Table of Contents
A farm fence installation in Kenya is a measurement job before it is a building job. The price follows three numbers: the metres of line, the posts that hold it, and the strands that run between them. All three are fixed on the ground, not in an office.
The fence also does more than one task. It marks a boundary, holds stock, keeps animals out of crops and protects equipment. A boundary fence and a paddock fence look alike from the road. They are built to different heights, spacings and wire counts.
First, this page sets out seven decisions in the order a crew meets them: purpose, material, spacing, post depth, wire count, gates and clearing. It covers the fence types, the spacing, the material take-off for a 500 metre run, and the lines every quote should itemise. Also, the wider context on irrigation in Kenya shows where fencing fits into a farm plan.
Four fence jobs, four different fences
The purpose of the farm fence installation decides the material. Start there, before the price per metre.
| Job | Fence that fits | Why |
|---|---|---|
| Perimeter boundary | Four or five strands of barbed or high-tensile wire on timber or steel posts | Taut wire resists cutting and gives a visible line |
| Cattle paddock | Four strands of barbed wire, 1.2 m high | Cattle respect a firm top wire |
| Sheep and goats | Woven mesh 1.2 m to 1.5 m, with one or two top strands | Mesh closes the gaps that small stock push through |
| Pigs | Woven mesh plus a ground-level wire | Pigs root under a fence within days |
| Horses | Smooth high-tensile wire or 2 x 4 inch no-climb mesh | Barbed wire cuts thin-skinned, fast animals |
| Crops and orchards | Mesh 1.2 m to 1.5 m with two top strands | Holds livestock and most wildlife off the crop |
Six fence jobs, and the material each one needs.
Two rules sit behind that table. First, barbed wire contains cattle well and is poor management for horses, because a running horse that meets a barbed strand is easily injured. Second, chain link is uncommon on large areas. It costs more than woven wire, and livestock deform it in small yards.
Similarly, the general reference on agricultural fencing makes the same split. Wire fences are held by tension between braced posts, and the mesh type is chosen by the animal being contained.
Line posts, strainers and the spacing that decides the bill
Every wire fence is a series of bays stretched between braced posts. The braced posts carry the tension. The line posts only keep the wires apart.
In practice, line posts sit 3 m to 6 m apart, depending on the fence style. Braced strainer posts sit at the ends, at every corner, and at intervals on long runs. That interval is often 50 m to 300 m. On a farm in Kenya we tighten it to 100 m to 150 m, because a long bay sags in heat and rubs on the ground.
| Line post spacing | Posts per 100 m | Where it suits |
|---|---|---|
| 3 m | 34 | Cattle, goats, steep ground |
| 3.5 m | 30 | Mixed stock |
| 4 m | 26 | Crop runs on flat ground |
| 5 m | 21 | High-tensile sheep runs on flat ground |
Line posts per 100 metres, counting the post at each end of the run.
The post count is the first place a cheap quote saves money. Moving from 3 m to 4 m spacing removes 8 posts from every 100 m. On 500 m that is 42 fewer posts, and 42 fewer holes to dig.
Then depth follows one rule. Bury one third of the post. A 2.4 m post goes 0.8 m into the ground, and a 3 m post goes 1 m down. A 30 cm hole at 40 cm deep takes about 0.028 cubic metres of concrete. That figure is enough to price a bag count without guessing.
Similarly, steel posts can replace some timber. The common pattern alternates two to five steel posts with one heavier timber post. The timber posts hold the staples and the strain, and the steel posts keep the line straight.
What 500 metres of farm fence installation consumes
For a farm fence installation, a take-off turns a rate per metre into countable items. The table below prices the same 500 m boundary at two spacings, with four strands of wire and three gate openings.
| Item | At 3 m spacing | At 4 m spacing |
|---|---|---|
| Line posts | 168 | 126 |
| Strainer assemblies | 5 | 5 |
| Wire at four strands | 2,000 m | 2,000 m |
| Concrete for line posts | 4.75 m3 | 3.57 m3 |
| Gate openings | 3 | 3 |
The same 500 metre boundary costed at two post spacings.
First, the wire figure is simple. Four strands along 500 m need 2,000 m of wire. Add 5 per cent for ties, overlaps and the run through each strainer, and order 2,100 m.
Also, a strainer assembly is not one post. It is a heavy post, a stay or diagonal, and a ground anchor. That is why five of them matter more than their count suggests. Each one is the point where the wire tension is transferred into the soil.
