Composite Decking Dublin: Prices, Composite vs Timber & What Actually Lasts in Irish Weather (2026)

Twenty years ago when I started building decks across Dublin, almost every job was treated timber. It was what people knew, what was affordable, and what looked great on day one. The problem was what happened after the first two or three Irish winters.

Boards warped. Surfaces turned slippery. Homeowners who had not kept up with staining and sealing were left with decks that looked twice their age. I spent a lot of those early years fixing decks that should have been built differently in the first place.

That experience is why I want to give you a straight, honest guide to composite decking in Dublin — real prices, real comparisons, and the specific things that matter when you are building something that has to survive our climate. Not a showroom pitch. Just what I have learned from two decades of doing this work across every type of Dublin garden.

Composite Decking Prices Dublin — Quick Summary (2026)

Before going into the detail, here are the current prices we charge at Reflect General Maintenance for decking installation in Dublin.

Table 1 — Decking Price by Type

Table 2 — Estimated Total Cost by Project Size

What Affects The Cost of Decking in Dublin?

No two decking projects are exactly the same. Here are the five main factors that influence what you will pay.

1. Ground Level and Preparation

A flat garden on level ground is the most straightforward and least expensive to deck. Sloped or uneven gardens — which are common across North Dublin housing estates — require additional groundwork to level the substructure. This is not a reason to avoid decking a sloped garden — it is just a factor that adds to the labour cost and should be assessed on site.

2. The Size and Shape of The Deck

A straightforward rectangular deck is faster to build and cheaper per m² than a complex shaped deck with angles, multiple levels, or integrated steps. Raised decks with safety railings also add material and labour cost compared to low-level ground decks.

3. The Material You Choose

Composite boards carry a higher upfront cost than treated timber but a lower maintenance cost over the lifetime of the deck. The right choice depends on your budget and how much time you realistically want to spend on annual upkeep. I discuss this in detail in the comparison section below.

4. Extras — Lighting, Railings, Planters

Integrated LED step lights, built-in planters, and powder-coated railings all add to the total cost but can transform how the space looks and how it gets used through the year. These are assessed and quoted separately during the design visit.

5. Access to Your Garden

Narrow side passages, gates that limit equipment access, and gardens backing onto other properties all affect how materials are brought in and how long the job takes. Difficult access adds time and therefore cost to any project.

Composite vs Timber Decking — Full Comparison For Dublin Gardens

This is the most important decision you will make on your decking project and I want to be direct about it rather than push you toward the more expensive option.

Full Comparison — Composite vs Timber vs PVC

When Composite Makes More Sense

If you are building a deck you want to use for the next 20 years with minimal effort, composite is almost always the better choice for Dublin gardens. The key reasons are moisture resistance and slip safety. Dublin's rainfall is persistent and heavy for much of the year — composite boards are engineered specifically to handle this without warping, splitting, or becoming dangerously slippery underfoot.

Families with young children or older relatives who use the garden year-round will often find the slip resistance advantage alone makes composite worth the extra upfront cost.

Over a 15 to 20 year period, when you factor in the annual staining and sealing timber requires — plus the cost of replacing boards that have not been maintained — composite often works out comparable or cheaper in total spend.

When Timber Still Makes Sense

Treated timber is not a poor choice — it is simply a different commitment. If your budget is firm and you are realistic about maintaining the deck every one to two years, treated hardwood or pressure-treated softwood will perform well in Dublin's climate and looks genuinely beautiful when properly cared for.

We use quality pressure-treated timber rated for outdoor use in Ireland, not the cheaper grades that struggle after the first wet winter. If you go with timber and keep up the maintenance, you will have a deck that lasts.

Kirk's Honest Recommendation

After 20 years of building and repairing decks across Dublin I see more calls about timber decks that have been neglected than any other issue. Not because the material is bad — because people underestimate how consistent Irish weather demands you to be with maintenance.

If you are the type who will sand, stain and seal every 18 months without fail, timber is a fine choice and will save you money upfront. If you want to build something and not think about it again for 15 years, composite is worth the extra investment.

