layouts, finishes, and fittings that suit your lifestyle and design taste.
Quoting & Prep
You'll receive a detailed fixed-price contract and we prep the site for a safe, clean start.
Construction
Our in-house team delivers your renovation to spec then walks you through every last detail.
Get Inspired
Interior renovation inspiration
Browse our curated Pinterest boards for kitchen, living, and bedroom interiors — from minimalist upgrades to bold transformations.
No-obligation Quote
Ready to Renovate? Let’s Talk
Start your interior renovation with a free planning session. We’ll explore your ideas, walk you through options, and provide an estimate with breakdown of next steps.
FAQs
Interior Renovation FAQs
Everything you need to know about timelines, costs, approvals, and how to plan a successful interior renovation in Sydney with Kastell.
How much does an interior renovation cost in Sydney?
Interior renovation costs in Sydney can vary significantly depending on the size of the space, scope of work, and finish selections. At Kastell Building Co., most projects start around $50K for full internal refurbishments. For budgeting help, explore our Budgeting & Timelines guide.
What’s included in a full interior home renovation?
A full interior renovation typically includes layout reconfiguration, updated lighting, flooring, painting, built-in joinery, and electrical upgrades. Kastell tailors each renovation to your lifestyle, budget, and long-term goals. Learn more about our design-led renovation process.
Do I need council approval for internal renovations?
In many cases, internal renovations don’t require council approval if they fall under exempt or complying development. However, larger changes may need a DA or CDC. Learn more via the NSW Planning Portal or read our blog on DA vs CDC.
How long does an interior renovation take?
Interior renovation timelines vary by complexity, but most projects take 4–8 weeks. Kastell ensures clear scheduling, trade coordination, and site prep to minimise disruption. Learn how long each stage takes via our renovation process or in our blog on project timelines.
Can you help design my interior layout and finishes?
Yes — Kastell’s design-led approach includes layout planning, material selections, and interior finishes that reflect your goals and budget. Discover how we guide you through every step on our Design Process page or explore Pinterest boards for interior ideas.
What areas of the home can you renovate internally?
We renovate all internal spaces — including living rooms, bedrooms, kitchens, hallways, laundries, and studies. Whether you're updating one area or the whole interior, Kastell designs smart, cohesive upgrades.
Do you offer fixed-price renovation quotes?
Yes. Kastell provides detailed, fixed-price renovation quotes outlining inclusions, exclusions, trade schedules, and timelines. Learn more about what to expect on our Packages page or request a Free Renovation Planning Call.
How do I get started with an interior renovation project?
Start by booking a free renovation planning call with Kastell. We’ll explore your space, goals, and budget to map out what’s possible. See what’s involved in our step-by-step process or download Sydney’s Ultimate Renovation Blueprint.
Can you help me renovate on a set budget?
Absolutely. Kastell helps you prioritise what’s achievable within your budget — whether it’s a staged renovation or a fixed-scope project. Use our Budgeting Resources or ask us during your free consult.
What should I consider before renovating my home interior?
Before renovating, consider layout flow, natural light, storage, finishes, and long-term value. Our team at Kastell helps you plan every detail to avoid costly surprises. Read our blog on 10 Questions to Ask Your Builder.
Do you work on apartment or unit renovations in Sydney?
Yes. Kastell renovates apartments and units across Sydney, including older-style layouts needing modern upgrades. We work with strata and understand access/logistics.
How do I know which upgrades will add value to my home?
We help clients maximise ROI by suggesting upgrades that improve flow, light, energy efficiency, and appeal. Learn more on our Return on Investment page or speak to us during your free planning session.
Testimonials
Real feedback from our clients
Hear from clients who’ve upgraded their homes with Kastell. From improved layouts to beautiful finishes, discover what sets us apart.
"We couldn’t have asked for a better experience. Cameron was friendly, professional, and kept us in the loop every step of the way. Our bathroom looks incredible now!"
Fiona & Lachlan
Bathroom Balgowlah
"We were impressed by the communication and quality provided by Cameron. Kastell helped us design a kitchen that works beautifully in our apartment."
Mei & Daniel
Kitchen Renovation, Artarmon
"Kastell transformed our deck and yard into the perfect outdoor retreat. They were professional, easy to work with, and gave great suggestions along the way. We love our new space!"
Sascha & Julian
Decking & Outdoor Area
Blog
Advice for smarter renovations
Read our latest blogs on home interiors - packed with renovation tips, design ideas, planning advice, and real-world lessons from Sydney renovation projects.
Free Resource
9 secrets for a stress-free renovation
Your essential guide for renovating in Sydney. Avoid costly mistakes and stress in your next renovation – Get our free guide now!
