Buying property Archives - BCE Consulting

Buying a House With No Planning Permission For An Extension

by Stephen Michael Boyle | Jun 10, 2026 | Buying property, planning permission

You find the house. It’s a Victorian terrace in one of Cork city’s older neighbourhoods, Shandon, Sunday’s Well, the Lough, with a rear extension that gives it the extra space you need. You love it. You put in an offer. It’s accepted. Then your solicitor asks a simple question: is there planning permission for that extension?

If the answer is no, or “we’re not sure”, the transaction just got more complicated.

This is one of the most common issues we flag in pre-purchase surveys of older Cork properties. It does not automatically mean you should walk away, but it does mean you need to understand what you’re dealing with before you sign anything.

What does “no planning permission” actually mean?

Not every extension needs planning permission. Under Irish planning law, smaller works can qualify as exempted development, meaning they can be carried out without applying to the local authority. For a terraced or semi-detached house, the exempted development limit for a rear extension is 12 square metres. For a detached house, it is 40 square metres.

If an extension falls within those limits and meets the other conditions set out in the planning regulations, it is technically fine without permission.

The problem is that a lot of extensions on older Cork properties don’t fall within those limits. A generous rear kitchen extension, a side return infill, a two-storey addition: these are the kinds of works that would have required planning permission. And in many cases, particularly in houses built before the 1980s, that permission was never sought. Owners extended their homes in good faith, often decades ago, without fully understanding the rules at the time.

Why is this particularly common in Cork city?

Cork city has a significant stock of older terraced housing, particularly in areas like Shandon, Blackpool, Sunday’s Well, Ballintemple, and parts of the southside. Many of these homes date back to the Victorian and Edwardian eras, and they have been extended, modified, and altered by successive owners over more than a century.

Cork City Council holds a “Blue Book“, a record of planning permissions granted from the 1960s through to the 1990s, but a lot of the extensions you will encounter on older city properties predate even that record, or were added informally during a period when planning enforcement was far less routine than it is today.

It is also worth noting that many older parts of Cork city fall within Architectural Conservation Areas. Works carried out in these areas can require planning permission even when they might otherwise qualify as exempted development elsewhere. If you are buying in a conservation area, this is something to check carefully.

What are the risks for the buyer?

This is where it gets important. Under Irish property law, the principle of caveat emptor applies. In plain terms, that means “buyer beware.” Once you sign contracts, you are taking the property as it is, including any planning issues that were there to be found.

The risks of proceeding with an unauthorised extension without addressing it include:

Mortgage lender concerns. Many lenders will not advance funds on a property with an unresolved planning issue. Your bank or mortgage provider may require evidence that the extension is either exempted development or has been regularised before they will release funds.

Title issues. Your solicitor will raise a planning query as part of the conveyancing process. If the seller cannot provide evidence that the extension is in order, this can delay or derail the sale entirely.

Difficulty reselling in future. What is a problem for you now will be a problem for the next buyer too. Leaving an unauthorised extension unresolved does not make it go away; it just passes the issue down the line.

Enforcement action. Cork City Council and Cork County Council both have the power to issue enforcement notices requiring works to be demolished or altered. While enforcement action on older extensions is relatively uncommon, it is not unheard of, and it is a risk you would be taking on as the new owner.

Insurance implications. Some insurers may be reluctant to provide full cover for an unauthorised structure or may exclude it from a claim.

Can retention planning permission solve the problem?

In many cases, yes. Retention planning permission, sometimes called retrospective planning permission, allows an owner to apply for permission after the fact, regularising a structure that was built without it.

If the extension is structurally sound, does not breach the development plan for the area, and has not caused significant harm to neighbouring properties, retention permission is often granted. Cork City Council and Cork County Council both process retention applications as part of their standard planning functions.

However, retention is not a guaranteed outcome. An extension that significantly exceeds the allowable limits, is located in a sensitive conservation area, or has caused genuine amenity issues for neighbours may not get permission. It also takes time, typically a number of months from application to decision, which can complicate the timeline of a purchase.

If retention is a condition of the sale, it is generally advisable to either have the seller apply for it before contracts are exchanged, or to negotiate a price reduction that reflects the cost and risk of dealing with it yourself.

What does a pre-purchase survey pick up that a solicitor won’t?

Your solicitor will raise a planning query in the course of the conveyancing process, but their role is to review documentation. If there is no planning file for an extension, they can flag its absence. What they cannot do is assess the physical structure itself.

That is where a pre-purchase survey comes in. A structural engineer will examine the extension on site and can identify signs that a structure was built without proper oversight: walls that do not match the construction method of the original house, roof tie-ins that are poorly detailed, a lack of cavity wall insulation where modern standards would require it, or structural elements that were not designed by an engineer.

This matters because an unauthorised extension is not just a planning problem. It can also be a structural one. Knowing what you are dealing with before you commit gives you options: you can negotiate, you can ask the seller to regularise it, or in some cases you can make an informed decision to walk away.

