A 150 x 150 access panel is the smallest standard size we stock, and it exists for one job: covering a single service point that somebody will need to reach again. A stopcock, a radiator or isolator valve, a wiring junction, a thermostat cable, the connection to a shower pump. One item, behind one small door.
The honest way to think about this size is inspection and fingertip access rather than maintenance access. You can see what is behind the lining, get a hand in, turn a valve, put a small spanner on a fitting and check a joint for weeping. You are not going to work two handed through it, and you are not going to lift a component out through it.
That limit is also the attraction. An opening this small takes very little out of a wall or ceiling, it is quick to cut and easy to make good, and once the panel is in place it is a small quiet rectangle on the finish rather than a feature. Where the valve happens to sit in a hallway, a bathroom or a decorated bedroom, that matters more than the extra convenience of a bigger door.
Seven products are listed at this size and every one of them is a metal door. They separate along three questions: what you want to spend, how quickly you want to fit, and whether the wall or ceiling being cut is doing fire compartment work.
Two frame types run through the range. A picture frame sits on the surface of the finished wall and leaves a neat visible border. A beaded frame is set into the plasterboard and finished with scrim tape and skim, so the panel ends up flush in the plaster. Three of the four lines here come in both frames. The exception is the 2hr fire rated panel, which at 150 x 150 is listed in the beaded frame only, so if two hours is specified then the plastering that goes with a beaded frame is part of the decision rather than an option.
If the opening is domestic, needs no rating and simply has to be covered as cheaply as possible, note that plastic access panels are a separate and cheaper family with their own size list.
The lowest cost metal option at this size, for plasterboard openings where nothing is rated and nothing needs locking against the public. A domestic stopcock behind a cupboard or a valve in a utility area is the typical use. Pick the frame on the finish you want rather than on the price.
The same painted metal door supplied as a FlipFix access panel, listed in both frames. Reach for it when fitting time on site is worth more to you than the difference in cost, for example on a repeat item across several plots. It carries no fire rating, so it belongs only in linings where none is called for.
The 60 minute option, and the one most often specified at this size because small service penetrations so often land in compartment construction. A rating is earned by the panel installed in a tested construction rather than by the door on its own, so where the job needs evidence, ask for the documentation covering the exact line. See also fire rated access panels.
The single 120 minute product at 150 x 150, and it comes in the beaded frame alone. That settles the frame question for you: allow for scrim tape, plaster and a second visit to finish. Two hours in a surface mounted picture frame is not a combination listed at this size, so raise it with us before you order rather than after.
Three dimensions matter here and they are not the same number. There is the panel size, which is what the product is called. There is the structural opening, the hole cut in the board, set out slightly larger than the panel so the frame can be adjusted. And there is the clear opening you genuinely reach through once the frame and the hinge have taken their share, which is smaller than both. Take that figure from the product page for the line you are buying rather than assuming it is 150 by 150.
In practice a hand and a small spanner go through a panel this size. A full valve assembly, a manifold, a pump or anything that has to be withdrawn does not. Where the component may one day be replaced rather than merely looked at, size the opening for the replacement.
Two situations rule the size out. The first is any task needing both hands or a forearm inside the wall. The second is access where a minimum opening is set by regulation or by the equipment manufacturer, gas flue inspection being the example that comes up most. That figure comes from the guidance applying to the installation, not from the smallest panel that will cover the hole, so confirm it before ordering. If either applies, move up the ladder at access panels by size, where the large square sizes such as 550 x 550 access panels sit, or order a made to measure access panel where the opening is not a stock size.
Before anything is cut, work out what sits behind the board. At this size the position is usually dictated by the service itself, but a stud or a joist immediately behind the mark will move the whole panel whether you want it to or not. Establish that first, then set the opening out.
The two frames then give you two different days’ work. A picture frame is fixed and finished in one visit, with the border sitting on the wall surface and decoration around it the only follow on. A beaded frame is a two stage job: the frame goes in, then it is scrimmed and plastered like any other board joint, and the finish is only flush once that has dried and been decorated. Price the plasterer in before choosing it for one small panel in an occupied room.
Whichever you fit, follow the instructions supplied with that panel rather than carrying over a method from a larger size. On a fire rated panel this matters more than anywhere else, because how the panel is fitted is part of what the rating depends on.
