If you are stuck in such a situation, here is what to do.

Mr. Arthur Gable resides in a property in Oakhaven with a particularly narrow driveway running alongside his neighbour’s, Mr. Julian Finch’s, house. The space is already tight, a situation made more challenging after Mr. Finch previously extended a boundary fence, reducing clearance. Mr. Gable now faces a new concern after overhearing Mr. Finch’s plans to install an air conditioning unit on the side wall of his house, directly adjacent to the driveway. He is worried about several potential issues: that the installers may trespass on his driveway to fit the unit, that the unit’s physical presence will further restrict the already limited space needed to open car doors safely for his children, and that the installation might take place while his family is away on holiday, leaving him unable to intervene, a fear based on the previous fence incident. Unsure of the specific type of unit or his legal rights concerning access and permitted development, Mr. Gable seeks to understand his position before approaching his neighbour.

Advice in such cases

Navigating neighbour disputes requires a calm and strategic approach. The primary goal is to resolve the issue amicably while protecting your property rights. Here is a step-by-step guide:

• Consult with Lawyer: The very basic and important step to start is to talk to a Lawyer / Solicitor. You should not hesitate in paying their consultation fee, which might be in the range of £100 to £400, depending on the case. They are helping you in this situation to come out. They are an expert in the domain and can help you explain the procedure which you might have never explored.
• Initiate Dialogue: Before escalating the matter, attempt to have a polite conversation with your neighbour. Express your concerns clearly and calmly. It is possible a mutually agreeable solution can be found, such as repositioning the unit. Follow up any verbal discussion with a written summary via email to create a record.
• Review Property Deeds: Examine your title deeds for any restrictive covenants that may limit or prohibit such alterations. There may also be clauses regarding access rights (easements) over your land, or a lack thereof.
• Understand Planning Law: Familiarise yourself with the ‘permitted development’ rights. In England, The Town and Country Planning (General Permitted Development) (England) Order 2015 allows for the installation of air source heat pumps without full planning permission, but only if strict conditions are met regarding size, noise, and location—including that the unit must be at least one metre from the property boundary.
• Refuse Access: You are under no legal obligation to allow your neighbour or their contractors access to your land to install a new item like an air conditioning unit. You can refuse permission. Access for essential repairs to their property may be sought under the Access to Neighbouring Land Act 1992, but this does not typically cover new installations.
• Document Everything: Take clear, dated photographs and videos of the current state of your driveway and the boundary area before any work commences. This will serve as crucial evidence if damage or trespass occurs.

Applicable Sections of Law

Several key pieces of UK legislation are relevant in this scenario:

• The Town and Country Planning (General Permitted Development) (England) Order 2015: Schedule 2, Part 14, Class G specifically governs the installation of air source heat pumps. It stipulates conditions such as the unit being at least one metre from the boundary, having a volume under 0.6 cubic metres, and complying with MCS Planning Standards, which include a noise limit of 42dB at the nearest neighbouring property. A breach of these conditions means the installation is not permitted development and requires full planning permission.
• The Access to Neighbouring Land Act 1992: This Act allows a person to apply to the court for an access order to enter a neighbour’s land to carry out ‘basic preservation works’ to their own property. It is highly unlikely that a court would grant an order for a new installation like an AC unit, as this is not ‘preservation’. Therefore, without your consent, your neighbour has no right of entry.
• Common Law of Trespass: Any unauthorised entry onto your land, including your driveway, by your neighbour or their contractors constitutes trespass. You can take civil action for this.
• The Party Wall etc. Act 1996: This Act may apply if the installation work involves cutting into the wall on the boundary line (the ‘line of junction’). If applicable, your neighbour must serve you with a formal notice before work begins.
• Common Law of Private Nuisance: If the unit is installed and subsequently creates an unreasonable interference with your enjoyment of your property (e.g., through excessive noise or vibration), you may have grounds for a claim in private nuisance.

If you are the complainant

As the person raising the concern (the complainant), your first step is informal communication. If this fails, you should instruct a solicitor to send a formal letter to your neighbour. This letter should clearly state your legal position regarding trespass, the potential breach of planning regulations, and any relevant property covenants. It should explicitly forbid them and their contractors from entering your property without your written consent. If work begins and involves trespass, you have the right to ask the individuals to leave your land immediately. If there is a clear breach of planning law or a risk of irreparable harm to your property, you can apply to the court for an injunction to stop the work.

If you are the victim

If you are the one being complained about (in this scenario, the neighbour wanting to install the unit), it is your responsibility to ensure the project is lawful. Before proceeding, you must verify that the installation falls under permitted development rights or, if not, that you have obtained the necessary planning permission from the local council. You should also serve any required notices under the Party Wall etc. Act 1996. You must request access to your neighbour’s land formally and in writing, and you cannot proceed without their consent. If they refuse, your only legal recourse is an application under the Access to Neighbouring Land Act 1992, the success of which is not guaranteed for new installations. Do not trespass, as this will expose you to legal action.

How the police behave in such cases

Boundary and planning disputes are civil matters, and the police will not get involved. Their role is to prevent crime and keep the peace. They will not enforce planning rules or mediate property line disagreements. Police may attend a scene if an argument escalates and there is a ‘breach of the peace’ involving threats, aggression, or harassment. If a contractor trespasses on your land and you ask them to leave, the police may attend to prevent a confrontation but will advise you that the trespass itself is a civil issue to be resolved through the courts.

FAQs people normally have

• Can my neighbour install an AC unit right next to my drive?
  
  Under permitted development rules in England, an air conditioning unit (air source heat pump) must be installed at least one metre away from the boundary of your property. If it is closer, it requires full planning permission.
• Do I have to let them onto my property to install it?
  
  No. You have no legal obligation to grant access to your land for a new installation. They must obtain your express, written permission.
• What can I do if they install it while I’m away?
  
  If they trespassed on your property to do so, you could pursue a civil claim. If the installation also breaches planning regulations, you should immediately report it to your local council’s planning enforcement department. Having prior written communication forbidding access strengthens your case significantly.
• What if the unit is noisy once installed?
  
  Permitted development rights for these units include a strict noise limit (42dB at the boundary of the nearest habitable room). If you believe the unit exceeds this, you can complain to the council’s Environmental Health department, who have the power to investigate and take action.

What evidence is required?

• Dated photographs and videos of the boundary area before any work starts.
• A copy of your property’s Title Plan from HM Land Registry to clearly show the boundary line.
• All written correspondence with the neighbour, including emails and copies of any letters sent.
• A detailed log of all events, including dates and times of conversations, sightings of contractors, and any work being done.
• If the dispute concerns noise, a professional acoustic report from a qualified engineer.

How long will the investigation take?

This is not a criminal investigation, so the timeline is dictated by the legal or administrative process you choose. Direct negotiations with your neighbour could resolve the matter in days. A formal process involving solicitors’ letters may take several weeks. If you report a breach to the local council’s planning enforcement or environmental health teams, their investigation can take several weeks or even months to conclude. Pursuing court action, such as an injunction, is the longest path and can take many months to resolve.

Advocate Sudhir Rao, Supreme Court of India