House Extensions Dublin
Create the Space Your Home Needs Without Moving
Whether your family is growing, you’re working from home, or your current layout no longer suits your lifestyle, a thoughtfully designed house extension can transform the way you live. OS Holding provides complete house extension services across Dublin, helping homeowners create practical, beautiful living spaces that feel like a natural part of their home.
From the initial site survey and design through to construction and finishing, our team manages every stage of the project. With a dedicated project manager, planning permission guidance where required, and a fully insured team, you’ll have one experienced contractor overseeing the entire build.
Build With Confidence
- Fully insured building contractor
- Free, no-obligation site survey and quotation
- Dedicated project manager for every project
- Turnkey design-and-build service
- Planning permission guidance where required
- Workmanship and material warranties available (contract dependent)
- Member of the Construction Industry Register Ireland
- Member of the National Guild of Master Craftsmen
- Member of the Construction Industry Federation
More Space Designed Around the Way You Live
Every home is different, which is why there’s no single approach to extending your property. Some homeowners simply need a larger kitchen, while others want an entirely new living area, additional bedrooms or a way to make better use of the space they already have.
At OS Holding, we design and build a wide range of house extensions across Dublin. Whether you’re planning a compact rear extension or a larger structural addition, we’ll help you choose the solution that best suits your property, budget and long-term plans.
Our extension services include:
Single & Rear House Extensions
A practical choice for creating larger kitchens, dining areas or open-plan family spaces while making better use of your garden and existing footprint.
Learn more about our House Extension services.
Kitchen Extensions
If your kitchen no longer works for your family, a dedicated kitchen extension creates additional cooking, dining and entertaining space while improving the flow of your home.
Explore our Kitchen Extensions Dublin service.
Double Storey Extensions
Need considerably more space? A double storey extension adds valuable ground-floor living space while creating additional bedrooms, bathrooms or home offices upstairs.
See our Double Storey Extension service.
Bungalow Extensions
Extending a bungalow requires a different design approach to maintain proportions and maximise natural light. We create extensions that blend seamlessly with existing single-storey homes.
Learn about our Bungalow Extension service.
Sunroom Extensions
Bring more natural light into your home with a fully insulated sunroom extension that can be enjoyed throughout every season.
Discover our Sunroom Extension service.
Garage Conversions
If your garage is rarely used for parking, converting it into a home office, guest bedroom, gym or family room may provide the additional space you need without extending the building footprint.
View our Garage Conversion Dublin service.
Whether you already know which type of extension you want or you’re still weighing up your options, we’ll guide you through the design, planning and construction process to find the most suitable solution for your home.
Benefits of a House Extension
Create More Functional Living Space
An extension gives you the room your household needs without leaving the neighbourhood you already enjoy. Whether it’s expanding your kitchen, adding another bedroom or creating flexible family space, your home can evolve with your needs.
Improve Everyday Comfort
A better layout can make daily life easier. Open-plan living, improved natural light and additional storage all contribute to a home that feels more comfortable and practical.
Increase the Long-Term Value of Your Property
A professionally designed extension can enhance both the usability and overall appeal of your home. While every property is different, extending an existing house is often viewed as a long-term investment in both lifestyle and property value.
Enjoy One Managed Project
Instead of coordinating multiple contractors, you’ll work with a single team that manages design, planning guidance, construction and project coordination from beginning to end, helping reduce unnecessary stress throughout the build.
What’s Included in Our House Extension Services
Every house extension project is tailored to the property and the type of extension being built. Whether you’re adding a kitchen extension, converting an existing garage or constructing a two-storey addition, our design-and-build service manages the project from start to finish.
Our service typically includes:
- Free, no-obligation site survey
- Consultation and project planning
- Turnkey design-and-build service
- Planning permission guidance where required
- Structural building works
- Coordination of all required trades
- Plumbing services, heating services and electrical work where required
- Internal finishing works
- Quality monitoring throughout construction
- Final inspection and project handover
If you’re unsure which extension is the right fit, we’ll explain the advantages of each option during your consultation and recommend a solution based on your property, lifestyle and available space.
Which House Extension Is Right for You?
Choosing the right extension depends on how you want to use your home, your available space and your long-term plans.
If you want to… | Consider… |
Create a larger kitchen and dining space | Kitchen Extension |
Add space upstairs and downstairs | Double Storey Extension |
Extend a bungalow without changing its character | Bungalow Extension |
Enjoy a bright additional living space | Sunroom Extension |
Gain an extra room without extending the footprint | Garage Conversion |
Create flexible extra living space | House Extension |
Our team can help you compare the options and recommend the most practical solution for your property.