Finally, gates follow the traffic. We set a 3.6 m opening for tractors and lorries, and a 1.2 m opening for foot traffic. Every gate needs its own heavy post on each side, because a gate post carries the pull of the wire and the swing of the gate.
Wire and mesh types, and what each one will not hold
For a farm fence installation, the material list is short, and each item has a limit worth knowing before it is ordered.
| Material | Specification | Holds | Does not hold |
|---|---|---|---|
| Barbed wire | 12 or 14 gauge, barbs every 10 cm to 20 cm | Cattle | Horses, goats, pigs |
| Woven mesh | 2 x 4 inch no-climb openings | Sheep, goats, pigs, horses | Pressure from a bull |
| High-tensile wire | Wider post spacing, with droppers between posts | Cattle, sheep | Pigs, which root underneath |
| Chain link | Rigid mesh on steel posts | Small yards, stores, equipment | Large areas, livestock pressure |
| Electric wire | One to three wires on insulators | Stock control, temporary divisions | A fence that has lost its earth |
Wire and mesh types, with the animals each one holds.
In practice, barbed wire is made from two twisted wires, usually 12 or 14 gauge, with barbs fixed every 10 cm to 20 cm. A four-strand cattle fence is the working standard. The lowest strand sits within 30 cm of the ground and the top strand at about 1.2 m, which is a benchmark borrowed from the legal fence rules in the western United States and used widely in East Africa.
Meanwhile, woven mesh is the answer for small stock. The 2 x 4 inch no-climb pattern is the safest for horses, because a hoof cannot pass through the opening. Field fence, which has narrow openings at the bottom and wider ones at the top, is a cheaper compromise for cattle and sheep.
In contrast, high-tensile wire behaves differently from mild steel. It springs back when an animal leans on it, and it allows wider post spacing. The trade is that it needs droppers between posts and a strainer that is properly braced.
Electric farm fence installation and the earth stake
An electric fence is a psychological barrier. A charger sends a short pulse along the wire about once per second, at 5 kV to 20 kV. An animal that touches the wire completes the circuit through the ground and learns to stay away.
That sentence holds the design rule. The circuit runs through the soil. Therefore, the earth stakes decide whether the fence works. In dry ground the return path is poor, and a fence that tested well in the workshop will barely tick on the boundary.
For this reason, we set at least three earth stakes in damp ground, spaced along the run, and we test the return before the wire goes up. Vegetation is the other leak. Grass touching a live wire drains the pulse, so the line is cleared along its length and checked after rain.
Also, an electric system needs an energizer rated for the length of wire and the number of strands, insulators on every post, a gate handle at each opening, and a warning sign where people pass. A lightning diverter protects the charger during the long rains.
In practice, electric wire suits paddock divisions and temporary grazing. On a perimeter it works best as a top wire above a physical fence, because a determined thief will test a single strand.
Corners, gates and five places a fence fails
Most fence failures are visible in the first season. They come from five weak points, and each one has a fix at installation time.
- A corner without a stay. Tension pulls the corner post toward the run. A diagonal stay and a ground block carry that load into the soil.
- A strainer in loose soil. A heavy post in soft ground leans within weeks. Set it deeper, or use a larger ground anchor.
- Wire stapled tight at every post. Wire expands and contracts. Staples at line posts should hold it loosely enough to slide, with the tension taken at the strainers.
- A gate post the same size as a line post. The gate post carries the gate plus the wire. It needs a heavier section and its own brace.
- Clearing missed under the bottom wire. Grass hides gaps and drains an electric pulse. A 1 m to 2 m cleared strip also keeps the wire off the ground.
However, two of those points cost nothing extra at installation and everything later. Braced corners and a cleared line are labour, not material. A fence built without them is the one that gets repaired every season.
What a farm fence installation quote should itemise
A farm fence installation quote at a rate per metre is easy to compare and easy to hide behind. Ask for the take-off instead, and compare the two quotes line by line.
A farm fence installation quote worth signing lists eight things:
- The metres of fence line, measured on the ground.
- The post count, with the material and the length of each post.
- The strainer assemblies, with their count and position.
- The wire or mesh, with the strand count, gauge and mesh size.
- The gates, with the width of each opening.
- The clearing and the vegetation strip.
- The transport to site and the labour days.
- The exclusions, written down.
In practice, two quotes for the same boundary can differ by a third. In practice, the difference sits in the post count and the wire gauge. A supplier who cannot name the gauge has priced a drawing, not a fence.
For this reason, we send the take-off with the quote, so the owner can see where the money goes. That also lets a second contractor quote the same specification.
