A house renovation in Ireland takes anywhere from three weeks for a single bathroom to fifteen months for a full house combined with an extension. The build itself is rarely the longest part. Planning permission, building control notifications, material lead times, and contractor availability regularly add months before a single tool arrives on site. Understanding both timelines, the pre-build phase and the build phase, is the difference between a project that runs smoothly and one that stalls before it starts.
Renovation Timelines by Project Type
The table chart shows pre-build and on-site durations for the most common renovation types in Ireland. Pre-build times assume planning permission is required where noted. Projects in Dublin can run at the upper end of these ranges due to contractor demand and access constraints on terraced properties.
Pre-build phase includes structural survey, design and drawings, planning permission where required, Commencement Notice, contractor selection, and long-lead material ordering. On-site phase runs from groundworks or strip-out to snagging sign-off. Dublin projects typically run at the upper end of these ranges due to contractor demand and access constraints on terraced properties. Planning permission adds 8 to 12 weeks to the pre-build phase where required. Properties built before 1960 should assume upper-end timelines throughout.
The Two Timelines Every Irish Homeowner Needs to Understand
Every renovation in Ireland has two distinct timelines. Most homeowners only plan for one of them.
The Pre-Build Phase
The pre-build phase covers everything that happens before work starts on site: structural survey, design and architectural drawings, planning permission if required, Commencement Notice submission, contractor selection, quoting, and ordering long-lead materials. For a straightforward bathroom renovation, this phase might take two to four weeks. For a house extension requiring full planning permission, it regularly runs to five or six months.
The most common mistake Irish homeowners make is contacting a contractor in January and expecting to start in February. By the time surveys are done, drawings are agreed, quotes are compared, and materials are ordered, April or May is more realistic for a project of any real scale. Planning this phase properly, and starting it earlier than feels necessary, is the single most effective thing a homeowner can do to keep a renovation on schedule.
The Build Phase
The build phase is what most people mean when they ask how long does house renovation take. It is the on-site construction period from the day the contractor arrives to the day the snagging list is signed off. This varies enormously by project type, and the figures in the section below reflect real-world Dublin timelines, not optimistic estimates.
Bathroom Renovation Timeline
A straightforward bathroom renovation on a Dublin semi-detached, full strip-out, new tiling, sanitary ware, and heated towel rail, takes 7 to 10 working days on site with an experienced team. That is one and a half to two calendar weeks from start to finish line. The pre-build phase is short: two to four weeks to agree scope, get quotes, and order sanitaryware and tiles, which often have lead times of two to three weeks for less common formats or special orders.
The jobs that take longer are those where the strip-out reveals problems. Failed tanking, cracked soil pipes, or substandard first fix from a previous renovation all add time. In older Dublin properties, particularly pre-1970s terraces and semis, assume the bathroom will reveal at least one unexpected issue. Budgeting two weeks on site rather than one is the prudent approach.
Kitchen Renovation Timeline
A kitchen renovation is more time-sensitive than most homeowners expect, primarily because of kitchen unit lead times. Standard ranges from Irish suppliers typically run 6 to 8 weeks from order to delivery. Bespoke or semi-custom kitchens can run to 10 to 12 weeks. If you order the kitchen before finalising the layout, or before the contractor has confirmed first fix positions, you risk ordering units that do not fit the actual space.
The correct sequence is: agree layout, complete first fix plumbing and electrical, then order units. This means a kitchen renovation cannot realistically be started and finished in a month unless units are already on order or being sourced from a supplier with stock. On site, a standard kitchen installation takes two to four weeks from unit delivery to completion, depending on the complexity of the layout and the extent of structural works such as wall removal.
Allow 6 to 14 weeks total from the decision to start to the day you cook a meal in the finished kitchen. Projects involving wall removal, structural steelwork, or a connection to an extension will sit at the upper end.
Attic Conversion Timeline
An attic conversion is one of the most contained renovation types in terms of disruption, but it is not the fastest. The pre-build phase for a dormer conversion typically runs 4 to 8 weeks: a structural engineer must assess the roof, drawings must be prepared, a Commencement Notice submitted, and Velux or dormer windows ordered (8 to 12 week lead times are common for certain specifications).
On site, a rooflight conversion on a standard semi-detached takes 6 to 8 weeks. A dormer conversion with an en suite runs 8 to 10 weeks. A hip-to-gable conversion, which requires planning permission in most cases, adds the planning phase to the pre-build timeline and typically runs 10 to 14 weeks on site. Total timeline from first conversation to finished attic room: 3 to 5 months for a rooflight, 5 to 7 months for a dormer with planning.
Single-Storey Extension Timeline
A single-storey rear extension is the most common renovation project in Dublin, and the one with the most variable timeline. If the extension qualifies as exempted development, the pre-build phase is 2 to 3 months: survey, drawings, Commencement Notice, contractor selection, and groundworks preparation. If planning permission is required, add 8 to 12 weeks for the planning process alone, taking the pre-build phase to 4 to 5 months.
