Realistic Irish Renovation Timelines 2026: How Long Renovations Actually Take

The short answer

Three numbers cover most Irish renovations in 2026:

• 14–22 weeks for design, planning and BCAR Commencement Notice before anyone picks up a tool.
• 14–34 weeks on site, depending on whether you’re refreshing or restructuring.
• 4–6 weeks of snagging and Certificate of Compliance on Completion sign-off, plus a 12-month defects liability period.

Add them up and you get roughly 11 to 13 months end-to-end for a typical 3-bed semi refurbishment in Ireland. The biggest source of overrun is under-estimating the BCAR certification tail at the end — you can lose three or four weeks waiting for the Assigned Certifier to sign the Certificate of Compliance on Completion that your solicitor needs for the file. The single most under-acknowledged risk on Irish renovations in 2026 is the lead time on aluminium glazing and bespoke joinery, both of which were affected by post-Brexit customs friction and now sit routinely at 12–18 weeks.

The four phases of an Irish renovation

Every renovation, however small or large, moves through the same four phases. Each phase has its own critical path, its own risk profile, and its own set of stakeholders. Confusing them is the single commonest scheduling error Irish homeowners make.

Phase 1 — Design (typically 4–8 weeks)

The design phase covers everything from first sketch to a buildable, dimensioned drawing set. For a kitchen refurb this is 4 weeks of measured survey, conceptual layout and final specification. For a whole-house refurb with extension it’s 6–10 weeks including Building Regulations drawings, structural engineer’s calcs, BER assessment, and an outline M&E schedule.

The single biggest cause of overrun in this phase is client indecision — specifically, changing the layout once drawings are out for pricing. Every late-stage layout change costs 2–4 weeks. A useful discipline: by week 3 of design, you should have made every material and fitting decision (worktop, taps, ironmongery, paint colours). Anything you haven’t decided by then you should commit to a placeholder spec.

If you’re working with an RIAI-registered architect, the typical fee structure is 8–12% of construction cost, broken into stages: 25% on concept design, 25% on detailed design (planning), 20% on tender, 30% on construction supervision and BCAR certification. Smaller refurbs often use a fixed-fee architectural technician (€3,500–€7,500) instead.

Phase 2 — Consents and BCAR (typically 8–16 weeks)

Consents and BCAR run in parallel and feed each other’s timing. The 8-week statutory planning period is a hard outer limit… until an RFI arrives. BCAR Commencement Notice must be lodged at least 7 days before any site activity, and the Assigned Certifier must be in place before lodgement.

Plan around three overlapping clocks:

• Planning permission: 8 weeks decision + 4 weeks observation window after grant before final permission issues. Plus 2–3 weeks of validation at the front. Total: 12–15 weeks with no RFI; 18–28 weeks with one RFI. See the dedicated Irish planning permission guide for the detail.
• BCAR Commencement Notice: lodged once design is approved and the Assigned Certifier (RIAI / Engineers Ireland member) has signed up. Building Control has 14 days to validate. Allow 3–4 weeks.
• SEAI grant approval (where applicable): pre-works BER required; grant application takes 4–8 weeks; Better Energy Homes pre-approval typically 2–3 weeks; One Stop Shop projects 6–10 weeks.

Phase 3 — Tender and mobilisation (typically 4–8 weeks)

Once you have approved drawings, consents and BCAR in hand, you tender the work to contractors. Best practice is three competitive bids. The tender period itself is 3–4 weeks (contractors need time to price); decision and contract negotiation add another 1–2 weeks; mobilisation (contractor finalising programme, ordering long lead items, scaffolding, site setup) adds a further 2–4 weeks before they actually start work.

Irish contractors with Tax Clearance and a CIRI (Construction Industry Register Ireland) registration are essential for Vacant Property Refurbishment Grant projects and most SEAI grant works — many smaller contractors don’t qualify, which narrows the tender pool. Verify CIRI registration on the public register before inviting tender.

In 2026 the typical reputable Irish contractor has an order book of 10–16 weeks; the better-established firms run 18–26 weeks ahead. If a contractor can start next week, that is itself diagnostic information about their reputation.

Phase 4 — Build, snagging, Compliance certificate

The on-site phase is the visible work and the phase most homeowners focus on. After practical completion comes snagging (typically 4–6 weeks of remediation), then the Assigned Certifier’s Certificate of Compliance on Completion (2–4 weeks of paperwork and final inspections), and then the defects liability period (12 months) during which the contractor must return for any defect that emerges through normal use.

Critically, the Certificate of Compliance on Completion is the document your solicitor needs at sale or remortgage. Don’t release retention to the contractor until the Certificate has been signed by the Assigned Certifier and lodged with Building Control. Many Irish cases end up in dispute because retention was released and the certifier subsequently refused to sign.

