Scaffolding a house: a step-by-step planning method
The first morning on site shows whether the scaffold was planned or guessed. Two decks short, a ladder bay in front of the front door, ties that will not grip the brick slips: each costs the crew an hour or more. Nearly all of it can be settled beforehand with a tape measure, a sketch and a quiet hour at the desk. The sequence below follows the order an experienced scaffolder works through.
1. Start with the work, not the scaffold
List every trade that will use the scaffold and the order in which they will arrive. A painter, a roofer, a renderer and an electrician fitting one outside light all want different things. Where several trades follow each other, design the scaffold once for the most demanding user instead of altering it half-way through the job.
Then walk slowly around the house and write down everything that gets in the way:
- porches, canopies, balconies, bay windows, conservatories and awnings;
- downpipes, wall lights, satellite dishes, air-conditioning units and letter boxes;
- light wells, cellar hatches, external steps and patio edges;
- shrubs, hedges and flower beds against the wall;
- overhead power or telephone lines and service connections;
- boundaries where the scaffold might have to stand on a neighbour's land or on the pavement.
Do not judge clearances to overhead lines yourself: contact the network operator, who can shroud or isolate them. Standing on a neighbour's land or the public highway needs agreement or a licence well in advance; see scaffolding on a neighbour's land and scaffolding on the pavement or road.
2. Measure every elevation separately
Record length, eaves height, gable height and projections for each side. The scaffold length is the distance the scaffold must cover, not just the wall: where it wraps around a corner, add about one scaffold width; where it stops, plan an end guard rail.
Distinguish two heights. A person works comfortably up to about 2 m above the deck they stand on, so the top deck can sit roughly 2 m below the highest point to be reached. If the scaffold also has to catch a fall from the roof, the top deck must stay close below the eaves edge and a roof edge protection screen goes above it.
Example: a house of 8.5 × 11 m with 5.8 m eaves and a 45° pitched roof, gables on the short sides. Half the width is 4.25 m; at 45° the roof rises the same distance, so the ridge sits at about 10.05 m.
| Elevation | Scaffold length (approx.) | Highest work | Top deck (approx.) |
|---|---|---|---|
| Eaves side, front | 11 m + corners | 5.8 m | about 4 m, or just below eaves for roof work |
| Eaves side, rear | 11 m + corners | 5.8 m | as front |
| Gable, left | 8.5 m | up to 10.05 m | about 8 m in the middle bays |
| Gable, right | 8.5 m | up to 10.05 m | about 8 m in the middle bays |
The gable rarely needs full height over its whole length. The outer bays can stop at eaves level while only the centre bays climb, which saves material but needs side protection at every step. How to turn these figures into square metres is shown in calculating scaffold area.
3. Check the ground
Every standard passes its load through a base jack and base plate into the ground. Concrete or sound paving is rarely a problem; lawns, topsoil and freshly backfilled trenches are. A sole board spreads the load: a base plate of 150 × 150 mm covers 0.0225 m², a timber offcut of 240 × 500 mm underneath covers 0.12 m², more than five times the area. Ground pressure falls to under a fifth, which decides whether a leg sinks after a wet night.
- Slopes: small level differences are taken up by the base jack, within the maximum extension given in the instructions; larger ones need compensation frames or a stepped base.
- Voids: light wells and gratings are not bearing surfaces. Bridge them with beams or lattice girders.
- Water: divert downpipes that discharge onto the scaffold footing before erection.
4. Fix load class, width and wall gap
Painting and inspection usually need load class 2 (1.50 kN/m²); storing render bags, blocks or insulation boards on the deck calls for class 3, rated at 2.00 kN/m². Which class a system reaches at a given bay length is stated in its instructions; background in load classes and width classes. A frame scaffold of 0.73 m system width (width class W06) covers most house work; 1.09 m is more comfortable where material is stacked or people pass each other.
Keep the gap between deck and wall small, typically no more than 300 mm. Larger gaps caused by a roof overhang or thick insulation are bridged with an inside bracket or protected by a guard rail on the wall side. Think ahead to the finished wall: 160 mm of insulation brings the wall 160 mm closer to the deck.
5. Access, entrances and material routes
On houses, access is usually an internal ladder bay with hatch decks: the ladder stands inside the bay and you climb through a trapdoor from lift to lift. For greater heights, longer jobs or larger crews, a stair tower is safer and quicker. Place the access where the ground is firm and level, close to where material is delivered, and not in front of the main door or a much-used window.
If the entrance must stay open, a passage frame leaves clear headroom below the scaffold. Above doors, fit a protective fan or at least a fully boarded deck with toe boards. For tiles, insulation boards or render, a hoist saves a lot of lifting; it needs a base area and a gate in the guard rail at the landing point.
6. Tie plan, parts list and timetable
A facade scaffold does not stand on its own; it is tied to the wall in the pattern set by the manufacturer's instructions. Netting or sheeting acts like a sail and requires more ties. Identify the substrate (solid brick, perforated brick, aerated block, concrete, timber frame or insulated render), mark the tie positions on a facade sketch and check that sound masonry, not a window or a shutter box, sits behind each one. Anchor choice and pull-out tests have their own guide: tying scaffolding to the building.
The parts follow from bays and lifts. For the 11 m eaves side above, with 3.07 m bays, 0.73 m width and three lifts, four bays give 12.28 m, slightly longer than the wall so the scaffold overhangs at the ends:
| Component | Working | Quantity |
|---|---|---|
| Vertical frames | (4 bays + 1) × 3 lifts | 15 |
| Base jacks | 5 frame lines × 2 | 10 |
| Decks (2 per bay at 0.73 m) | 4 × 3 × 2 | 24 |
| Guard rails (top and intermediate) | 4 × 3 × 2 | 24 |
| Toe boards | 4 × 3 | 12 |
| End guard rails | 2 ends × 3 lifts | 6 |
| Guard rail posts, top lift | 4 bays + 1 | 5 |
| Diagonal braces, ties | pattern from the instructions | per plan |
Corners, bracing and the top-lift details follow the instructions; add a few spare couplers, ties and pins. If you prefer not to count, enter the dimensions into the scaffolding calculator.
Finally, order the trades so the scaffold goes up once, is used several times and comes down once: erection and handover inspection, roof and gutters while edge protection is in place, windows, render or insulation from the top down, painting, then sealing of tie holes and dismantling. Leave weather margins. Re-inspect after storms or long breaks. British sites, for instance, work under the Work at Height Regulations 2005, which demand a fresh inspection after anything that could have weakened the structure and never more than a week between routine checks.
Common planning mistakes
- Gable height underestimated because only the eaves were measured.
- Wall gap correct today but too wide after insulation.
- Ladder bay blocking the front door or patio door.
- Tie positions falling on large windows.
- No sole boards on soft ground, so the scaffold settles out of line.
- Components of different systems mixed although they are not approved together.
- Scaffold used before it has been inspected and tagged.
Send your sketch with dimensions and obstacles through the contact form if a bay window, a tall gable or difficult masonry needs a second opinion.