On site, a 20 to 30m² single-storey rear extension in Dublin takes 10 to 16 weeks from groundworks to snagging. The key stages are groundworks and foundations (2 to 3 weeks), structural frame and roof (3 to 4 weeks), first fix trades (2 to 3 weeks), insulation and plastering (2 to 3 weeks), and second fix, tiling, and finishing (3 to 4 weeks). Bad weather delays groundworks and roofing. Trade sequencing delays compound quickly when one contractor runs late. A realistic total timeline for a standard Dublin rear extension is 5 to 9 months from the initial decision to move to practical completion.
Two-Storey Extension Timeline
A two-storey extension almost always requires planning permission, which shifts the pre-build phase to 3 to 6 months before work can begin. On site, a standard two-storey rear extension takes 14 to 20 weeks, sharing many of the same stages as a single-storey but with additional structural complexity, a longer roofing phase, and more first fix work across two floors.
The total realistic timeline for a two-storey extension in Dublin, from the first conversation with an architect to the day you move furniture into the new rooms, is 7 to 12 months. For homeowners planning a two-storey extension alongside other renovation works, see the full house extension cost and process guide.
Full House Renovation Timeline
A full house renovation, covering structural works, rewiring, replumbing, new kitchen, new bathrooms, insulation, plastering, flooring, and decoration throughout, is the most complex project type and the one most commonly underestimated for time. The pre-build phase runs 2 to 4 months: a full structural survey, a detailed specification from an architect or project manager, multiple trade quotes, SEAI grant applications for any energy measures, and material ordering.
On site, a full renovation of a typical three-bed Dublin semi-detached takes 3 to 6 months depending on the scope and the condition of the property. Older properties in poor condition sit at the upper end. Properties built after 1990 in reasonable structural condition sit at the lower end. The total realistic timeline is 5 to 10 months from decision to handover. For properties built before 1960, assume the upper end of every range until a structural survey confirms otherwise.
What Planning Permission Does to Your Timeline
Planning permission is the single biggest variable in an Irish renovation timeline. Whether your project requires it, and how smoothly the process runs, can add anywhere from two months to over a year to the total programme.
Exempted Development: Minimal Delay
Many common renovation works in Ireland do not require planning permission. Single-storey rear extensions up to 40m² on a house with no previous extensions, rooflight attic conversions, most internal works, and bathroom and kitchen renovations that do not affect the external appearance of the property all generally qualify as exempted development.
Even without planning permission, a Commencement Notice must be submitted to your local Building Control Authority before significant works begin. This is a straightforward administrative step that typically takes one to two weeks and should be handled by your architect or contractor as a matter of course.
Full Planning Permission: 8 to 12 Weeks Minimum
When planning permission is required, the statutory decision period is 8 weeks from the date the planning authority validates the application. In practice, Dublin local authorities, covering Dublin City Council, South Dublin County Council, Dún Laoghaire-Rathdown County Council, and Fingal County Council, regularly use the full 8 weeks and sometimes request further information, which resets the clock and adds further weeks to the process.
The pre-application phase, preparing drawings, site notices, design statements, and any required reports, typically takes 4 to 6 weeks with an experienced architect. A planning application that is well-prepared and clearly within the planning authority’s policy framework is decided faster and with fewer requests for further information than one submitted without adequate preparation.
Third-Party Objections and An Bord Pleanála
Any third party, including a neighbour, can lodge an objection to a planning application within five weeks of its submission. If the planning authority grants permission and a third party appeals to An Bord Pleanála, the appeal process adds a further 4 to 6 months to the timeline. Appeals to An Bord Pleanála are relatively uncommon on standard residential extension applications but do occur, particularly in protected structure cases and high-density areas.
How to Reduce Planning Delays
The most effective way to reduce planning delays is to use an architect with direct experience of the specific local authority your property falls under. Dublin City Council and Dún Laoghaire-Rathdown County Council have different priorities, different standard conditions, and different interpretations of development plan policies. An architect who has submitted multiple successful applications to your specific council will produce a more targeted application that is less likely to generate a request for further information.
A pre-application consultation with the planning authority, available for more complex or borderline projects, can also identify issues before a formal application is submitted, saving both time and money.
The Factors That Cause Irish Renovations to Run Late
Over 16 years of renovation work in Dublin, the causes of delays are consistent across projects. None of them are unpredictable, and most of them are avoidable with proper planning.
Contractor Availability
Reliable Dublin contractors are typically booked 8 to 16 weeks in advance. Starting your search for a contractor at the same time as you submit your planning application, rather than waiting for permission to be granted, means you are ready to go the moment you have approval. Homeowners who wait until planning is granted before contacting contractors add two to four months to their programme unnecessarily.
