I have always wanted to build my mum a village home.
I am finally ready thanks to bonuses and working hard.I don't have too large of a budget.
The land is in a town near Bondo,We have the land,yet to place a gate,we have ready blueprint for the house done by a pro.It will be a 3 bed roomed bungalow.
1.What is the acceptable % to pay a fundi?
2.Do i need a structural engineer?how much to consult?
3.Start time is May-should we start getting the materials on the ground?
4.Who has contacts of a reputable fundi near Bondo.
5.Any one knows of the closest quary near Akala area.
Any advise,criticisms is welcomed.

Good for you, I am sure your mother will be elated.

As advised above, don't look too far for materials, (but I wouldn't go as far as to use thatched roofing )

Important;
1. Get the right fundi, an idea is to search for one through their Nairobi networks and then you take them to your place to do the work, many are happy to work with modest accomodations as long as the cash is right
2. build in stages, make sure you inspect every stage before starting the other. e,g complete foundation, inspect, then do walls, inspect, then do roof inspect, then interior etc.
3. Ask the fundis for their areas of specialization, example don't accept a fundi claiming he can do both walls and roofing's, you will be in for rude shock. work out labour costs based on stages of work. Avoid fundis of shags if you have high expectations on quality, other than watu wa mkono. If quality is not important then go for them.

Lastly be careful when you are far from home. Trust is an issue that engulfs people in diaspora. Be very very careful

very good thing, you have decided to do, we should always look after our parents.
To be honest mimi sijui Bondo, but I think it should not be that different from other areas,
1. Fundi is more of a willing taker negotiation thing, pay the fundi per day or work based on the local rates
2. in my opinion for a bungalow, an engineer is an overkill.
3. get the materials once you get the main fundi, what I have found better is to accumulate cash and push the project as far as possible in one go.

My advice, get the main fundi first, let him take care of the rest, like sourcing material, getting watu wa mkono, any decent fundi should take care of all stages in a bungalow including roofing and basic finishes, don't stress with experts at each level.

there are other threads on building houses, lakini they are from some years back, weka updates once the project starts, someone else might benefit from that info.

Fundi must never source for material

I would rather fundi akule kidogo and bring in material that you can hold him accountable for than trying to be mjanja then you go get materials that are bad, those guys who sell building material will give you a bad deal if they notice you don't know much.

the problem is, you deliver sand and the fundi tells you haina meno.

Interesting, but what I experienced once was you give a guy cash ya stage he knows that the faster he does it the more cash he will have as profit, so he speeds up the work and does not pay much attention to quality.

fundi are different but, unless you are signing contractual quality assurance documents, I would rather they take longer and do something better than waharakishe and a year down the line you are fixing stuff. Of course there are standard work days for each stage, I would be more concerned knowing work days and paying per day than giving out a contract to local fundis

You have a point, but I doubt materials cost a few hundred bob.. Cement alone could sell at KES 670 in one hardware and KES 780 in another.. And you will not build with 1 bag of cement, rather 100s of bags.. Materials are to be watched like a hawk and buying the material doesn't mean you don't trust that bugger but rather you don't want to tempt

You can do this!
You got plenty of advice on logistics. Mine is a design one. Dunno how old your Mom is, but check plans again to make sure she can live in the house as she ages. some things I have learned with our parents:

1. Steps can become progressively harder to negotiate-leave space for ramps-also forget about sunken living rooms and stairs within the house-not safe

2. Make bathrooms safer..avoid bathtubs(showers better), asian style toilets and install instant hot water if possible, and later gadgets to make toiletting easier-higher toilet seat, bars to hang onto, chair to sit on when bathing etc..

3. You may need larger than standard doors and corridors for wheelchairs..

Anyway...Look up Universal design principles

Good luck..