Cardiff’s private rented sector is one of the most active in Wales, and with that activity comes a significant and growing set of legal responsibilities. Whether you manage one property in Pontcanna or a portfolio of HMOs across Cathays and Roath, staying compliant in 2026 is not optional — it is the foundation of a profitable, protected lettings business.
The regulatory landscape for Welsh landlords has shifted considerably over the past few years. New financial reporting obligations have come into force, Welsh-specific legislation continues to shape how occupation contracts are structured, and local licensing requirements remain firmly in place. With so much to keep track of, it helps to have everything in one place.
This is your definitive Cardiff landlord compliance checklist for August 2026.
Understanding the Renting Homes (Wales) Act 2016
The Renting Homes (Wales) Act 2016 remains the cornerstone of residential lettings law in Wales. It fundamentally changed the way rented properties are managed, replacing the traditional tenancy framework with a new system of occupation contracts and redefining the relationship between landlords and contract holders.
If you are still referring to the people living in your properties as “tenants,” it is worth updating your language and, more importantly, your paperwork. Under Welsh law, the correct term is contract holder.
Written statements: are yours still compliant?
Every contract holder must receive a written statement of their occupation contract. This document must include all key terms and any additional terms that have been agreed, and it must be issued within 14 days of the occupation date for new contracts.
For landlords in Cardiff’s older housing stock — particularly the Victorian and Edwardian terraces that define Canton and Pontcanna — the fitness for human habitation obligations embedded within the Act deserve particular attention. These properties carry charm and strong rental demand, but they also require diligent maintenance to meet the statutory standards the Act sets out.
Landlords must ensure their properties are fit for human habitation under the Renting Homes (Wales) Act 2016 and comply with specific safety requirements, including smoke alarms, carbon monoxide alarms where required, and electrical safety testing.
Rent Smart Wales: registration and licensing in 2026
Rent Smart Wales continues to be a non-negotiable requirement for all private landlords operating in Wales. If you own a rental property in Cardiff, you must be registered with Rent Smart Wales. If you manage that property yourself, you must also hold a valid landlord licence.
Licences are valid for five years, so if you registered when the scheme launched or renewed in the early 2020s, your renewal window may already be approaching or have passed.
What happens if you are not licensed?
Operating without a valid licence is a criminal offence in Wales. Penalties can include fines, rent stopping orders, and restrictions on your ability to serve a possession notice under the Renting Homes (Wales) Act 2016. For Cardiff landlords managing multiple properties, the reputational and financial consequences of non-compliance can be severe.
Martin & Co Cardiff works with landlords across the city to ensure their Rent Smart Wales obligations are fully met and up to date.
HMO licensing in Cardiff: Cathays, Roath, and beyond
Cardiff has one of the highest concentrations of Houses in Multiple Occupation (HMOs) in Wales, particularly in Cathays and Roath — areas that border Cardiff University and Cardiff Metropolitan University and attract large numbers of student contract holders.
If your property is occupied by five or more people forming more than one household, it is likely subject to mandatory HMO licensing under the Housing Act 2004. Cardiff Council also operates additional licensing schemes in designated areas, which may apply to smaller HMOs.
Landlords with HMOs must ensure they hold the correct licence, meet Cardiff Council’s management standards, and comply with all room size requirements, fire safety provisions, and amenity standards. Failing to licence an HMO can result in unlimited fines and a rent repayment order.
If you are unsure whether your property requires an HMO licence, speaking with a local expert is the most efficient route to clarity.
EPC minimum standards: where do you stand?
All rental properties in Wales must currently hold a valid Energy Performance Certificate (EPC) with a minimum rating of E. Proposed reforms to raise the minimum standard to C have been discussed at both UK and Welsh Government level, and Cardiff landlords with older properties — particularly pre-1919 stock in areas like Grangetown and Splott — should be planning ahead.
Even under the current E minimum, an expired or missing EPC places you in breach of your obligations. EPCs are valid for ten years, so it is worth checking the expiry date on your certificate now, particularly if you have not reviewed it since the property was first let.
Deposit protection: a requirement, not a recommendation
Every security deposit taken from a contract holder in Cardiff must be protected within 30 days of receipt using a government-approved tenancy deposit scheme. The three approved schemes operating in England and Wales are the Deposit Protection Service (DPS), MyDeposits, and the Tenancy Deposit Scheme (TDS).