Why Homeowners Choose OS Holding
Choosing the right contractor is just as important as choosing the right extension design. Homeowners choose OS Holding because we focus on clear communication, coordinated project delivery and practical building solutions that suit both the property and the people living in it.
Complete Design-and-Build Service
Rather than managing separate designers, builders and trades, you’ll work with one experienced team from the initial consultation through to project completion.
Dedicated Project Management
Every renovation and extension is assigned a dedicated project manager who keeps you informed, coordinates the trades and helps ensure the project progresses smoothly.
Guidance Throughout the Planning Process
If planning permission or other approvals are required, we can provide guidance throughout the process so you understand the next steps before construction begins.
Projects of Every Size
From modest rear extensions through to larger family home extensions completed alongside major renovations, we tailor each project to suit the property and your goals.
Trusted Industry Memberships
Our membership of recognised Irish construction organisations reflects our commitment to professional standards and responsible building practices.
Our House Extension Process
1. Site Survey & Consultation
We visit your property, discuss your ideas, assess the available space and learn more about your requirements.
2. Design & Project Planning
Our team develops a design that suits your home while discussing construction requirements, budgets and any planning considerations.
3. Construction
Once everything is approved, our experienced builders carry out the construction, coordinating every stage of the build while maintaining quality control throughout the project.
4. Finishing & Final Inspection
After completing the extension, we carry out final finishing work, inspect the completed project and hand over your new living space.
House Extension Services Across Dublin
OS Holding provides house extension services for homeowners throughout Dublin and surrounding areas.
Whether you’re extending a period property, updating a modern family home or combining your extension with a larger renovation project, our team can help you plan and build a solution that suits your property and lifestyle.
See Our Recent Work
We’ve completed a wide variety of renovation and extension projects across Dublin.
Visit our gallery to explore completed work and see the quality of our craftsmanship across house extensions, renovations, kitchens, bathrooms and other residential building projects.
House Extension Service FAQs
Do I need planning permission for a house extension?
Planning requirements depend on the size, design and location of the proposed extension. Some projects may qualify for exempted development, while others require planning permission. We provide guidance during the planning stage to help you understand what applies to your project.
How much does a house extension cost in Dublin?
Every extension is different. The final cost depends on factors such as the size of the extension, structural work, design, specification, materials and finishing choices. We provide a detailed quotation following your site survey.
How long does a house extension take?
Construction time varies depending on the complexity and scale of the project. Your project timeline will be discussed during planning and confirmed before work begins.
Can I remain in my home during construction?
Many homeowners remain in their property while work is underway. Whether this is practical depends on the extent of the construction and how it affects your living areas. We’ll discuss this during the planning stage.
Can you manage both the design and construction?
Yes. OS Holding offers a turnkey design-and-build service, coordinating both the planning and construction phases under one project team.
Can I combine my extension with other renovation work?
Yes. Many clients combine their extension with kitchen renovations, bathroom renovations, flooring, spray foam insulation services, painting and decorating or other home improvement projects to complete everything within one coordinated build.
Which type of house extension is right for my home?
That depends on your property, budget and how you want to use the additional space. During your site survey, we’ll explain the benefits of different options, including kitchen extensions, double storey extensions, bungalow extensions, sunroom extensions and garage conversions, helping you choose the most suitable solution.
What's the difference between a garage conversion and a house extension?
A garage conversion repurposes an existing structure, while a house extension adds new floor area to your property. Both can create valuable living space, and we’ll help you determine which option is more suitable for your home.
Do I have to move out of my house during the extension work?
Not necessarily. While some disruptions are unavoidable, our team strives to minimise inconvenience. Depending on the scope of the project, you may need to make temporary arrangements for certain areas, such as the kitchen, but we aim to allow you to stay in your home whenever possible.
How soon can you start construction?
Once the final contract and plans are signed off, we typically begin construction within a few weeks. This timeline may vary based on permit approvals and project specifications. We will provide a clear schedule during the planning phase.
Do you offer a warranty on your house extension work?
Yes, we offer a warranty on our workmanship to ensure your peace of mind. The specific terms of the warranty will be outlined in your contract.
Ready to Plan Your House Extension?
If you’re considering a house extension in Dublin, we’d be happy to discuss your ideas and explain the options available for your property.
Arrange a free, no-obligation site survey with our team and receive a tailored quotation based on your home, requirements and project scope.
Commitments for Project
As a top building contractor, our team of expert tradesmen and managers is dedicated to ensuring the seamless completion of your project. Particularly, we will guide you through the process and ensure transparency to help you make informed decisions.
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