The build phase, sub-phase by sub-phase

The on-site work, for any project from a kitchen refurb to a full house renovation, moves through the same canonical sequence of trades. The duration of each sub-phase scales with project size but the order rarely changes.

A worked example — 26-week whole-house refurb in Dublin

A representative programme for a €110,000 refurb of a 1930s 3-bed semi in Drumcondra. No extension but a full rewire, replumb, switch from oil to air-source heat pump (SEAI One Stop Shop), new kitchen and two new bathrooms, plus structural opening between kitchen and dining room. Contract under RIAI Domestic Building Contract.

• Week 1. Mobilisation, scaffolding (front and rear), skip licence from DCC, site protection film, kitchen and bathroom strip-out. BCAR Commencement Notice lodged with Dublin City Council Building Control.
• Week 2. Complete strip-out, lift floors, remove non-load-bearing wall in kitchen. Assigned Certifier first inspection.
• Week 3. Structural engineer’s steel arrives, RSJ installed between kitchen and dining. Foundations checked.
• Week 4. Existing CH system drained, oil tank decommissioning, first-fix electrics begin. SEAI inspection one (pre-works).
• Week 5. First-fix plumbing complete, first-fix electrics complete in living spaces, kitchen ceiling boarded.
• Week 6. First-fix electrics complete in bedrooms, MVHR ducting installed in voids, fire alarm wiring (Part B compliance).
• Week 7. First fix sign-off and Assigned Certifier inspection two. Begin plastering — ceilings first.
• Week 8. Plastering continues — living-room and dining walls.
• Week 9. Plastering completes upstairs (bedrooms, hall, landing).
• Week 10. Bathrooms tanked, screeded; floor screeds drying.
• Week 11. Kitchen units delivered and installed (worktop template taken end of week).
• Week 12. Bathroom 1 tiling begins; kitchen plumbing second fix; air-source heat pump installed externally.
• Week 13. Bathroom 1 finishes; bathroom 2 tiling begins; new internal doors hung; ironmongery.
• Week 14. Kitchen worktop fitted (templated week 11, 3-week lead from Cork supplier); bathroom 2 finishes.
• Week 15. Painting and decorating — bedrooms first.
• Week 16. Painting and decorating — ground floor.
• Week 17. Floor finishes — engineered oak laid downstairs; carpet upstairs.
• Week 18. Bathroom seal-out, silicone finishing; heat pump commissioned with SEAI certification; electrical certification (RECI).
• Week 19. Internal joinery touch-ups, second-fix electrics finals, kitchen island lighting. SEAI post-works BER inspection.
• Week 20. Scaffolding strikes; gutters and external paint touch-ups; site clean.
• Week 21. Practical completion inspection. Snag list issued.
• Weeks 22–25. Snagging items closed out, final clean.
• Week 26. Assigned Certifier final inspection. Certificate of Compliance on Completion signed and lodged with DCC Building Control. SEAI grant payment processed (typically 4–6 weeks after BER post-works).

Realistic budget for client float on this programme is 4–5 weeks — meaning this 26-week build is sold to the homeowner as a 30-week build. The float absorbs the predictable slippages: a 1-week steel delivery delay, a 3-day delay on bathroom tiles, a 5-day delay on worktop template-to-delivery, plus weather days through November and December, and a 7-10 day buffer for the Assigned Certifier’s sign-off process.

Lead times that drive critical path in 2026

Six items recur as critical-path drivers across Irish renovations in 2026. None of them are surprises if you order them at the right point in the programme; all of them cause significant slippage if you don’t. Post-Brexit customs friction has worsened most of these by 2–4 weeks versus 2020 baselines.

What slips most, and why

Five recurring sources of slippage account for roughly 80% of Irish renovation overruns in 2026. Naming them lets you plan contingency against each.

1. Structural surprises in period property

Pre-1963 Irish properties — especially Dublin Georgian, Victorian and Edwardian stock — routinely conceal: rotten joist ends; missing or inadequate wall ties; lath-and-plaster ceilings that can’t take downlighters; concrete floor screeds laid over inadequate DPM; failed lintels above bay windows; salts in masonry indicative of rising damp. Property-specific issues also include pyritic heave in 1990s–2007 Dublin / Meath / Kildare estates and defective concrete blocks (mica) in Donegal and Mayo properties.

Mitigation: include a 3–5 week structural contingency in the programme and a 10–12% structural contingency in the budget. Pre-renovation invasive inspections from an RIAI-listed conservation surveyor (€600–€1,100) catch 60–70% of these issues before the contractor mobilises. For pyrite or mica-suspect properties, a Home Bond inspection or county council Defective Concrete Blocks Grant Scheme assessment is essential.

