Do you need a notice for your loft conversion?
It depends on the house and on how the loft is being built.
| Your house | Is a notice likely? |
|---|---|
| Mid-terrace | Yes, usually on both neighbours |
| End of terrace or semi-detached | Yes, on the neighbour you share the wall with |
| Detached | Usually not, because there is no shared wall |
| A flat | Possibly. A floor or ceiling between flats can be a party structure where the flats have separate staircases or entrances. The roof void usually belongs to the freeholder, so your lease matters too |
Why a loft conversion involves the Act
A loft that was built to carry a few tiles and a water tank cannot carry bedroom floors and a staircase. The structural engineer’s design normally adds steel beams, and these have to rest on something. In a terrace or semi, that something is often the party wall. Fitting them means cutting into it.
Work that typically needs a Section 3 party structure notice:
- Steel beams, purlins or a ridge beam bearing in pockets cut into the party wall
- Padstones built into the wall to spread the load
- Raising the party wall or building it up in the roof space, for example to improve fire separation
- Cutting a chase for flashings where a dormer or new roof meets the wall (see roofing work and the Act)
- Changing a shared chimney stack or removing a chimney breast (see chimney breast removal)
Work that on its own usually does not: a new staircase, partition walls inside your own loft, insulation, rooflights in your own roof slope, and a dormer that sits entirely on your own structure.
How much notice
At least two months before work starts. The notice describes the work and the date you intend to begin. It stays valid for 12 months from the day it is served. See how long a party wall notice lasts.
What happens after you serve it
- Each neighbour has 14 days to respond.
- If they consent in writing, you can start once the two months have passed. We recommend a schedule of condition anyway.
- If they dissent, or say nothing, surveyors are appointed and the award is agreed before the work begins. One agreed surveyor for both owners is usually quickest.
- The award records your neighbour’s property, sets out working hours and access, and says what happens if damage occurs.
In our experience the award is normally agreed within the two-month notice period if your neighbour responds promptly. If they are slow, it can run beyond it, which is why you should serve the notice before you book your builder.
Planning and building regulations
Many loft conversions can be built under permitted development, which is a planning rule. It does not remove the need for a party wall notice. Building regulations approval is also required. All three are separate.
Mistakes we see
- Assuming that because the loft is “all in your house” the Act does not apply
- Serving the notice only after the builder has started on the roof
- Forgetting that a mid-terrace has two adjoining owners
- Describing the work as “loft conversion” with no detail on the beams and where they bear
- Letting scaffolding onto a neighbour’s land without asking
What it costs
We prepare and serve the notice for £70, record your neighbour’s property for £350 and act as agreed surveyor for the award from £600. There is no VAT. If you have two neighbours, your written quotation says how that is covered. See our fees.
Send us the structural drawings, or just call 0800 999 1947, and we will tell you which notices apply.
Loft conversion questions
I live in a mid-terrace house. Who do I serve?
Both neighbours, if the beams or other work bear on or cut into both party walls. Each is an adjoining owner and each has their own 14 days to respond. They can respond differently, so one may consent while the other dissents.
Do I need a notice if my loft conversion is only rooflights?
Rooflights in your own roof slope do not need a notice by themselves. If any work cuts into the party wall, raises it, exposes it or changes a shared chimney, a Section 3 notice is needed.
Does my neighbour have to agree to the loft conversion?
No. The Act does not give a neighbour a veto. It decides how the work is done and protects their property. Objections to the development go through planning. See can my neighbour stop my building work?.
Can the scaffolding go up before the notice period ends?
Scaffolding on your own land can, but no work to the party wall can start until the notice period has run and your neighbour has consented or an award has been served. Scaffolding on your neighbour’s land needs their consent or terms in an award.