Prescribed information must also be provided to the contract holder within the same 30-day window.
Failure to protect a deposit correctly can result in a court order requiring you to repay between one and three times the deposit amount. For portfolio landlords managing multiple properties, an unprotected deposit on even a single contract can carry significant financial exposure.
At Martin & Co Cardiff, our managed services include full deposit protection as standard — one less obligation for you to track.
Making Tax Digital for Income Tax: the 1 June 2026 deadline has passed
This is the compliance area that has generated the most questions from Cardiff landlords in recent months, and rightly so. Making Tax Digital for Income Tax became mandatory from 6 April 2026 for qualifying landlords and sole traders whose total gross income from property and self-employment exceeded £50,000 on their 2024/25 tax return.
What does MTD for ITSA mean in practice?
Under MTD for ITSA, landlords with qualifying income must:
Keep digital records of all rental income and allowable expenses using HMRC-compatible software.
Submit quarterly updates to HMRC — four times per year — summarising income and expenditure for each property or property portfolio.
Submit a final declaration at the end of each tax year to confirm the figures and claim any reliefs or allowances.
The quarterly reporting cycle is now live for those who crossed the £50,000 threshold. HMRC has confirmed that the threshold will drop to £30,000 in April 2027, and to £20,000 in April 2028, bringing a significantly larger number of Cardiff landlords into scope over the coming years.
Are you prepared if you are not yet in scope?
Even if your rental income currently falls below £50,000, now is the time to put digital record-keeping systems in place. The transition is far smoother when it is planned rather than rushed. Cardiff landlords with growing portfolios — particularly those acquiring property in up-and-coming areas like Adamsdown, Tremorfa, or the rapidly regenerating Cardiff Bay waterfront — should factor MTD readiness into their expansion plans.
Speaking to a qualified accountant or tax adviser with experience in property income is strongly recommended. Martin & Co Cardiff can connect you with trusted local professionals as part of our commitment to supporting landlords at every stage of their property journey.
Your compliance checklist at a glance
To summarise the key obligations every Cardiff landlord should have confirmed as of August 2026:
Occupation contracts are in place for all contract holders, with written statements issued within 14 days.
Properties meet fitness for human habitation standards under the Renting Homes (Wales) Act 2016, with all required safety measures installed and documented.
Rent Smart Wales registration is current and any self-managing landlord holds a valid licence.
HMO licences are in place where required, including any additional licensing applicable in Cathays, Roath, or other designated Cardiff areas.
EPCs are valid and meet the minimum E rating, with a plan in place for future improvements.
All deposits are protected within 30 days of receipt and prescribed information has been issued to each contract holder.
MTD for ITSA compliance is in place if gross income exceeds £50,000, with quarterly reporting underway and digital records being maintained.
How Martin & Co Cardiff can help
Compliance is not a one-off exercise — it is an ongoing responsibility that evolves with legislation, local licensing decisions, and changes to your portfolio. For Cardiff landlords managing everything from a single flat in Llandaff North to a portfolio of HMOs near the university campus, the administrative burden can quickly become overwhelming.
That is precisely where Martin & Co Cardiff steps in. With over 30 years of experience in residential lettings and a network that manages more than 41,000 properties across the UK, we bring both national expertise and deep local knowledge to every landlord relationship. Our dedicated Cardiff team understands the specific demands of this city’s rental market — from the licensing pressures in Cathays to the older stock obligations in Canton — and we work with you to keep your properties compliant, your contract holders satisfied, and your investment protected.
Our fully managed service covers everything from occupation contract preparation and deposit protection to maintenance coordination and compliance tracking — all with transparent, straightforward fees and no hidden costs. We let 370 new properties every week across the network, and our state-of-the-art contract holder referencing and 24/7 maintenance support mean you can step back with genuine confidence.
Take the next step with confidence
If you are a Cardiff landlord and you are not completely certain that every item on this checklist is covered, now is the right time to act. Compliance gaps do not resolve themselves, and the cost of getting it wrong — financially, legally, and reputationally — is far greater than the cost of getting expert support in place today.
Book a free, no-obligation property valuation with Martin & Co Cardiff and let our local experts give you a clear picture of where your portfolio stands — and how to protect it going forward.
Get in touch with your local Martin & Co Cardiff team today. We are here to simplify your property journey, without any fuss.