2. Planning RFI / FI cycles

Where the 8-week statutory decision period would cleanly resolve a planning application, an RFI/FI request from the council suspends the clock and can add anywhere from 6 weeks to 6 months. Common RFI triggers: site notice wording defects; insufficient amenity-impact analysis; missing tree survey on a wooded plot; flood risk assessment in tidal/river zones; visual impact studies in ACAs.

Mitigation: pre-planning consultation with the council (€80–€200 fee) costs a fraction of an RFI cycle and reduces refusal rates by roughly 70% on complex schemes. RIAI-registered architects rather than draughtspersons reduce technical-RFI rates materially. The 2024 Planning Act introduced tighter validation requirements that have front-loaded some of this risk to the application date.

3. BCAR Assigned Certifier scheduling

The Assigned Certifier (typically the project architect or engineer) is statutorily required to inspect at defined stages and to sign the Certificate of Compliance on Completion at the end. Where the certifier is also acting as project supervisor under the Safety, Health and Welfare at Work (Construction) Regulations 2013, scheduling conflicts can arise.

Mitigation: confirm the Assigned Certifier’s availability and fee structure at the design stage, not the build stage. Bundle the architect, project supervisor and Assigned Certifier roles where possible — the cost saving is typically €1,200–€2,500 and the scheduling risk evaporates. Engineers Ireland and RIAI both maintain online registers of qualified practitioners.

4. SEAI grant scheduling and approval

Projects accessing SEAI grants (Better Energy Homes or One Stop Shop) have an additional approval and inspection sequence. The pre-works BER must be completed before any qualifying work; the contractor must be SEAI-registered for the specific measure; the post-works BER must show the target uplift to release the grant. Each of these steps requires an SEAI-approved BER assessor.

Mitigation: book the pre-works BER 4–6 weeks before site start. Verify your contractor’s SEAI registration for the specific measure — a contractor registered for cavity-wall insulation may not be registered for external wall insulation. Schedule the post-works BER 2–3 weeks before expected handover to avoid grant payment delay. Grant payment lands 4–8 weeks after the post-works BER is uploaded to SEAI’s system.

5. Weather and seasonality

External works (roofing, render, brickwork, external paint) are weather-sensitive. The practical Irish building season for external wet trades is April to October; November through March imposes a 15–25% loss of productive site days. Internal trades (plaster, electric, plumbing, decoration) are weather-insensitive once the shell is closed, so the seasonality risk is concentrated in the shell-and-roof window.

Mitigation: schedule the structural and envelope phases for late spring and early summer where possible. If you must start in winter, ring-fence a 2–3 week weather contingency. Heat-pump commissioning needs particular care: outside air temperature below 0°C delays commissioning by 3–7 days. Galway, Cork and the south-west have shorter productive build seasons due to Atlantic rainfall patterns — budget an extra week of weather contingency on coastal projects.

Snagging and the Certificate of Compliance on Completion

Snagging is the systematic identification and remediation of defects between practical completion and final handover. A typical 40–90 item snag list breaks down roughly: 30% decoration; 20% second-fix trades; 15% tiling and silicone; 15% kitchen; 10% bathroom; 10% electrical commissioning details.

Allocate 4–6 weeks for snagging on a whole-house refurb. After snagging is substantially complete the Assigned Certifier conducts the final inspection and prepares the Certificate of Compliance on Completion (CCC). The CCC and its accompanying Inspection Plan must be lodged with the relevant Building Control Authority within 8 weeks of completion under the BCAR 2014 procedure. Most contracts (including RIAI Domestic) operate a retention mechanism: typically 5% held back at practical completion and released only on CCC issue.

This is the most important difference between UK and Irish renovations. The CCC is not optional. Without it, your solicitor cannot produce clean title at sale, and a mortgage lender cannot lend against the property. Some lenders are now requesting CCC even on refinance applications. Retention released without CCC is, in practice, lost leverage.

The defects liability period

The 12-month defects liability period under the RIAI Domestic Contract is the legal window during which the contractor remains obligated to remediate latent defects — defects that emerge through use rather than being identifiable at practical completion. Typical latent defects include: settlement cracks above doors and windows; underfloor heating zone failures that only show in winter; drainage backups that only emerge under heavy rainfall; heat pump short-cycling that only manifests in shoulder-season conditions; gutter overflow on south-westerly storms.

Most homeowners report 4–8 latent defects in the 12 months following handover. Track them in writing (email or contract log) and request remediation through the contract administrator. If a contractor is uncooperative during the defects period, the retention provides leverage; if retention is already released, your remedies are limited to normal civil routes (Small Claims Court for items under €3,000, Circuit Court above).

How long until you can move back in?

