Chapter 9 of 10 · Self-build, extending and renovating · 3 of 8
Buying land to build a house: zoning, local need, the percolation test and the money
Checked 21 Oct 2026the Central Bank's mortgage measures, Revenue's rules and the scheme operators' published terms.
Buying a site: zoning, local-need rules, percolation tests, access and services, site finance and getting planning before you buy.
Check before you hire: a solicitor should be on the register kept by the Law Society of Ireland. Law Society: find a solicitor
Written in plain English for the person buying, selling or switching. This guide covers the Republic of Ireland only.
A site is only worth what you can build on it. A beautiful field with no planning permission, no road access, a failed percolation test and a right of way through the middle is worth very little. This guide lists the checks to make before you pay for land, how to structure the purchase so you are not stuck, and how the money works.
The first question: can you build here?
Two things decide it. The zoning says what the council allows on this land. Zoned residential land in a town is simple. Agricultural land in the countryside is where most self-builders look, and there the county development plan sets rules for one-off houses.
The local-need rules say who may build a rural house. Most plans allow it only for people with a link to the area: born or raised there, working there, farming there, or returning to care for family. The rules are stricter close to cities and on busy roads. A permission granted on local need usually carries a condition that you live in the house yourself for a set number of years.
Ask the council's planner before you spend a cent. Most councils offer a free pre-planning meeting. The planning permission guide covers the process.
Buy subject to planning
The safest order is:
- Agree the price with the seller, subject to planning permission.
- Sign a contract that lets you walk away if permission is refused, or that sets the closing date after the grant.
- Apply for permission in your own name, with the seller's consent.
- Complete the purchase once the final grant issues.
A solicitor (check the Law Society's register; see the conveyancing solicitor page) drafts the condition. Many sellers of rural sites agree to it, because a site with permission is worth more and they can sell it to someone else if you fail. Some sellers apply for outline permission themselves first, which tells you the council is open to a house there.
If you must buy before permission, the price must reflect the risk, and you must be able to carry the loss.
The checks before you commit
| Check | Why | Who |
|---|---|---|
| Zoning and local need | Whether a house is allowed at all | The council's planner |
| Title and boundaries | That the seller owns what is being sold, and the map matches the ground | Your solicitor |
| Rights of way | Over the site, and for the site to reach the road | Your solicitor |
| Access and sightlines | A safe entrance onto the road, with the sight distance the council requires | Your engineer |
| Site suitability assessment | Whether the ground can take a septic tank or treatment system | A registered site assessor |
| Water | A public connection, a group scheme or a well; a well needs testing | Your engineer, Uisce Éireann |
| Electricity | How far the nearest ESB line is; a long connection costs more | ESB Networks |
| Flooding | Whether the site is in a flood zone | The OPW flood maps, your engineer |
| Ground conditions | Rock, peat or soft ground change the foundation cost | Your engineer, a trial hole |
| Trees, hedges and habitats | Protected trees or a habitat can limit where you build | Your designer |
| Archaeology | A recorded monument nearby adds conditions | The council's heritage officer |
An engineer or building surveyor (Engineers Ireland or the SCSI; see the structural survey page) does most of the physical checks. Pay for them. A trial hole costs a few hundred euro and can save you tens of thousands in foundations.
The percolation test
A site suitability assessment is required with any planning application for a house that is not on a public sewer. A registered site assessor digs trial holes, tests how fast water soaks away (the percolation test), checks the water table and the bedrock, and writes a report under the EPA's code of practice. The report says whether the site can take a conventional septic tank, a treatment system, or nothing. A site that fails cannot take a private wastewater system, and in most cases cannot get permission for a house. Do this test before you commit to the price. It typically costs a few hundred euro.
Access and the road
The council will refuse a house whose entrance is unsafe. The rule is sight distance: how far a driver pulling out can see in each direction. On a national road, new entrances are mostly refused. On a county road, you may need to cut back a hedge, set back a wall, or move the entrance. Make sure the land for the sightlines is yours, or that the neighbour has agreed in writing.