We have carried out hundreds of pre-purchase surveys across Cork city and county, and planning issues with rear extensions are among the most common findings, particularly in the older terraced housing that makes up so much of the city’s residential stock.

Should you walk away?

Not necessarily. An unauthorised extension is a problem that can, in many cases, be resolved. What matters is that you know about it before you sign contracts, not after.

If you are buying a property in Cork and want an independent assessment before you sign anything, get in touch with our team today.

Buying a Period Property in Ireland: What You Need to Know Before You Sign

by Stephen Michael Boyle | Mar 30, 2026 | Buying property, pre purchase survey

With Cork’s rich history and its modern appeal, it should come as no surprise that many individuals are looking into buying a period property in Ireland. Many historic homes in Cork City and County are indeed quite charming, and living in them can give homeowners a sense of permanence, being rooted firmly in the land and history of an area in a way that many new builds may not.

There’s nothing quite like the lovely Georgian terraces on Patrick’s Hill or the Victorian redbrick houses in Ballintemple, or the intricate fireplaces, sash windows, or tall ceilings common in many period homes, estates, and farmhouses dotted throughout Co Cork.

While it may feel romantic, just as we often romanticise the past, it’s often through rose-coloured lenses, and there are several real risks to consider with period homes in Ireland. You’ve got to remember that these homes were built a long, long time ago, when building standards differed an awful lot from ours today.

Moreover, they’ve often been patched up and repaired, modified, or altered over the decades or even centuries, and they may have been left neglected for long periods before being repurposed. They might look beautiful from the outside, but underneath the plaster may lie unanticipated issues.

What Is a Period Property?

A period property in Ireland refers to an old home reflecting Cork’s history and character, usually from the past three centuries. Generally, a period house in Cork will fall into one of three historical periods:

Georgian (1714-1830): these homes tend to be spacious and elegant, with features like symmetrical terraces, generous use of limestone and sandstone facades, large sash windows letting in plenty of natural sunlight, and high ceilings. You’ll find a few beautiful examples in Cork City, particularly near Patrick’s Hill, South Mall, and Bachelor’s Quay, as well as in the countryside as estate homes.
Victorian (1837-1901): by far the most common by its abundance in Cork and elsewhere in Ireland and in the UK. Its style typically is much more decorative than Georgian, with tall, thin, symmetrical terraces being the norm, as well as bay windows, steep slate roofing, and ornate bargeboards. You’ll see this style pretty much everywhere, but a good example can be found on Victoria Road in the city.

Edwardian (1901-1914): these homes tend to look quite similar to Victorian homes, especially in the latter years of the Victorian style. They can be identified by their similarity to the Victorian style (bay windows, etc.), they tend to be more spacious and lighter, more comfortable inside. You can find great examples of the Edwardian style in the Victorian Quarter (yes, many are late Victorian, early Edwardian) around MacCurtain Street in Cork City.

Why Period Properties Need Extra Scrutiny

A period house in Ireland can (and even should) look charming from the outside, but buying a period home in Cork should always be done with extra scrutiny. The thing is, these homes are so old that they may be riddled with problems, many of which could be very costly to repair.

They were often built when building regulations differed greatly from what we use today, and they may have been built long before our building code existed. Yes, they’re still standing tall on our streets and in our lovely countryside, but they often suffer from defects like damp waterproofing courses, a lack of adherence to fire safety standards (i.e. they could pose a serious fire hazard), or they were built with materials and techniques that modern tradespeople no longer know how to assess or repair. For this last point, things like natural slate or old pre-standard timber require highly specialised tradespeople, so assessments and repairs can be time-consuming and expensive as a result.

You should also consider that Cork’s maritime climate and heavy annual rainfall mean that these houses experienced accelerated wear and deterioration, especially their roofs, chimneys, and exterior walls. If they haven’t been properly maintained up until the current day, they could have accumulated several defects, including dangerous structural defects.

A period property in Ireland will likely have had several previous owners over time, some of which may have performed DIY repairs with varying results or modifications without planning permissions.

As a homebuyer in Ireland, you are subject to the principle of caveat emptor “buyer beware.” Once you’ve signed the final purchase contract, any such problems in the period home fall upon you.

The Most Common Problems Found in Period Properties

Homes built a lifetime ago can have several problems, so just imagine how many could be hidden away in a centuries-old period home. Below are some of the most common problems one may find in period properties in Cork:

Damp

By far the biggest issue, especially here in Cork and in homes along the waterfront, is damp. Many old homes were built without any damp-proof courses at all, so things like rising damp, penetrating damp, or excessive condensation are quite common. Moreover, you’ll usually find that the damp is locked away behind the plaster walls or under the flooring.

The first telltale sign of damp, other than simply feeling it, is seeing debonded plaster. In Cork’s maritime climate, this is far more common than elsewhere in Ireland.

Roof and Chimney Problems

While period homes often feature lovely slate roofs, slate itself can be quite a challenging material to work with. Parts of the roof such as its steepness (common in Victorian and Edwardian homes), cracked or missing slate tiles, sagging timbers, or deteriorating chimney stacks are all quite commonly found.

