Double Storey Extension Dublin

Build With Confidence

• Fully insured building contractor
• Free, no-obligation site survey and quotation
• Dedicated project manager throughout your project
• Complete turnkey design-and-build service
• Planning permission guidance
• Projects of all sizes
• Workmanship and material warranties (contract dependent)
• Member of the Construction Industry Register Ireland
• Member of the National Guild of Master Craftsmen
• Member of the Construction Industry Federation

A Double Storey Extension Designed Around Your Home

A double storey extension is one of the most effective ways to increase living space while improving how your home works for your family.

Instead of adding just one room, you can extend both floors simultaneously. Many homeowners choose this option to create a larger open-plan kitchen and living area downstairs while adding bedrooms, bathrooms or a home office upstairs.

Every property is different, which is why we begin by understanding your goals, the layout of your home and the available space before recommending the most suitable extension.

Our turnkey service means you don’t need to coordinate multiple contractors yourself. OS Holding manages the project from the early planning stages through to construction and completion, giving you a single point of contact throughout the build.

Why Homeowners Choose a Double Storey Extension

Gain More Living Space

Expanding across two floors provides significantly more usable space than many single-storey projects. It allows your home to grow with your family’s needs without the expense and disruption of relocating.

Improve Your Home’s Layout

Many older Dublin homes no longer suit modern family living. A double storey extension provides the opportunity to create brighter living areas, larger kitchens and better connections between rooms while improving the upstairs layout.

Increase Property Value

A thoughtfully designed extension can improve both the functionality and long-term appeal of your property by adding valuable floor space and creating a more practical home for future buyers.

Build Around Your Lifestyle

Whether you need additional bedrooms, a larger family kitchen, a home office, guest accommodation or extra bathrooms, every extension is designed around how you use your home rather than following a standard layout.

What’s Included in Our Double Storey Extension Service

Every extension project is different, but our design-and-build service typically includes:

• Free site survey and initial consultation
• Design advice based on your property and requirements
• Planning permission guidance where required
• Structural construction
• Roofing and external building works
• Windows and external doors
• Internal walls and plastering
• Electrical and plumbing installation where applicable
• Heating integration
• Flooring preparation
• Project management throughout construction
• Final finishing works agreed within your quotation

Where additional renovation work is planned alongside the extension, we can also coordinate services such as kitchen renovation, bathroom renovation, electrical upgrades, plumbing, flooring, decorating and insulation as part of a single project.

Every quotation is prepared around the individual property, scope of work and specification rather than using a one-size-fits-all package.

Understanding the Cost of a Double Storey Extension

One of the first questions homeowners ask is how much a double storey extension will cost.

While every project is unique, a typical double storey extension in Dublin generally ranges between €1,200 to €2,500 per square metre, depending on factors such as:

• Extension size
• Structural complexity
• Ground conditions
• Materials and finishes selected
• Roof design
• Internal specification
• Plumbing and electrical requirements
• Planning requirements

Following your site survey, we provide a detailed quotation so you understand exactly what is included before construction begins.

Why Choose OS Holding for Your Double Storey Extension?

Choosing the right contractor is just as important as choosing the right design. A double storey extension is a significant investment, so you want a team that can manage the project professionally while keeping communication clear from start to finish.

Complete Design-and-Build Service

Instead of coordinating separate designers, builders and trades, OS Holding provides a turnkey design-and-build service. We manage every stage of your extension, helping simplify the process and reduce unnecessary delays.

A Dedicated Project Manager

Every renovation and extension project is assigned a dedicated project manager who acts as your main point of contact. You’ll always know who to speak to about progress, decisions and next steps.

Guidance Through Planning

Many double storey extensions require planning permission. Our team provides guidance throughout the planning process, helping you understand the requirements before construction begins.

Fully Insured and Professionally Accredited

When inviting contractors into your home, confidence matters. OS Holding is:

• Fully insured
• A member of the Construction Industry Register Ireland
• A member of the National Guild of Master Craftsmen
• A member of the Construction Industry Federation

Projects Tailored to Every Home

No two homes are identical, and neither are our extensions. Whether you’re extending a detached bungalow, semi-detached home or family house, every design is developed around your property’s layout, planning requirements and long-term goals.

Our Double Storey Extension Process

We believe homeowners should always know what happens next. Our structured process keeps your project organised from the initial enquiry through to completion.

1. Free Site Survey

We begin by visiting your property to discuss your ideas, assess the available space and understand your objectives. This allows us to recommend practical solutions based on your home.

2. Design and Planning

Once your requirements are confirmed, we develop a design that complements your existing property while maximising available space. Where necessary, we also provide guidance on planning permission requirements.

3. Detailed Quotation

You’ll receive a clear quotation outlining the agreed scope of work. We explain what’s included so you can make informed decisions before construction starts.

4. Construction

Our experienced tradespeople carry out the build while your dedicated project manager oversees coordination, quality control and communication throughout the project.

5. Completion and Handover

Once construction is complete, we carry out a final walkthrough with you to ensure everything has been completed in accordance with the agreed specification before handover.

Extension Ideas for Your Home

A double storey extension gives you the flexibility to redesign your entire home rather than simply adding extra square metres.

Popular combinations include:

Larger Kitchen and Dining Area

Create an open-plan kitchen with more natural light, improved storage and additional room for entertaining while using the upper floor for extra bedrooms.

Additional Bedrooms

Growing families often use a two-storey extension to add one or two bedrooms upstairs while improving shared living areas below.

Home Office

If you regularly work from home, a dedicated office can create a quieter workspace without sacrificing existing family areas.

Extra Bathroom or En Suite

Adding another bathroom can make daily life easier while improving convenience for larger households.

Family Living Space

Whether you need a playroom, snug or larger sitting room, an extension can make your home more comfortable without changing address.

Quality Construction That Complements Your Home

A successful extension should feel like part of the original property rather than an obvious addition.

Our team works carefully to ensure the extension integrates with your home’s existing character wherever possible. Attention is given to proportions, rooflines, materials and internal flow so the finished space feels natural and practical.

We also consider energy efficiency during construction through appropriate insulation, modern building methods and compliance with current Irish building regulations.

Serving Homeowners Across Dublin

OS Holding provides double storey extension services for homeowners throughout Dublin and surrounding areas.

Whether you’re planning a side extension, rear extension or a complete redesign of your home’s layout, our team can guide you through the process from the initial consultation to project completion.

Our experience across a wide variety of residential properties allows us to adapt each extension to suit the existing structure, planning requirements and your family’s needs.