Terrain, soil and the conditions that move the bill
Typically, four site conditions change the material and the labour. All four are visible before the first post goes in.
Soil and posts
First, termites attack untreated timber, and black cotton soil swells and shrinks with the seasons. Either condition pushes the design toward treated timber on concrete, or toward steel posts. Rocky ground does the opposite. It slows the digging and can force a change of line.
Slope and access
In practice, posts go closer together on a slope, because the wire lifts off the ground between high and low points. A steep run at 3 m spacing can need 34 posts per 100 m, against 26 on the flat. Access matters too. A boundary far from the road adds transport on every load of posts and wire.
Rain and clearing
Also, clearing is best done in a dry spell. Wet grass wraps around a brush cutter, and a cleared strip that is not maintained before the long rains disappears by June. The strip is also where the fence is inspected, so its width should suit a person walking the line.
Theft and wildlife
Moreover, a perimeter fence protects pumps, solar panels, tanks and stock. A locked gate and an electric top wire raise the effort for a thief. Wildlife needs a different answer. Woven mesh with a barbed top strand traps animals that cannot jump and cannot crawl through, so the bottom wire is kept tight to the ground and the top strand is left off runs used by wildlife.
Fencing around water, greenhouses and pumps
A farm fence installation often protects equipment that cost more than the fence itself. A pump, a solar array and a greenhouse all sit behind a boundary, and all three are easy to damage or remove.
A borehole drilling in Kenya project ends with a wellhead that needs a locked enclosure. A solar irrigation array needs a mesh fence high enough to stop stock rubbing the panels. A greenhouse construction in Kenya site needs a stock-proof perimeter before the film goes on, because one goat against a polythene wall is an expensive morning.
Water storage follows the same logic. A dam excavation and an irrigation reservoir construction both need a fence at the top of the batter, for safety and for stock control. On lined dams, the dam liner prices in Kenya page explains the material that the fence is protecting.
This is the reason a fence quote is best read beside the rest of the farm plan. The line that protects the pump is not the same line that divides the paddocks, and the two should not share a gate.
Maintenance: the annual walk
A farm fence installation lasts when someone walks it. One inspection a year, after the long rains, catches most faults before they cost a repair.
The walk has four checks. Test the tension at each strainer. Look for leaning posts and lifted staples. Open and close every gate. Clear the strip where grass has grown into the bottom wire.
Therefore, repairs are cheaper in a batch. A loose stay, a lifted staple and a sagging bay are one morning of labour together, and three separate call-outs apart. On an electric fence, test the earth return at the same time, because a dry season can change it.
Finally, record the post count and the wire type when the fence is built. The next repair then needs no measurement, and the next extension starts from a known specification.
Frequently asked questions about farm fence installation
How much does farm fence installation cost per metre in Kenya?
Farm fence installation is quoted from a take-off, not a flat rate. The rate per metre depends on the post count, the wire gauge, the gates and the clearing. At 3 m spacing a 100 m run needs 34 posts; at 4 m it needs 26. Ask any contractor for the post count behind the rate.
How far apart should fence posts be?
Line posts sit 3 m to 6 m apart. Use 3 m for cattle, goats and steep ground, and 4 m to 5 m for crop runs or high-tensile sheep fences on flat land. Strainers go at the ends, at every corner, and every 100 m to 150 m on a long run.
How deep should a fence post be buried?
One third of the post length. A 2.4 m post goes 0.8 m into the ground, and a 3 m post goes 1 m down. Strainer posts go deeper and carry a stay and a ground anchor.
How many strands does a cattle fence need?
Four strands of barbed wire is the working standard, with the lowest within 30 cm of the ground and the top at about 1.2 m. Five strands are used where cattle pressure is high or the boundary is also a security line.
Can barbed wire hold goats?
No. Goats climb and push through barbed strands. Instead, use woven mesh with 2 x 4 inch openings or smaller, at 1.2 m to 1.5 m high.
Why does a corner post need a brace?
The wire pulls the corner toward the run. A diagonal stay transfers that pull to a ground anchor, so the post stays upright. A corner without a brace leans within a season.
Get farm fence installation quoted for your boundary
First, send four things and the quote can be built without a site visit: the length of the boundary, a sketch or map with the gates marked, the stock to be held, and a few photos of the ground. Add the nearest road and the water source, and the transport estimate follows.
Our farm fence installation service covers boundary, paddock, crop and electric fences across Kenya, and we send the take-off with the quote. Call Eunidrip Irrigation Systems on +254 728 163329 or +254 724 775516 to arrange a site measurement.