If the site is reached over someone else's lane, you need a registered right of way. A right of way "by long use" is not enough for a lender.
Services and connections
Add the cost of connections to the price of the site. A site beside a public water main, a sewer and an ESB pole is cheaper to build on than a site a kilometre from any of them. Ask each utility for a connection quote before you buy. A well costs money to drill and must be tested; a treatment system costs more than a septic tank and needs servicing.
The money
Lenders rarely lend on a site alone. The usual route is a self-build mortgage that covers the site and the build together, agreed once you have full planning permission, with the site released as the first stage. The Central Bank limits apply to the whole loan: up to 4 times income and 90% of the cost for a first-time buyer, 3.5 times for others. If you already own the site, or it is gifted, its value counts towards your deposit at most lenders. The self-build mortgage guide explains the stages and the certificates.
Until permission is in, the site is usually bought with savings, a gift, or a personal loan. A personal loan costs more than a mortgage and the repayments count against you when the lender tests your income later.
Some councils sell serviced sites in towns at a discount to people who will build and live there, under the Ready to Build scheme. Ask your council whether it has any.
A site from family
Many rural self-builders get the site from a parent. It is a gift, and two things follow:
- The lender needs a gift letter and a valuation, and treats the site value as your deposit.
- Capital acquisitions tax may apply above the lifetime threshold from a parent to a child; most sites fall inside it, but your solicitor checks. Revenue's gift tax page is in the sources.
The transfer still needs a solicitor, a map, and registration with Tailte Éireann.
Stamp duty on land
A bare site is non-residential property for stamp duty. The non-residential rate applies on the full price: 7.5% at the last check, on Revenue's page; confirm it with your solicitor. On a €100,000 site that is €7,500, far more than the 1% on a home. Where a site is bought with a building contract from a connected builder, Revenue treats the two together differently; ask your solicitor which applies. The stamp duty guide covers the rates on homes.
A worked example
Eoin finds a half-acre site on a county road for €90,000. The seller agrees to a sale subject to planning. Eoin pays an assessor €500 for a site suitability assessment, which passes for a treatment system. His engineer checks the sightlines and finds the hedge needs cutting back on land that is the seller's; the seller agrees in writing. ESB Networks quotes a connection, and the nearest water main is 200 metres away. Eoin applies for permission, which is granted with a local-need condition and a development contribution of a few thousand euro. He completes the purchase: €90,000 plus stamp duty of €6,750 at 7.5% and his solicitor's fee. The site then goes into his self-build mortgage as the first stage.
Where this leaves you
Add the site price, the connections and the build to the self-build mortgage calculator to see the loan as a whole. The self-build journey puts the site checks first, and you can get quotes for the solicitor who drafts the subject-to-planning contract.
Questions people ask
Can I get a mortgage to buy a site in Ireland?
Rarely on its own. Most lenders lend on a site only as part of a self-build mortgage, with full planning permission in place, and release the site money as the first stage. A site without permission is usually bought with savings, a gift or a personal loan.
What is a percolation test?
A test of how well the ground soaks up water, done as part of a site suitability assessment for a septic tank or treatment system. A site that fails cannot take a private wastewater system and may not get planning permission for a house.
What are the local need rules for building in the countryside?
Most county development plans allow a one-off rural house only for people with a link to the area: born or raised there, working there, or farming there. The rules vary by county and by how close the site is to a town. Check the plan and ask the planner.
How much is stamp duty on a site?
A bare site is non-residential property, and the non-residential rate applies: 7.5% at the last check, on the full price. A site bought with a building contract from the same developer is treated differently. Confirm the rate on Revenue's page and with your solicitor.
Should I buy a site before I have planning permission?
Only if you can afford to lose the money or the price allows for the risk. The safer order is to agree the price subject to planning, apply, and complete the purchase once permission is granted. Many sellers of rural sites agree to this.