The same applies to specialist trades: structural engineers, RECI-registered electricians, and RGI plumbers all have waiting times. A main contractor who manages their own subcontractor relationships, rather than sourcing trades on the open market for each project, will produce a more reliable programme. For guidance on finding and vetting the right contractor, see our guide on how to find a reliable builder.
Material Lead Times
Several key materials have lead times that can hold up an entire programme if not ordered early enough.
Order before work starts, not when you think you need it. A kitchen renovation that begins on site without units already on order will have a 6 to 10 week gap mid-programme. Work backwards from the date each item is needed on site and place orders before the first trade arrives.
Lead times are indicative for the Irish market in 2026 and vary by supplier, specification, and demand. Non-stock tile formats, custom sanitaryware colours, and bespoke joinery will sit at the upper end or beyond. Structural steel lead times assume standard section sizes. Always confirm lead times with your supplier at the point of order and factor delivery slots into the contractor programme.
The rule is simple: order long-lead items before work starts, not when you think you need them. A kitchen renovation that starts on site without the units already on order will have a two-month gap in the middle of the programme while the units are manufactured. That gap costs money in retained trades and lost momentum.
Unexpected Structural Issues
Pre-1970s Dublin properties, particularly Victorian and Edwardian terraces in areas like Ranelagh, Rathmines, and Drumcondra, regularly reveal hidden structural problems once walls, floors, and ceilings are opened. Failed lintels, rising damp, cracked foundations, compromised roof timbers, and outdated wiring are all common findings that cannot be identified until the strip-out is underway.
Each unexpected issue requires an engineer’s assessment and a solution before work can continue. This is not a failure of planning. It is an inherent characteristic of working in older buildings. It is why a 15 to 20% contingency is essential on any project in a pre-1960s property, and why a structural survey before work starts is worth every cent.
Sequential Trade Dependencies
A renovation follows a strict sequence. First fix plumbing and electrical must be inspected and signed off before walls are closed. Plaster must be applied and dried before flooring. Wet trades must finish before dry trades begin. Each dependency is a potential delay if one trade runs late or is unavailable.
The risk is compounded when a main contractor is sourcing individual trades on the open market rather than managing a consistent team. If the electrician runs three days late, the plasterer cannot start, and the knock-on effect ripples through every subsequent trade. A contractor who manages their own trade team, or has established relationships with reliable subcontractors, produces a more predictable programme than one assembled from individual quotes.
Bad Weather
Groundworks, roofing, and any external works are weather-dependent. An Irish winter adds genuine and unavoidable risk to any project with significant external elements. Groundworks that would take two weeks in dry conditions can stretch to four or five in a wet January. Roofing cannot proceed safely in high winds. External wall insulation requires dry conditions for the render to cure correctly.
The practical implication: if your project involves significant external works, aim to have the building watertight before November. A project that starts groundworks in October is taking a risk that a project that starts in March is not. Discuss weather risk explicitly with your contractor when agreeing the programme, and ensure the contract includes provisions for weather delays.
How to Keep Your Renovation on Schedule
Start Contractor Conversations Earlier Than Feels Necessary
The right time to start talking to contractors is at the same time as you engage an architect, not after drawings are complete. A good contractor, approached early, can input on design decisions that affect buildability and cost. They can also tell you their availability and give you a realistic programme before you have committed to a timeline. Approaching contractors only after drawings are finalised and permission is granted puts you at the back of a booking queue that may already be four to six months long.
Order Long-Lead Items Before Work Starts
Once your contractor programme is agreed, identify every item with a significant lead time and place orders before work begins. Kitchen units, windows, doors, specialist tiles, and attic windows should all be on order before the first trade arrives. Your contractor should be able to tell you exactly when each item is needed on site, and you should work backwards from that date to determine the order date.
Agree a Written Programme Before Signing the Contract
Every building contract should include a written programme showing the sequence of works, the start and end date for each stage, and the overall completion date. Without a written programme, there is no agreed baseline to measure progress against and no mechanism to identify delay early enough to take corrective action. A contractor who is reluctant to commit to a written programme is worth questioning before you sign anything.
Make Decisions in Advance, Not on the Fly
Every decision made during a live project takes longer than the same decision made before work starts. The tile you cannot decide on holds up the tiler for two days. The worktop finish you change after the units are fitted costs money and time. The light fitting position you want to move after first fix means opening a wall. Decisions made before work begins cost nothing. The same decisions made during the build are some of the most expensive hours of the project. Walk through every room, every finish, and every fitting choice with your contractor before work starts and commit everything to writing.
Build Float Into Your Timeline
Add a minimum of two to three weeks of float to any renovation programme of significant scale. Float is not the same as contingency budget. It is reserved time in the programme for the delays that are certain to happen but impossible to predict exactly. A project planned to finish in twelve weeks should be communicated to family, employers, and anyone else affected as taking fourteen weeks. The two weeks of float absorbs delays without causing stress. If the project finishes in twelve weeks, the float is simply unused.