A practical question with three answers depending on the contract terms:

• Practical Completion (PC). The formal contractual milestone where the works are sufficiently complete for beneficial occupation. Snagging is not done; CCC not yet issued. You can move in but tradespeople will be returning. 4 to 6 weeks before CCC sign-off.
• Substantial completion + clean. Snagging items remediated, deep clean done, scaffolding off. The realistic move-in date for most homeowners. Around 2 weeks before CCC.
• CCC issued + retention release. 4 to 8 weeks after PC depending on snag list size and certifier availability. The contractual end of the project and the document your solicitor needs at sale.

For renovations with extensions, most homeowners move back in at PC plus 1–2 weeks once cleaned. For whole-house refurbishments, moving back at PC is disruptive — tradespeople need access for snagging and any latent defects. Planning a 2-week buffer between PC and move-in date is a small cost for a large disruption avoided.

Frequently asked questions

How long does a typical Irish whole-house renovation take in 2026?

For a 3-bed semi-detached in Dublin or Cork, expect 24–34 weeks total from contractor mobilisation to handover. Add 14–22 weeks of pre-construction (design, planning, BCAR, tender) at the front, so the realistic gap between deciding to renovate and moving in is 38–56 weeks — roughly 11 to 13 months. Cosmetic-only refurbs (no structural alterations) compress to 10–16 weeks on site. Full structural retrofits with extensions run 32–46 weeks on site. SCSI Q1 2026 cost data shows projects with a Vacant Property Refurbishment Grant component add another 6–10 weeks for grant approval and Compliance certification.

How long does Irish planning permission take in 2026?

The statutory decision period is 8 weeks from valid application date, with a 5-week public observation window. Requests for Further Information (RFI/FI) suspend the clock and can extend the process by 2–6 months if substantial revisions are needed. Realistic timeline from architect instruction to grant of permission: 14–22 weeks for straightforward householder applications. An Bord Pleanála (now An Coimisiún Pleanála) appeals add 24–30 weeks. Section 5 Declarations are faster: 4 weeks for a definitive ruling on exempted status.

What are the longest lead-time items on an Irish renovation in 2026?

Aluminium glazing imported from UK or Italy — 12–16 weeks post-Brexit; bespoke kitchens (solid wood, painted) — 14–18 weeks from approved drawings; structural steel (fabricated and painted) — 8–12 weeks; SEAI-eligible heat pumps from registered installers — 10–16 weeks from order to commissioning; bespoke ironmongery and steel staircases — 14–20 weeks; imported Italian large-format porcelain tile — 8–12 weeks. Post-Brexit customs declarations and CE/UKCA marking confusion have added 2–4 weeks to UK-sourced items since 2022 and these delays haven't normalised in 2026.

Can I live in my house during a renovation in Ireland?

For cosmetic-only work (decoration, replumb, rewire, kitchen swap on the same footprint) — yes, with eight to twelve weeks of disruption. For structural work involving floor or roof removal — no, plan to move out for at least 10–14 weeks of the build. For whole-house renovations with extensions — moving out for the entire build is standard practice in Ireland and almost always cheaper than the cost of disrupted contractor productivity. Budget for €1,800–€3,200 per month in rental costs for a 12-week move-out window in Dublin, €1,400–€2,400 in regional cities.

Which Irish renovation projects run over schedule most often?

Four project types slip most reliably in 2026: (1) period-property refurbs (pre-1963 Dublin Georgian and Victorian stock) where pyrite, mica, dry rot, or BCAR-non-compliant historical works emerge once walls open up — typical overrun 6–12 weeks; (2) Vacant Property Refurbishment Grant projects where grant approval and BCAR certification serial dependencies stack — typical overrun 8–14 weeks; (3) renovations involving SEAI One Stop Shop heat pump and insulation packages — the grant approval and contractor scheduling adds 4–8 weeks; (4) basement and below-ground works in Dublin's high water-table soils — typical overrun 6–12 weeks. Conversely, attic conversion and bathroom refurbs finish within 5% of programme in over 80% of cases.

What does 'snagging' mean in an Irish context and how long does it take?

Snagging is the final phase of a renovation: identifying and remediating the cosmetic and minor functional defects that emerge once the contractor reports practical completion. Typical snag list on a €70,000 Irish renovation runs to 40–90 items. Allow 2–3 weeks for snagging on a kitchen or bathroom refurb, 4–6 weeks for a whole-house renovation, and a separate 12-month defects liability period during which the contractor must return for latent defects (typically 4–8 in practice). Irish convention also requires the Assigned Certifier to issue the Certificate of Compliance on Completion before retention is released — this can take a further 2–4 weeks beyond snagging.

Timelines in this guide reflect 2026 Irish renovation conditions. Regional variations are material: Dublin and Cork have longer planning queues but better contractor availability; rural Connaught and Munster have faster planning but more limited specialist trades. Confirm with your architect, contractor and council before relying on any specific figure. Explore the rest of the guides library or jump to the renovation calculator or timeline planner.