Original Valentia slate or even Welsh slate was (and still is today) a natural material, but one that is vulnerable. Synthetic slate just didn’t exist back then, so you’ll need to find knowledgeable, specialised tradespeople, which in turn means expensive repairs. Conservation rules may also dictate that you must stick to the original material type, so there’s no getting around this.

Structural Movement

Subsidence, or the movement of ground underneath a building, is a real threat to many period homes. In ages past, homes didn’t have the same standards for laying a foundation slab as they do today, and when paired with Cork’s geology, buildings may have shifted quite a lot over time.

This could simply be cosmetic and not a worry, but it could very well be a serious structural defect. You’ll find telltale signs of subsidence such as wall cracks (especially plaster), sloped flooring, or a bowing facade. A competent engineer can tell you how serious the subsidence is and what remediation needs to be done.

Outdated Services

Period homes’ plumbing, electrical, and heating systems are often not up to today’s standard. If the home was lived in over time, owners likely updated or upgraded the system as they went along, but you can never be quite sure without a thorough inspection from an engineer.

Of course, if the home is over 120 years old or so, it wouldn’t have had any electrical systems at all, and its plumbing and heating systems would be considered quite hazardous today. These may all be invisible to the naked eye, but they can nevertheless cost quite a bit to remediate.

Unauthorised Modifications

Over time, previous owners may have slightly or heavily modified the original construction with projects like removing structural (load-bearing) walls, attic conversions, or extensions. These may or may not have been done with proper sign-offs and planning permissions.

Unauthorised modifications can be a real headache to resolve retroactively, and as the owner, you are now responsible for bringing everything up to standard. Consequences of ignoring unauthorised works could include mortgage drawdowns, voided insurance, or failure to secure any further planning applications in the future.

Protected Structures: What Buyers Need to Know

Owing to their historical significance, period homes in Ireland are often (but not always) subjected to additional protections by the local city council. The main protections to be aware of are the Record of Protected Structures (RPS) and Architectural Conservation Areas (ACAs).

For RPS-protected homes and ACA-protected homes alike, homeowners should be aware that the responsible authority in Cork is either Cork City Council (Cork City and suburbs) or Cork County Council (elsewhere in Cork County).

RPS applies to either part of the home or the entire home and its curtilage (all elements found on the property), usually the latter. As a homeowner of an RPS-protected period home in Cork, you’ll need to apply for planning permissions for any major works just like any other homeowner would, but you’ll also need to apply for minor works, all with additional scrutiny. This includes all manner of interior and exterior works. The reason is that the planning authority wants the home to retain its architectural and artistic, historical appeal, so works must be in line with the character of the home.

With ACA protections, an entire street or neighbourhood may fall under a similar type of protection, even if your individual home may not have RPS protection. Cork City has amongst the highest number of ACAs in all of Ireland, around 42 in total, affecting areas such as Washington Street, Blackrock Road, and Douglas Road. For homes within an ACA, the planning authority wants to see the character of that street or neighbourhood conform to its historic and architectural appeal. Like with RPS homes, planning permission is needed for major and minor works, with additional scrutiny.

Under both types of protection status, homes quite often must use original materials such as lime mortar, plaster, natural slate, and lead or copper flashings, all of which tend to cost significantly more than more modern materials. Moreover, these properties are exempt from requiring a BER, so it can be far more challenging to assess the home’s BER rating before purchase.

All in all, there are several constraints on what a homeowner can do with a protected home, but all of these limitations do have practical solutions which you can discuss with a qualified engineer prior to purchase.

What a Pre-Purchase Survey Covers on a Period Property

A growing number of Irish homebuyers are wisely choosing to obtain a pre-purchase survey when buying a second-hand home, or a snag list for a new build. While not a legal requirement, these types of surveys can save prospective homebuyers a lot of headache and unanticipated costs which can easily surpass the cost of the survey in the first place.

For period homes, it is especially important to consider a pre-purchase survey from a qualified engineer, simply due to the huge potential for faults and defects. Remember that a standard mortgage valuation, while useful, isn’t designed to catch the many issues that are common in a period home.

An engineer’s pre-purchase survey will contain a thorough inspection and report covering topics such as the structural integrity of all buildings on the property, damp, evidence of unauthorised modifications or unpermitted works, the condition of the roof, if the building complies to planning records, the condition of any original features or materials, and an itemised list of all desirable and necessary remedial works along with the estimated costs of repairs or renovations.

Settle into History with Peace of Mind with Pre-Purchase Surveys from BCE

Buying a period property in Ireland can appear quite stressful given how much can go wrong, but it’s perfectly feasible and even desirable to own a piece of Cork’s history by living in one, just make sure you do it right! Surely you want to move into your historic home with peace of mind, not headaches and stress just thinking about its faults and defects.

Before you go ahead with buying a period home, make sure you’re getting a pre-purchase survey so that you don’t end up with nasty surprises before you’ve got the house keys in your hand. Arrange for a pre-purchase survey or simply get in touch with us at BCE Consulting before committing to a period property.