Real Job Example — Decking Installation in Portmarnock

Earlier this year we were called out to a detached home in Portmarnock. The homeowner had a large south-facing back garden and an existing timber deck that had seen better days — boards lifting in several places, one joist cracked underneath, and the surface so weathered and slippery it had not been used safely in two years.

Rather than patch what was there, we recommended a full replacement. The existing structure was removed, the ground underneath was levelled and compacted with a gravel base, and a new subframe was built with correct drainage gaps and joist spacing for the Irish climate.

We installed composite decking boards across a 28m² area with two integrated steps down to the garden lawn and a low-level railing along one side.

The homeowner now has a deck they use through most of the year, including on dry winter afternoons when the Irish weather allows. No maintenance required beyond an occasional wash — which ties in neatly with our pressure washing service if they want a professional clean each spring.

Does Decking Need Planning Permission in Dublin?

This question comes up on almost every quote visit and the answer depends on the specific project. Most standard residential decking in Dublin falls under exempted development — meaning no planning permission is required — provided certain conditions are met:

• The deck does not significantly raise the ground level above the original garden
• Total covered area does not exceed a set percentage of the original garden
• The deck is not close to a public road or within a restricted boundary area
• The structure is not attached to the front of the house

Where projects are more likely to need planning permission:

• Raised decks above a metre in height — deck height above ground level triggers planning review in most Dublin areas
• Decks covering large portions of the garden — coverage percentage rules apply regardless of the size of the structure
• Properties within conservation areas or those with existing planning conditions already attached
• Decks built close to boundary walls shared with neighbouring properties

We assess planning permission requirements during your free design visit and will flag clearly before any work starts if your project needs an application. We will not begin a project that creates problems for you further down the line.

For larger or more complex garden projects, our garden layouts service covers integrated design across decking, planting, and paving — worth discussing if you are planning a full garden transformation rather than a deck alone.

Decking Repairs and Cleaning Dublin — When You Do Not Need a Full Replacement

Not every decking problem requires starting from scratch. If your existing deck is structurally sound but showing surface wear, we carry out repairs and cleaning that can extend the life of a deck significantly.

What decking repairs cover:

• Replacing lifted or split individual boards
• Repairing or replacing cracked and damaged joists
• Resecuring boards that have worked loose from fixings
• Replacing broken or missing balustrade sections

What decking cleaning covers:

Green algae and moss buildup on timber decks is one of the most common issues we see across Dublin gardens — particularly on north-facing decks that get less sun. A professional clean using the correct lower-pressure technique removes the buildup without damaging the board surface, restoring both the appearance and slip safety in one visit.

If your deck is slippery underfoot and looking neglected but the structure underneath is still solid, a professional clean is often all that is needed before the season rather than a full replacement. See our pressure washing Dublin page for full details on deck cleaning pricing.

What to Watch Out For When Hiring a Decking Contractor in Dublin

After two decades in this trade I have seen homeowners caught out by poor work that looked fine on the day and only revealed its problems after the first winter. Here is what to be cautious of before you agree to anything.

• No subframe inspection before quoting — a contractor who gives a price without assessing the ground underneath is guessing at the most important part of the job.
• Unusually low per-m² prices — below-market pricing on composite decking almost always means cheaper boards, inadequate joist spacing, or skipped drainage details.
• No written quote provided — verbal agreements on jobs of this scale create disputes. Always get the full scope in writing before work starts.
• Pressure to skip planning assessment — any contractor who says planning permission definitely does not apply without seeing your specific garden is making a guess that could create problems for you.
• No evidence of completed work — ask to see completed Dublin projects, photos, or reviews from real customers. 20+ years in Dublin means there are plenty of finished jobs to point to.

What to look for instead:

• Free design visit with proper ground assessment included
• Written itemised quote covering materials and labour
• Planning permission discussed and assessed upfront
• Verified Google reviews from Dublin homeowners
• Public liability insurance confirmed before work starts